Weight Conversion   | Kilogram (kg) → Gram (g)

Supported Units

Name	Description	Conversions
Quectogram (qg)	The Quectogram (qg) is an extremely small unit of mass in the metric system, part of the International System of Units(SI). It is equal to 10-30 grams or one nonillionth of a gram Conversions: 1 quectogram (qg) = 10-30 grams Features: The prefix "quecto-" represents 10-30 Common Uses: The quectogram is not commonly used in everyday measurements but may be relevant in fields like quantum physics, cosmology or nanotechnology, where extremely small masses are involved.	1 qg = 1e-3 rg 1 qg = 1e-6 yg 1 qg = 1e-9 zg 1 qg = 1e-12 ag 1 qg = 1e-15 fg 1 qg = 1e-18 pg 1 qg = 1e-21 ng 1 qg = 1e-24 μg 1 qg = 1e-27 mg 1 qg = 1e-28 cg 1 qg = 1e-29 dg 1 qg = 1e-30 g 1 qg = 1e-31 dag 1 qg = 1e-32 hg 1 qg = 1e-33 kg 1 qg = 1e-36 Mg 1 qg = 1e-39 Gg 1 qg = 1e-42 Tg 1 qg = 1e-45 Pg 1 qg = 1e-48 Eg 1 qg = 1e-51 Zg 1 qg = 1e-54 Yg 1 qg = 1e-57 Rg 1 qg = 1e-60 Qg 1 qg = 3.527396e-32 oz 1 qg = 2.204623e-33 lb 1 qg = 1.57473e-34 st 1 qg = 1.102311e-36 short ton 1 qg = 9.842065e-37 Long ton
Rontogram (rg)	The Rontogram (rg) is a very small unit of mass in the metric system, part of the International System of Units (SI), introduced with the "ronto-" prefix to represent extremely small quantities. Conversions: 1 rontogram (rg) = 10-27 grams (one octillionth of a gram) Features: The prefix "ronto-" represents 10-27 Common Uses: Rontogram is mainly used in highly specialized scientific fields like quantum physics, particle physics or nanotechnology, where measuring ultra-small masses or particles is required.	1 rg = 1e+3 qg 1 rg = 1e-3 yg 1 rg = 1e-6 zg 1 rg = 1e-9 ag 1 rg = 1e-12 fg 1 rg = 1e-15 pg 1 rg = 1e-18 ng 1 rg = 1e-21 μg 1 rg = 1e-24 mg 1 rg = 1e-25 cg 1 rg = 1e-26 dg 1 rg = 1e-27 g 1 rg = 1e-28 dag 1 rg = 1e-29 hg 1 rg = 1e-30 kg 1 rg = 1e-33 Mg 1 rg = 1e-36 Gg 1 rg = 1e-39 Tg 1 rg = 1e-42 Pg 1 rg = 1e-45 Eg 1 rg = 1e-48 Zg 1 rg = 1e-51 Yg 1 rg = 1e-54 Rg 1 rg = 1e-57 Qg 1 rg = 3.527396e-29 oz 1 rg = 2.204623e-30 lb 1 rg = 1.57473e-31 st 1 rg = 1.102311e-33 short ton 1 rg = 9.842065e-34 Long ton
Yoctogram (yg)	The Yoctogram (yg) is an extremely small unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 yoctogram (yg) = 10-24 grams (one septillionth of a gram) Features: The prefix "yocto-" represents 10-24 Common Uses: Yoctogram is not commonly used in everyday measurements, but it may be relevant in advanced scientific fields like particle physics, cosmology or quantum mechanics, where such small quantities are needed to describe masses of particles or phenomena at microscopic scales.	1 yg = 1e+6 qg 1 yg = 1e+3 rg 1 yg = 1e-3 zg 1 yg = 1e-6 ag 1 yg = 1e-9 fg 1 yg = 1e-12 pg 1 yg = 1e-15 ng 1 yg = 1e-18 μg 1 yg = 1e-21 mg 1 yg = 1e-22 cg 1 yg = 1e-23 dg 1 yg = 1e-24 g 1 yg = 1e-25 dag 1 yg = 1e-26 hg 1 yg = 1e-27 kg 1 yg = 1e-30 Mg 1 yg = 1e-33 Gg 1 yg = 1e-36 Tg 1 yg = 1e-39 Pg 1 yg = 1e-42 Eg 1 yg = 1e-45 Zg 1 yg = 1e-48 Yg 1 yg = 1e-51 Rg 1 yg = 1e-54 Qg 1 yg = 3.527396e-26 oz 1 yg = 2.204623e-27 lb 1 yg = 1.57473e-28 st 1 yg = 1.102311e-30 short ton 1 yg = 9.842065e-31 Long ton
Zeptogram (zg)	The Zeptogram (zg) is an extremely small unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 zeptogram (zg) = 10-21 grams (one sextillionth of a gram) Features: The prefix "zepto-" represents 10-21 Common Uses: Zeptogram is not used in everyday measurements but can be applied in fields like nanotechnology, particle physics and biotechnology, where measurements of very small masses are required.	1 zg = 1e+9 qg 1 zg = 1e+6 rg 1 zg = 1e+3 yg 1 zg = 1e-3 ag 1 zg = 1e-6 fg 1 zg = 1e-9 pg 1 zg = 1e-12 ng 1 zg = 1e-15 μg 1 zg = 1e-18 mg 1 zg = 1e-19 cg 1 zg = 1e-20 dg 1 zg = 1e-21 g 1 zg = 1e-22 dag 1 zg = 1e-23 hg 1 zg = 1e-24 kg 1 zg = 1e-27 Mg 1 zg = 1e-30 Gg 1 zg = 1e-33 Tg 1 zg = 1e-36 Pg 1 zg = 1e-39 Eg 1 zg = 1e-42 Zg 1 zg = 1e-45 Yg 1 zg = 1e-48 Rg 1 zg = 1e-51 Qg 1 zg = 3.527396e-23 oz 1 zg = 2.204623e-24 lb 1 zg = 1.57473e-25 st 1 zg = 1.102311e-27 short ton 1 zg = 9.842065e-28 Long ton
Attogram (ag)	The Attogram (ag) is a very small unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 attogram (ag) = 10-18 grams (one quintillionth of a gram) Features: The prefix "atto-" represents 10-18 Common Uses: Attogram is used in highly specialized scientific fields like nanotechnology, biotechnology, molecular biology and particle physics, where precise measurements of very small masses are required.	1 ag = 1e+12 qg 1 ag = 1e+9 rg 1 ag = 1e+6 yg 1 ag = 1e+3 zg 1 ag = 1e-3 fg 1 ag = 1e-6 pg 1 ag = 1e-9 ng 1 ag = 1e-12 μg 1 ag = 1e-15 mg 1 ag = 1e-16 cg 1 ag = 1e-17 dg 1 ag = 1e-18 g 1 ag = 1e-19 dag 1 ag = 1e-20 hg 1 ag = 1e-21 kg 1 ag = 1e-24 Mg 1 ag = 1e-27 Gg 1 ag = 1e-30 Tg 1 ag = 1e-33 Pg 1 ag = 1e-36 Eg 1 ag = 1e-39 Zg 1 ag = 1e-42 Yg 1 ag = 1e-45 Rg 1 ag = 1e-48 Qg 1 ag = 3.527396e-20 oz 1 ag = 2.204623e-21 lb 1 ag = 1.57473e-22 st 1 ag = 1.102311e-24 short ton 1 ag = 9.842065e-25 Long ton
Femtogram (fg)	The Femtogram (fg) is a small unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 femtogram (fg) = 10-15 grams (one quadrillionth of a gram) Features: The prefix "femto-" represents 10-15 Common Uses: Femtogram is used in highly specialized scientific fields where precise measurements of very tiny masses are needed, such as in molecular biology (e.g., measuring the mass of individual molecules), genetics and chemical analysis.	1 fg = 1e+15 qg 1 fg = 1e+12 rg 1 fg = 1e+9 yg 1 fg = 1e+6 zg 1 fg = 1e+3 ag 1 fg = 1e-3 pg 1 fg = 1e-6 ng 1 fg = 1e-9 μg 1 fg = 1e-12 mg 1 fg = 1e-13 cg 1 fg = 1e-14 dg 1 fg = 1e-15 g 1 fg = 1e-16 dag 1 fg = 1e-17 hg 1 fg = 1e-18 kg 1 fg = 1e-21 Mg 1 fg = 1e-24 Gg 1 fg = 1e-27 Tg 1 fg = 1e-30 Pg 1 fg = 1e-33 Eg 1 fg = 1e-36 Zg 1 fg = 1e-39 Yg 1 fg = 1e-42 Rg 1 fg = 1e-45 Qg 1 fg = 3.527396e-17 oz 1 fg = 2.204623e-18 lb 1 fg = 1.57473e-19 st 1 fg = 1.102311e-21 short ton 1 fg = 9.842065e-22 Long ton
Picogram (pg)	The Picogram (pg) is a very small unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 picogram (pg) = 10-12 grams (one trillionth of a gram) Features: The prefix "pico-" represents 10-12 Common Uses: Picogram is commonly used in fields like biotechnology, chemistry, medicine and environmental science, where precise measurements of small quantities are needed. It is useful for measuring molecular weights, pharmaceutical dosages and trace amounts of substances in scientific research.	1 pg = 1e+18 qg 1 pg = 1e+15 rg 1 pg = 1e+12 yg 1 pg = 1e+9 zg 1 pg = 1e+6 ag 1 pg = 1e+3 fg 1 pg = 1e-3 ng 1 pg = 1e-6 μg 1 pg = 1e-9 mg 1 pg = 1e-10 cg 1 pg = 1e-11 dg 1 pg = 1e-12 g 1 pg = 1e-13 dag 1 pg = 1e-14 hg 1 pg = 1e-15 kg 1 pg = 1e-18 Mg 1 pg = 1e-21 Gg 1 pg = 1e-24 Tg 1 pg = 1e-27 Pg 1 pg = 1e-30 Eg 1 pg = 1e-33 Zg 1 pg = 1e-36 Yg 1 pg = 1e-39 Rg 1 pg = 1e-42 Qg 1 pg = 3.527396e-14 oz 1 pg = 2.204623e-15 lb 1 pg = 1.57473e-16 st 1 pg = 1.102311e-18 short ton 1 pg = 9.842065e-19 Long ton
Nanogram (ng)	The Nanogram (ng) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 nanogram (ng) = 10-9 grams (one billionth of a gram) Features: The prefix "nano-" represents 10-9 Common Uses: Nanogram is frequently used in fields like biotechnology, pharmaceuticals, environmental science and chemistry, where precise measurements of small amounts are required. It is useful for measuring molecular weights, drug dosages or trace amounts of substances in scientific research and industry.	1 ng = 1e+21 qg 1 ng = 1e+18 rg 1 ng = 1e+15 yg 1 ng = 1e+12 zg 1 ng = 1e+9 ag 1 ng = 1e+6 fg 1 ng = 1e+3 pg 1 ng = 1e-3 μg 1 ng = 1e-6 mg 1 ng = 1e-7 cg 1 ng = 1e-8 dg 1 ng = 1e-9 g 1 ng = 1e-10 dag 1 ng = 1e-11 hg 1 ng = 1e-12 kg 1 ng = 1e-15 Mg 1 ng = 1e-18 Gg 1 ng = 1e-21 Tg 1 ng = 1e-24 Pg 1 ng = 1e-27 Eg 1 ng = 1e-30 Zg 1 ng = 1e-33 Yg 1 ng = 1e-36 Rg 1 ng = 1e-39 Qg 1 ng = 3.527396e-11 oz 1 ng = 2.204623e-12 lb 1 ng = 1.57473e-13 st 1 ng = 1.102311e-15 short ton 1 ng = 9.842065e-16 Long ton
Microgram (μg)	The Microgram (μg) is a small unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 microgram (µg) = 10-6 grams (one millionth of a gram) Features: The prefix "micro-" represents 10-6 Common Uses: Microgram is commonly used in fields like medicine, pharmaceuticals, biology, environmental science and chemistry, where accurate measurement of small amounts is essential. It is often used to measure drug dosages, nutrient concentrations, pollutants and other substances at microscopic levels.	1 μg = 1e+24 qg 1 μg = 1e+21 rg 1 μg = 1e+18 yg 1 μg = 1e+15 zg 1 μg = 1e+12 ag 1 μg = 1e+9 fg 1 μg = 1e+6 pg 1 μg = 1e+3 ng 1 μg = 1e-3 mg 1 μg = 1e-4 cg 1 μg = 1e-5 dg 1 μg = 1e-6 g 1 μg = 1e-7 dag 1 μg = 1e-8 hg 1 μg = 1e-9 kg 1 μg = 1e-12 Mg 1 μg = 1e-15 Gg 1 μg = 1e-18 Tg 1 μg = 1e-21 Pg 1 μg = 1e-24 Eg 1 μg = 1e-27 Zg 1 μg = 1e-30 Yg 1 μg = 1e-33 Rg 1 μg = 1e-36 Qg 1 μg = 3.527396e-8 oz 1 μg = 2.204623e-9 lb 1 μg = 1.57473e-10 st 1 μg = 1.102311e-12 short ton 1 μg = 9.842065e-13 Long ton
Milligram (mg)	The Milligram (mg) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 milligram (mg) = 10-3 grams (one thousandth of a gram) Features: The prefix "milli-" represents 10-3 Common Uses: Milligram is widely used in medicine, pharmaceuticals, chemistry and nutrition, where precise measurements of small quantities of substances are essential. It is commonly used for measuring drug dosages, nutrient content in food, cosmetic products and laboratory chemicals.	1 mg = 1e+27 qg 1 mg = 1e+24 rg 1 mg = 1e+21 yg 1 mg = 1e+18 zg 1 mg = 1e+15 ag 1 mg = 1e+12 fg 1 mg = 1e+9 pg 1 mg = 1e+6 ng 1 mg = 1e+3 μg 1 mg = 1e-1 cg 1 mg = 1e-2 dg 1 mg = 1e-3 g 1 mg = 1e-4 dag 1 mg = 1e-5 hg 1 mg = 1e-6 kg 1 mg = 1e-9 Mg 1 mg = 1e-12 Gg 1 mg = 1e-15 Tg 1 mg = 1e-18 Pg 1 mg = 1e-21 Eg 1 mg = 1e-24 Zg 1 mg = 1e-27 Yg 1 mg = 1e-30 Rg 1 mg = 1e-33 Qg 1 mg = 3.527396e-5 oz 1 mg = 2.204623e-6 lb 1 mg = 1.57473e-7 st 1 mg = 1.102311e-9 short ton 1 mg = 9.842065e-10 Long ton
Centigram (cg)	The Centigram (cg) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 centigram (cg) = 10-2 grams (one hundredth of a gram) Features: The prefix "centi-" represents 10-2 Common Uses: Centigram is used in fields like chemistry, pharmacy and food science, where precision in measuring small masses is needed but a gram might be too large. It is sometimes used to measure small amounts of ingredients, medications or chemical compounds.	1 cg = 1e+28 qg 1 cg = 1e+25 rg 1 cg = 1e+22 yg 1 cg = 1e+19 zg 1 cg = 1e+16 ag 1 cg = 1e+13 fg 1 cg = 1e+10 pg 1 cg = 1e+7 ng 1 cg = 1e+4 μg 1 cg = 1e+1 mg 1 cg = 1e-1 dg 1 cg = 1e-2 g 1 cg = 1e-3 dag 1 cg = 1e-4 hg 1 cg = 1e-5 kg 1 cg = 1e-8 Mg 1 cg = 1e-11 Gg 1 cg = 1e-14 Tg 1 cg = 1e-17 Pg 1 cg = 1e-20 Eg 1 cg = 1e-23 Zg 1 cg = 1e-26 Yg 1 cg = 1e-29 Rg 1 cg = 1e-32 Qg 1 cg = 3.527396e-4 oz 1 cg = 2.204623e-5 lb 1 cg = 1.57473e-6 st 1 cg = 1.102311e-8 short ton 1 cg = 9.842065e-9 Long ton
Decigram (dg)	The Decigram (dg) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 decigram (dg) = 10-1 grams (one tenth of a gram) Features: The prefix "deci-" represents 10-1 Common Uses: Decigram is used in fields like pharmacy, chemistry and food science, where precision in measuring small masses is needed, but a gram is too large. It can be used to measure small dosages of medication, ingredients in recipes or small quantities of chemicals in laboratories.	1 dg = 1e+29 qg 1 dg = 1e+26 rg 1 dg = 1e+23 yg 1 dg = 1e+20 zg 1 dg = 1e+17 ag 1 dg = 1e+14 fg 1 dg = 1e+11 pg 1 dg = 1e+8 ng 1 dg = 1e+5 μg 1 dg = 1e+2 mg 1 dg = 1e+1 cg 1 dg = 1e-1 g 1 dg = 1e-2 dag 1 dg = 1e-3 hg 1 dg = 1e-4 kg 1 dg = 1e-7 Mg 1 dg = 1e-10 Gg 1 dg = 1e-13 Tg 1 dg = 1e-16 Pg 1 dg = 1e-19 Eg 1 dg = 1e-22 Zg 1 dg = 1e-25 Yg 1 dg = 1e-28 Rg 1 dg = 1e-31 Qg 1 dg = 3.527396e-3 oz 1 dg = 2.204623e-4 lb 1 dg = 1.57473e-5 st 1 dg = 1.102311e-7 short ton 1 dg = 9.842065e-8 Long ton
Gram (g)	The Gram (g) is the basic unit of mass in the metric system and part of the International System of Units (SI). Conversions: 1 gram (g) = 100 grams (the base unit of mass in the metric system) Common Uses: Gram is commonly used in everyday life (e.g., food packaging, body weight). It is the standard unit for measuring ingredients in cooking, medications and small scientific samples.	1 g = 1e+30 qg 1 g = 1e+27 rg 1 g = 1e+24 yg 1 g = 1e+21 zg 1 g = 1e+18 ag 1 g = 1e+15 fg 1 g = 1e+12 pg 1 g = 1e+9 ng 1 g = 1e+6 μg 1 g = 1e+3 mg 1 g = 1e+2 cg 1 g = 1e+1 dg 1 g = 1e-1 dag 1 g = 1e-2 hg 1 g = 1e-3 kg 1 g = 1e-6 Mg 1 g = 1e-9 Gg 1 g = 1e-12 Tg 1 g = 1e-15 Pg 1 g = 1e-18 Eg 1 g = 1e-21 Zg 1 g = 1e-24 Yg 1 g = 1e-27 Rg 1 g = 1e-30 Qg 1 g = 3.527396e-2 oz 1 g = 2.204623e-3 lb 1 g = 1.57473e-4 st 1 g = 1.102311e-6 short ton 1 g = 9.842065e-7 Long ton
Decagram (dag)	The Decagram (dag) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 decagram (dag) = 10 grams (ten grams) Features: The prefix "deca-" represents 10 Common Uses: Decagram is used in fields like nutrition, pharmacy and cooking, where moderate quantities of substances need to be measured. It is often used to measure food ingredients, medication dosages and chemical substances in certain scientific applications.	1 dag = 1e+31 qg 1 dag = 1e+28 rg 1 dag = 1e+25 yg 1 dag = 1e+22 zg 1 dag = 1e+19 ag 1 dag = 1e+16 fg 1 dag = 1e+13 pg 1 dag = 1e+10 ng 1 dag = 1e+7 μg 1 dag = 1e+4 mg 1 dag = 1e+3 cg 1 dag = 1e+2 dg 1 dag = 1e+1 g 1 dag = 1e-1 hg 1 dag = 1e-2 kg 1 dag = 1e-5 Mg 1 dag = 1e-8 Gg 1 dag = 1e-11 Tg 1 dag = 1e-14 Pg 1 dag = 1e-17 Eg 1 dag = 1e-20 Zg 1 dag = 1e-23 Yg 1 dag = 1e-26 Rg 1 dag = 1e-29 Qg 1 dag = 3.527396e-1 oz 1 dag = 2.204623e-2 lb 1 dag = 1.57473e-3 st 1 dag = 1.102311e-5 short ton 1 dag = 9.842065e-6 Long ton
Hectogram (hg)	The Hectogram (hg) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 hectogram (hg) = 100 grams (one hundred grams) Features: The prefix "hecto-" represents 102 Common Uses: Hectogram is commonly used in fields like nutrition, agriculture and food science, where medium-sized quantities of substances are measured. It is often used in packaging food products, measuring portions and scientific experiments where larger quantities of material are involved.	1 hg = 1e+32 qg 1 hg = 1e+29 rg 1 hg = 1e+26 yg 1 hg = 1e+23 zg 1 hg = 1e+20 ag 1 hg = 1e+17 fg 1 hg = 1e+14 pg 1 hg = 1e+11 ng 1 hg = 1e+8 μg 1 hg = 1e+5 mg 1 hg = 1e+4 cg 1 hg = 1e+3 dg 1 hg = 1e+2 g 1 hg = 1e+1 dag 1 hg = 1e-1 kg 1 hg = 1e-4 Mg 1 hg = 1e-7 Gg 1 hg = 1e-10 Tg 1 hg = 1e-13 Pg 1 hg = 1e-16 Eg 1 hg = 1e-19 Zg 1 hg = 1e-22 Yg 1 hg = 1e-25 Rg 1 hg = 1e-28 Qg 1 hg = 3.527396e+0 oz 1 hg = 2.204623e-1 lb 1 hg = 1.57473e-2 st 1 hg = 1.102311e-4 short ton 1 hg = 9.842065e-5 Long ton
Kilogram (kg)	The Kilogram (kg) is the base unit of mass in the metric system and part of the International System of Units (SI). Conversions: 1 kilogram (kg) = 1,000 grams (one thousand grams) Features: The prefix "kilo-" represents 103 Common Uses: Kilogram is used for measuring the mass of people, animals, food and many other everyday objects. It is the standard unit in science, engineering and commerce for measuring weight or mass.	1 kg = 1e+33 qg 1 kg = 1e+30 rg 1 kg = 1e+27 yg 1 kg = 1e+24 zg 1 kg = 1e+21 ag 1 kg = 1e+18 fg 1 kg = 1e+15 pg 1 kg = 1e+12 ng 1 kg = 1e+9 μg 1 kg = 1e+6 mg 1 kg = 1e+5 cg 1 kg = 1e+4 dg 1 kg = 1e+3 g 1 kg = 1e+2 dag 1 kg = 1e+1 hg 1 kg = 1e-3 Mg 1 kg = 1e-6 Gg 1 kg = 1e-9 Tg 1 kg = 1e-12 Pg 1 kg = 1e-15 Eg 1 kg = 1e-18 Zg 1 kg = 1e-21 Yg 1 kg = 1e-24 Rg 1 kg = 1e-27 Qg 1 kg = 3.527396e+1 oz 1 kg = 2.204623e+0 lb 1 kg = 1.57473e-1 st 1 kg = 1.102311e-3 short ton 1 kg = 9.842065e-4 Long ton
Tonne /megagram/ (Mg)	The Tonne /megagram/ (Mg) , also known as a metric ton, is a unit of mass in the metric system and part of the International System of Units (SI). Conversions: 1 tonne (t) = 1,000 kilograms (kg) (one thousand kilograms) Common Uses: Tonne is frequently used in shipping, construction, transportation and agriculture for measuring large masses or quantities, such as cargo, vehicles or natural resources (e.g., coal, grain, etc.).	1 Mg = 1e+36 qg 1 Mg = 1e+33 rg 1 Mg = 1e+30 yg 1 Mg = 1e+27 zg 1 Mg = 1e+24 ag 1 Mg = 1e+21 fg 1 Mg = 1e+18 pg 1 Mg = 1e+15 ng 1 Mg = 1e+12 μg 1 Mg = 1e+9 mg 1 Mg = 1e+8 cg 1 Mg = 1e+7 dg 1 Mg = 1e+6 g 1 Mg = 1e+5 dag 1 Mg = 1e+4 hg 1 Mg = 1e+3 kg 1 Mg = 1e-3 Gg 1 Mg = 1e-6 Tg 1 Mg = 1e-9 Pg 1 Mg = 1e-12 Eg 1 Mg = 1e-15 Zg 1 Mg = 1e-18 Yg 1 Mg = 1e-21 Rg 1 Mg = 1e-24 Qg 1 Mg = 3.527396e+4 oz 1 Mg = 2.204623e+3 lb 1 Mg = 1.57473e+2 st 1 Mg = 1.102311e+0 short ton 1 Mg = 9.842065e-1 Long ton
Gigagram (Gg)	The Gigagram (Gg) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 gigagram (Gg) = 1,000,000 kilograms (kg) = 109 grams Features: The prefix "giga-" represents 109 (one billion) Common Uses: Gigagram is commonly used in environmental science, industry and geology to measure large quantities of mass, such as the weight of materials, large shipments or natural phenomena (e.g., the mass of air pollutants or waste).	1 Gg = 1e+39 qg 1 Gg = 1e+36 rg 1 Gg = 1e+33 yg 1 Gg = 1e+30 zg 1 Gg = 1e+27 ag 1 Gg = 1e+24 fg 1 Gg = 1e+21 pg 1 Gg = 1e+18 ng 1 Gg = 1e+15 μg 1 Gg = 1e+12 mg 1 Gg = 1e+11 cg 1 Gg = 1e+10 dg 1 Gg = 1e+9 g 1 Gg = 1e+8 dag 1 Gg = 1e+7 hg 1 Gg = 1e+6 kg 1 Gg = 1e+3 Mg 1 Gg = 1e-3 Tg 1 Gg = 1e-6 Pg 1 Gg = 1e-9 Eg 1 Gg = 1e-12 Zg 1 Gg = 1e-15 Yg 1 Gg = 1e-18 Rg 1 Gg = 1e-21 Qg 1 Gg = 3.527396e+7 oz 1 Gg = 2.204623e+6 lb 1 Gg = 1.57473e+5 st 1 Gg = 1.102311e+3 short ton 1 Gg = 9.842065e+2 Long ton
Teragram (Tg)	The Teragram (Tg) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 teragram (Tg) = 1,000,000,000 kilograms (kg) = 1012 grams (one trillion grams) Features: The prefix "tera-" represents 1012 (one trillion) Common Uses: Teragram is commonly used in environmental science, geology and large-scale industry, such as measuring global carbon emissions, mass of natural resources or the total mass of large ecosystems (e.g., forests, oceans).	1 Tg = 1e+42 qg 1 Tg = 1e+39 rg 1 Tg = 1e+36 yg 1 Tg = 1e+33 zg 1 Tg = 1e+30 ag 1 Tg = 1e+27 fg 1 Tg = 1e+24 pg 1 Tg = 1e+21 ng 1 Tg = 1e+18 μg 1 Tg = 1e+15 mg 1 Tg = 1e+14 cg 1 Tg = 1e+13 dg 1 Tg = 1e+12 g 1 Tg = 1e+11 dag 1 Tg = 1e+10 hg 1 Tg = 1e+9 kg 1 Tg = 1e+6 Mg 1 Tg = 1e+3 Gg 1 Tg = 1e-3 Pg 1 Tg = 1e-6 Eg 1 Tg = 1e-9 Zg 1 Tg = 1e-12 Yg 1 Tg = 1e-15 Rg 1 Tg = 1e-18 Qg 1 Tg = 3.527396e+10 oz 1 Tg = 2.204623e+9 lb 1 Tg = 1.57473e+8 st 1 Tg = 1.102311e+6 short ton 1 Tg = 9.842065e+5 Long ton
Petagram (Pg)	The Petagram (Pg) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 petagram (Pg) = 1,000,000,000,000 kilograms (kg) = 1015 grams (one quadrillion grams) Features: The prefix "peta-" represents 1015 (one quadrillion) Common Uses: Petagram is commonly used in fields like environmental science, geology and climate science for measuring global carbon emissions, the mass of Earth's atmosphere or large-scale biospheric processes.	1 Pg = 1e+45 qg 1 Pg = 1e+42 rg 1 Pg = 1e+39 yg 1 Pg = 1e+36 zg 1 Pg = 1e+33 ag 1 Pg = 1e+30 fg 1 Pg = 1e+27 pg 1 Pg = 1e+24 ng 1 Pg = 1e+21 μg 1 Pg = 1e+18 mg 1 Pg = 1e+17 cg 1 Pg = 1e+16 dg 1 Pg = 1e+15 g 1 Pg = 1e+14 dag 1 Pg = 1e+13 hg 1 Pg = 1e+12 kg 1 Pg = 1e+9 Mg 1 Pg = 1e+6 Gg 1 Pg = 1e+3 Tg 1 Pg = 1e-3 Eg 1 Pg = 1e-6 Zg 1 Pg = 1e-9 Yg 1 Pg = 1e-12 Rg 1 Pg = 1e-15 Qg 1 Pg = 3.527396e+13 oz 1 Pg = 2.204623e+12 lb 1 Pg = 1.57473e+11 st 1 Pg = 1.102311e+9 short ton 1 Pg = 9.842065e+8 Long ton
Exagram (Eg)	The Exagram (Eg) is a unit of mass in the metric system, part of the International System o Units (SI). Conversions: 1 exagram (Eg) = 1,000,000,000,000,000 kilograms (kg) = 1018 grams (one quintillion grams) Features: The prefix "exa-" represents 1018 (one quintillion) Common Uses: Exagram is typically used in fields like planetary science, climate science and geophysics, for measuring the mass of the Earth, large-scale mass flows or global-scale environmental processes.	1 Eg = 1e+48 qg 1 Eg = 1e+45 rg 1 Eg = 1e+42 yg 1 Eg = 1e+39 zg 1 Eg = 1e+36 ag 1 Eg = 1e+33 fg 1 Eg = 1e+30 pg 1 Eg = 1e+27 ng 1 Eg = 1e+24 μg 1 Eg = 1e+21 mg 1 Eg = 1e+20 cg 1 Eg = 1e+19 dg 1 Eg = 1e+18 g 1 Eg = 1e+17 dag 1 Eg = 1e+16 hg 1 Eg = 1e+15 kg 1 Eg = 1e+12 Mg 1 Eg = 1e+9 Gg 1 Eg = 1e+6 Tg 1 Eg = 1e+3 Pg 1 Eg = 1e-3 Zg 1 Eg = 1e-6 Yg 1 Eg = 1e-9 Rg 1 Eg = 1e-12 Qg 1 Eg = 3.527396e+16 oz 1 Eg = 2.204623e+15 lb 1 Eg = 1.57473e+14 st 1 Eg = 1.102311e+12 short ton 1 Eg = 9.842065e+11 Long ton
Zettagram (Zg)	The Zettagram (Zg) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 zettagram (Zg) = 1,000,000,000,000,000,000 kilograms (kg) = 1021 grams (one sextillion grams) Features: The prefix "zetta-" represents 1021 (one sextillion) Common Uses: Zettagram is generally used in fields like astrophysics, planetary science and geophysics, where vast quantities of matter, such as the mass of planets, stars or even galaxies, are measured.	1 Zg = 1e+51 qg 1 Zg = 1e+48 rg 1 Zg = 1e+45 yg 1 Zg = 1e+42 zg 1 Zg = 1e+39 ag 1 Zg = 1e+36 fg 1 Zg = 1e+33 pg 1 Zg = 1e+30 ng 1 Zg = 1e+27 μg 1 Zg = 1e+24 mg 1 Zg = 1e+23 cg 1 Zg = 1e+22 dg 1 Zg = 1e+21 g 1 Zg = 1e+20 dag 1 Zg = 1e+19 hg 1 Zg = 1e+18 kg 1 Zg = 1e+15 Mg 1 Zg = 1e+12 Gg 1 Zg = 1e+9 Tg 1 Zg = 1e+6 Pg 1 Zg = 1e+3 Eg 1 Zg = 1e-3 Yg 1 Zg = 1e-6 Rg 1 Zg = 1e-9 Qg 1 Zg = 3.527396e+19 oz 1 Zg = 2.204623e+18 lb 1 Zg = 1.57473e+17 st 1 Zg = 1.102311e+15 short ton 1 Zg = 9.842065e+14 Long ton
Yottagram (Yg)	The Yottagram (Yg) is a unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 yottagram (Yg) = 1,000,000,000,000,000,000,000 kilograms (kg) = 1024 grams (one septillion grams) Features: The prefix "yotta-" represents 1024 (one septillion) Common Uses: Yottagram is primarily used in fields like astrophysics, cosmology and planetary science, where vast amounts of mass, such as the mass of entire galaxies, stars or the observable universe, may be measured.	1 Yg = 1e+54 qg 1 Yg = 1e+51 rg 1 Yg = 1e+48 yg 1 Yg = 1e+45 zg 1 Yg = 1e+42 ag 1 Yg = 1e+39 fg 1 Yg = 1e+36 pg 1 Yg = 1e+33 ng 1 Yg = 1e+30 μg 1 Yg = 1e+27 mg 1 Yg = 1e+26 cg 1 Yg = 1e+25 dg 1 Yg = 1e+24 g 1 Yg = 1e+23 dag 1 Yg = 1e+22 hg 1 Yg = 1e+21 kg 1 Yg = 1e+18 Mg 1 Yg = 1e+15 Gg 1 Yg = 1e+12 Tg 1 Yg = 1e+9 Pg 1 Yg = 1e+6 Eg 1 Yg = 1e+3 Zg 1 Yg = 1e-3 Rg 1 Yg = 1e-6 Qg 1 Yg = 3.527396e+22 oz 1 Yg = 2.204623e+21 lb 1 Yg = 1.57473e+20 st 1 Yg = 1.102311e+18 short ton 1 Yg = 9.842065e+17 Long ton
Ronnagram (Rg)	The Ronnagram (Rg) is a theoretical and extremely large unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 ronnagram (Rg) = 1,000,000,000,000,000,000,000,000 kilograms (kg) = 1027 grams (one octillion grams) Features: The prefix "ronna-" represents 1027 (one octillion) Common Uses: Ronnagram would be used in very specialized scientific fields, such as cosmology or astrophysics, for measuring the mass of extremely large cosmic objects or hypothetical structures of enormous size, such as entire galaxy clusters or the mass of the universe in future or extreme contexts.	1 Rg = 1e+57 qg 1 Rg = 1e+54 rg 1 Rg = 1e+51 yg 1 Rg = 1e+48 zg 1 Rg = 1e+45 ag 1 Rg = 1e+42 fg 1 Rg = 1e+39 pg 1 Rg = 1e+36 ng 1 Rg = 1e+33 μg 1 Rg = 1e+30 mg 1 Rg = 1e+29 cg 1 Rg = 1e+28 dg 1 Rg = 1e+27 g 1 Rg = 1e+26 dag 1 Rg = 1e+25 hg 1 Rg = 1e+24 kg 1 Rg = 1e+21 Mg 1 Rg = 1e+18 Gg 1 Rg = 1e+15 Tg 1 Rg = 1e+12 Pg 1 Rg = 1e+9 Eg 1 Rg = 1e+6 Zg 1 Rg = 1e+3 Yg 1 Rg = 1e-3 Qg 1 Rg = 3.527396e+25 oz 1 Rg = 2.204623e+24 lb 1 Rg = 1.57473e+23 st 1 Rg = 1.102311e+21 short ton 1 Rg = 9.842065e+20 Long ton
Quettagram (Qg)	The Quettagram (Qg) is an extremely large unit of mass in the metric system, part of the International System of Units (SI). Conversions: 1 quettagram (Qg) = 1,000,000,000,000,000,000,000,000,000 kilograms (kg) = 1030 grams (one nonillion grams) Features: The prefix "quetta-" represents 1030 (one nonillion) Common Uses: Quettagram would be used in highly theoretical fields like cosmology, astrophysics or astronomy, for measuring vast amounts of mass, such as the mass of an entire galaxy or even larger structures like galaxy superclusters or even hypothetical mass measurements of entire universes in extreme contexts.	1 Qg = 1e+60 qg 1 Qg = 1e+57 rg 1 Qg = 1e+54 yg 1 Qg = 1e+51 zg 1 Qg = 1e+48 ag 1 Qg = 1e+45 fg 1 Qg = 1e+42 pg 1 Qg = 1e+39 ng 1 Qg = 1e+36 μg 1 Qg = 1e+33 mg 1 Qg = 1e+32 cg 1 Qg = 1e+31 dg 1 Qg = 1e+30 g 1 Qg = 1e+29 dag 1 Qg = 1e+28 hg 1 Qg = 1e+27 kg 1 Qg = 1e+24 Mg 1 Qg = 1e+21 Gg 1 Qg = 1e+18 Tg 1 Qg = 1e+15 Pg 1 Qg = 1e+12 Eg 1 Qg = 1e+9 Zg 1 Qg = 1e+6 Yg 1 Qg = 1e+3 Rg 1 Qg = 3.527396e+28 oz 1 Qg = 2.204623e+27 lb 1 Qg = 1.57473e+26 st 1 Qg = 1.102311e+24 short ton 1 Qg = 9.842065e+23 Long ton
Ounce (oz)	The Ounce (oz) is a unit of mass commonly used in the imperial and US customary systems. Conversions: 1 ounce (oz) = 1/16 of a pound or approximately 28.35 grams Common Uses: Ounce is commonly used to measure food portions, liquids (in fluid ounces) and small items such as jewelry, medications or postage.	1 oz = 2.834952e+31 qg 1 oz = 2.834952e+28 rg 1 oz = 2.834952e+25 yg 1 oz = 2.834952e+22 zg 1 oz = 2.834952e+19 ag 1 oz = 2.834952e+16 fg 1 oz = 2.834952e+13 pg 1 oz = 2.834952e+10 ng 1 oz = 2.834952e+7 μg 1 oz = 2.834952e+4 mg 1 oz = 2.834952e+3 cg 1 oz = 2.834952e+2 dg 1 oz = 2.834952e+1 g 1 oz = 2.834952e+0 dag 1 oz = 2.834952e-1 hg 1 oz = 2.834952e-2 kg 1 oz = 2.834952e-5 Mg 1 oz = 2.834952e-8 Gg 1 oz = 2.834952e-11 Tg 1 oz = 2.834952e-14 Pg 1 oz = 2.834952e-17 Eg 1 oz = 2.834952e-20 Zg 1 oz = 2.834952e-23 Yg 1 oz = 2.834952e-26 Rg 1 oz = 2.834952e-29 Qg 1 oz = 6.25e-2 lb 1 oz = 4.464286e-3 st 1 oz = 3.125e-5 short ton 1 oz = 2.790179e-5 Long ton
Pound (lb)	The Pound (lb) is a unit of mass used primarily in the imperial and US customary systems. Conversions: 1 pound (lb) = 16 ounces (oz) or approximately 0.4536 kilograms (kg) Common Uses: Pound is frequently used to measure body weight, produce, meat and other goods in both personal and commercial contexts.	1 lb = 4.535924e+32 qg 1 lb = 4.535924e+29 rg 1 lb = 4.535924e+26 yg 1 lb = 4.535924e+23 zg 1 lb = 4.535924e+20 ag 1 lb = 4.535924e+17 fg 1 lb = 4.535924e+14 pg 1 lb = 4.535924e+11 ng 1 lb = 4.535924e+8 μg 1 lb = 4.535924e+5 mg 1 lb = 4.535924e+4 cg 1 lb = 4.535924e+3 dg 1 lb = 4.535924e+2 g 1 lb = 4.535924e+1 dag 1 lb = 4.535924e+0 hg 1 lb = 4.535924e-1 kg 1 lb = 4.535924e-4 Mg 1 lb = 4.535924e-7 Gg 1 lb = 4.535924e-10 Tg 1 lb = 4.535924e-13 Pg 1 lb = 4.535924e-16 Eg 1 lb = 4.535924e-19 Zg 1 lb = 4.535924e-22 Yg 1 lb = 4.535924e-25 Rg 1 lb = 4.535924e-28 Qg 1 lb = 1.6e+1 oz 1 lb = 7.142857e-2 st 1 lb = 5e-4 short ton 1 lb = 4.464286e-4 Long ton
Stone (st)	The Stone (st) is a unit of mass commonly used in the UK and Ireland, particularly for measuring body weight. Conversions: 1 stone (st) = 14 pounds (lb) or approximately 6.35 kilograms (kg) Common Uses: The stone is mostly used to express body weight, with people often saying their weight in "stones and pounds" (e.g., 10 st 7 lb).	1 st = 6.350293e+33 qg 1 st = 6.350293e+30 rg 1 st = 6.350293e+27 yg 1 st = 6.350293e+24 zg 1 st = 6.350293e+21 ag 1 st = 6.350293e+18 fg 1 st = 6.350293e+15 pg 1 st = 6.350293e+12 ng 1 st = 6.350293e+9 μg 1 st = 6.350293e+6 mg 1 st = 6.350293e+5 cg 1 st = 6.350293e+4 dg 1 st = 6.350293e+3 g 1 st = 6.350293e+2 dag 1 st = 6.350293e+1 hg 1 st = 6.350293e+0 kg 1 st = 6.350293e-3 Mg 1 st = 6.350293e-6 Gg 1 st = 6.350293e-9 Tg 1 st = 6.350293e-12 Pg 1 st = 6.350293e-15 Eg 1 st = 6.350293e-18 Zg 1 st = 6.350293e-21 Yg 1 st = 6.350293e-24 Rg 1 st = 6.350293e-27 Qg 1 st = 2.24e+2 oz 1 st = 1.4e+1 lb 1 st = 7e-3 short ton 1 st = 6.25e-3 Long ton
Ton (short ton)	The Ton (short ton) is a unit of mass used primarily in the United States. Conversions: 1 short ton = 2,000 pounds (lb) or approximately 907.18 kilograms (kg) Common Uses: The short ton is commonly used to measure the weight of cargo, building materials and heavy equipment in the US.	1 short ton = 9.071847e+35 qg 1 short ton = 9.071847e+32 rg 1 short ton = 9.071847e+29 yg 1 short ton = 9.071847e+26 zg 1 short ton = 9.071847e+23 ag 1 short ton = 9.071847e+20 fg 1 short ton = 9.071847e+17 pg 1 short ton = 9.071847e+14 ng 1 short ton = 9.071847e+11 μg 1 short ton = 9.071847e+8 mg 1 short ton = 9.071847e+7 cg 1 short ton = 9.071847e+6 dg 1 short ton = 9.071847e+5 g 1 short ton = 9.071847e+4 dag 1 short ton = 9.071847e+3 hg 1 short ton = 9.071847e+2 kg 1 short ton = 9.071847e-1 Mg 1 short ton = 9.071847e-4 Gg 1 short ton = 9.071847e-7 Tg 1 short ton = 9.071847e-10 Pg 1 short ton = 9.071847e-13 Eg 1 short ton = 9.071847e-16 Zg 1 short ton = 9.071847e-19 Yg 1 short ton = 9.071847e-22 Rg 1 short ton = 9.071847e-25 Qg 1 short ton = 3.2e+4 oz 1 short ton = 2e+3 lb 1 short ton = 1.428571e+2 st 1 short ton = 8.928571e-1 Long ton
Long ton	The Long ton (also known as the imperial ton or UK ton) is a unit of mass used primarily in the United Kingdom and some other countries that follow the imperial system. Conversions: 1 long ton = 2,240 pounds (lb) or approximately 1,016 kilograms (kg) Common Uses: The long ton is typically used for measuring cargo, shipping weights and heavy goods in the UK and some Commonwealth countries.	1 Long ton = 1.016047e+36 qg 1 Long ton = 1.016047e+33 rg 1 Long ton = 1.016047e+30 yg 1 Long ton = 1.016047e+27 zg 1 Long ton = 1.016047e+24 ag 1 Long ton = 1.016047e+21 fg 1 Long ton = 1.016047e+18 pg 1 Long ton = 1.016047e+15 ng 1 Long ton = 1.016047e+12 μg 1 Long ton = 1.016047e+9 mg 1 Long ton = 1.016047e+8 cg 1 Long ton = 1.016047e+7 dg 1 Long ton = 1.016047e+6 g 1 Long ton = 1.016047e+5 dag 1 Long ton = 1.016047e+4 hg 1 Long ton = 1.016047e+3 kg 1 Long ton = 1.016047e+0 Mg 1 Long ton = 1.016047e-3 Gg 1 Long ton = 1.016047e-6 Tg 1 Long ton = 1.016047e-9 Pg 1 Long ton = 1.016047e-12 Eg 1 Long ton = 1.016047e-15 Zg 1 Long ton = 1.016047e-18 Yg 1 Long ton = 1.016047e-21 Rg 1 Long ton = 1.016047e-24 Qg 1 Long ton = 3.584e+4 oz 1 Long ton = 2.24e+3 lb 1 Long ton = 1.6e+2 st 1 Long ton = 1.12e+0 short ton

Mass and Weight Are Not the Same Thing

Strictly, these units measure mass — the amount of matter in an object, which does not change no matter where the object is. Weight is the force gravity exerts on that mass, so it varies with location: the same object weighs about a sixth as much on the Moon while its mass is unchanged.

In everyday use the words are interchangeable, and scales are calibrated so that reading a mass in kilograms works perfectly well on Earth. The distinction matters in physics and engineering, where force is properly measured in newtons, but for cooking, shipping, and shopping the conversions here are exactly what you want.

The Metric Prefixes

Every metric unit on this page is the gram scaled by a power of ten, which is why converting within the system never requires a conversion factor — only a shift of the decimal point.

• Everyday range — milligram, gram, kilogram, tonne. These cover nearly all practical use.
• Small scales — microgram and nanogram appear in pharmacology and analytical chemistry, where doses and trace quantities are routinely this small.
• Very small scales — picogram down to quectogram belong to molecular and particle physics. The quectogram, 10⁻³⁰ grams, was added to the SI in 2022 along with the ronto-, ronna-, and quetta- prefixes.
• Large scales — gigagram and above are used in earth science and climate work, where emissions and ice masses are quoted in teragrams or petagrams.

A note on the tonne: it is 1,000 kilograms and is also called the megagram. It is not the same as either imperial ton, which is the source of a good deal of confusion in shipping.

The Three Different Tons

This is the single most common source of error in mass conversion, because all three are called a "ton" and they differ by enough to matter commercially.

• Tonne (metric ton) — 1,000 kg, about 2,204.6 lb. The international standard.
• Short ton — 2,000 lb, about 907.2 kg. Standard in the United States, and what "ton" usually means there.
• Long ton — 2,240 lb, about 1,016 kg. The British imperial ton, still used in some shipping contexts.

The spread between the smallest and largest is about 12%. On a single shipping container that is a substantial quantity of cargo, so it is worth confirming which ton a document means.

Worked Examples

• A 12 stone person — 168 pounds, or about 76.2 kilograms.
• A recipe calling for 8 ounces of flour — about 227 grams.
• A 5 kg parcel — about 11 pounds, or 11 lb 0.4 oz.
• A 500 mg tablet — half a gram, or 0.0176 ounces.
• A 1.5 short ton vehicle — 3,000 pounds, about 1,361 kilograms, or 1.36 tonnes.

Common Uses

• Cooking and baking — converting recipes between grams and ounces, where baking in particular rewards precision.
• Shipping and postage — matching parcel weights to carrier brackets stated in the other system.
• Health and fitness — moving between kilograms, pounds, and stones.
• Science and medicine — dosages and reagent quantities in milligrams and micrograms.
• Freight and logistics — reconciling tonnes with short and long tons.
• Trade and manufacturing — reading material specifications written for another market.

Frequently Asked Questions

How many grams are in a pound?

Exactly 453.59237. The pound has been defined in terms of the kilogram since 1959, so the relationship is exact rather than measured. One kilogram is about 2.2046 pounds.

Is a stone still used?

Yes, mainly in the United Kingdom and Ireland for body weight. One stone is 14 pounds, so 11 stone 4 is 158 pounds or about 71.7 kilograms. It is rarely used elsewhere and almost never in the United States.

Why is a fluid ounce not the same as an ounce?

Because they measure different quantities. An ounce is mass; a fluid ounce is volume. They only coincide for a substance with the right density — near enough for water, not for flour, oil, or honey. Converting a recipe between the two requires knowing the ingredient.

What is a troy ounce?

A separate unit used for precious metals, equal to about 31.1 grams, which is heavier than the ordinary avoirdupois ounce of about 28.35 grams. Gold and silver prices are quoted per troy ounce. This tool uses the standard ounce.

Why do such tiny units exist?

Because scientific work needs them. Masses of individual molecules, trace contaminants, and particles fall far below anything a kitchen scale registers, and expressing them in a dedicated unit is clearer than writing long strings of leading zeros.