Weight conversions
Weight and mass converter for metric and imperial units — kilograms, grams, milligrams, metric and short/long tons, pounds, ounces, stones and more. Factors follow the 2019 SI redefinition of the kilogram based on Planck's constant.
The SI base unit of mass, redefined in 2019 via Planck's constant
Kilogram to Gram
1 kg = 1,000 g
Kilogram to Milligram
1 kg = 1,000,000 mg
Kilogram to Microgram
1 kg = 1,000,000,000 µg
Kilogram to Pound
1 kg = 2.20462 lb
Kilogram to Ounce
1 kg = 35.274 oz
Kilogram to Metric Ton
1 kg = 0.001 t
Kilogram to US Ton
1 kg = 0.001102 ton (US)
Kilogram to UK Ton
1 kg = 0.0009842 ton (UK)
Kilogram to Stone
1 kg = 0.1575 st
Kilogram to Carat
1 kg = 5,000 ct
Kilogram to Grain
1 kg = 15,432.36 gr
Standard unit in European cooking, pharmaceuticals and jewellery
Gram to Kilogram
1 g = 0.001 kg
Gram to Milligram
1 g = 1,000 mg
Gram to Microgram
1 g = 1,000,000 µg
Gram to Pound
1 g = 0.002205 lb
Gram to Ounce
1 g = 0.03527 oz
Gram to Metric Ton
1 g = 1.0000e-6 t
Gram to US Ton
1 g = 1.1023e-6 ton (US)
Gram to UK Ton
1 g = 9.8421e-7 ton (UK)
Gram to Stone
1 g = 0.0001575 st
Gram to Carat
1 g = 5 ct
Gram to Grain
1 g = 15.4324 gr
The standard dosing unit for oral medications and vitamins
Milligram to Kilogram
1 mg = 1.0000e-6 kg
Milligram to Gram
1 mg = 0.001 g
Milligram to Microgram
1 mg = 1,000 µg
Milligram to Pound
1 mg = 2.2046e-6 lb
Milligram to Ounce
1 mg = 3.5274e-5 oz
Milligram to Metric Ton
1 mg = 1.0000e-9 t
Milligram to US Ton
1 mg = 1.1023e-9 ton (US)
Milligram to UK Ton
1 mg = 9.8421e-10 ton (UK)
Milligram to Stone
1 mg = 1.5747e-7 st
Milligram to Carat
1 mg = 0.005 ct
Milligram to Grain
1 mg = 0.01543 gr
Used for fat-soluble vitamins, trace elements and potent drugs
Microgram to Kilogram
1 µg = 1.0000e-9 kg
Microgram to Gram
1 µg = 1.0000e-6 g
Microgram to Milligram
1 µg = 0.001 mg
Microgram to Pound
1 µg = 2.2046e-9 lb
Microgram to Ounce
1 µg = 3.5274e-8 oz
Microgram to Metric Ton
1 µg = 1.0000e-12 t
Microgram to US Ton
1 µg = 1.1023e-12 ton (US)
Microgram to UK Ton
1 µg = 9.8421e-13 ton (UK)
Microgram to Stone
1 µg = 1.5747e-10 st
Microgram to Carat
1 µg = 5.0000e-6 ct
Microgram to Grain
1 µg = 1.5432e-5 gr
The US standard weight unit and common UK co-unit
Pound to Kilogram
1 lb = 0.4536 kg
Pound to Gram
1 lb = 453.592 g
Pound to Milligram
1 lb = 453,592.37 mg
Pound to Microgram
1 lb = 453,592,370 µg
Pound to Ounce
1 lb = 16 oz
Pound to Metric Ton
1 lb = 0.0004536 t
Pound to US Ton
1 lb = 0.0005 ton (US)
Pound to UK Ton
1 lb = 0.0004464 ton (UK)
Pound to Stone
1 lb = 0.07143 st
Pound to Carat
1 lb = 2,267.96 ct
Pound to Grain
1 lb = 7,000 gr
Used in US and UK cooking recipes and precious-metal trade (troy ounce)
Ounce to Kilogram
1 oz = 0.02835 kg
Ounce to Gram
1 oz = 28.3495 g
Ounce to Milligram
1 oz = 28,349.52 mg
Ounce to Microgram
1 oz = 28,349,523.13 µg
Ounce to Pound
1 oz = 0.0625 lb
Ounce to Metric Ton
1 oz = 2.8350e-5 t
Ounce to US Ton
1 oz = 3.1250e-5 ton (US)
Ounce to UK Ton
1 oz = 2.7902e-5 ton (UK)
Ounce to Stone
1 oz = 0.004464 st
Ounce to Carat
1 oz = 141.748 ct
Ounce to Grain
1 oz = 437.5 gr
The international shipping standard — 1000 kg exactly
Metric Ton to Kilogram
1 t = 1,000 kg
Metric Ton to Gram
1 t = 1,000,000 g
Metric Ton to Milligram
1 t = 1,000,000,000 mg
Metric Ton to Microgram
1 t = 1,000,000,000,000 µg
Metric Ton to Pound
1 t = 2,204.62 lb
Metric Ton to Ounce
1 t = 35,273.96 oz
Metric Ton to US Ton
1 t = 1.10231 ton (US)
Metric Ton to UK Ton
1 t = 0.9842 ton (UK)
Metric Ton to Stone
1 t = 157.473 st
Metric Ton to Carat
1 t = 5,000,000 ct
Metric Ton to Grain
1 t = 15,432,358.35 gr
The US tonnage unit — 2000 pounds, 9% smaller than a metric ton
US Ton to Kilogram
1 ton (US) = 907.185 kg
US Ton to Gram
1 ton (US) = 907,184.74 g
US Ton to Milligram
1 ton (US) = 907,184,740 mg
US Ton to Microgram
1 ton (US) = 907,184,740,000 µg
US Ton to Pound
1 ton (US) = 2,000 lb
US Ton to Ounce
1 ton (US) = 32,000 oz
US Ton to Metric Ton
1 ton (US) = 0.9072 t
US Ton to UK Ton
1 ton (US) = 0.8929 ton (UK)
US Ton to Stone
1 ton (US) = 142.857 st
US Ton to Carat
1 ton (US) = 4,535,923.7 ct
US Ton to Grain
1 ton (US) = 14,000,000 gr
The traditional British ton — 2240 pounds, 1.6% larger than metric ton
UK Ton to Kilogram
1 ton (UK) = 1,016.05 kg
UK Ton to Gram
1 ton (UK) = 1,016,046.91 g
UK Ton to Milligram
1 ton (UK) = 1,016,046,908.8 mg
UK Ton to Microgram
1 ton (UK) = 1,016,046,908,800 µg
UK Ton to Pound
1 ton (UK) = 2,240 lb
UK Ton to Ounce
1 ton (UK) = 35,840 oz
UK Ton to Metric Ton
1 ton (UK) = 1.01605 t
UK Ton to US Ton
1 ton (UK) = 1.12 ton (US)
UK Ton to Stone
1 ton (UK) = 160 st
UK Ton to Carat
1 ton (UK) = 5,080,234.54 ct
UK Ton to Grain
1 ton (UK) = 15,680,000 gr
Used in the UK and Ireland for human body weight — 14 pounds
Stone to Kilogram
1 st = 6.35029 kg
Stone to Gram
1 st = 6,350.29 g
Stone to Milligram
1 st = 6,350,293.18 mg
Stone to Microgram
1 st = 6,350,293,180 µg
Stone to Pound
1 st = 14 lb
Stone to Ounce
1 st = 224 oz
Stone to Metric Ton
1 st = 0.00635 t
Stone to US Ton
1 st = 0.007 ton (US)
Stone to UK Ton
1 st = 0.00625 ton (UK)
Stone to Carat
1 st = 31,751.47 ct
Stone to Grain
1 st = 98,000 gr
The international unit for gemstone weight — 200 mg exactly
Carat to Kilogram
1 ct = 0.0002 kg
Carat to Gram
1 ct = 0.2 g
Carat to Milligram
1 ct = 200 mg
Carat to Microgram
1 ct = 200,000 µg
Carat to Pound
1 ct = 0.0004409 lb
Carat to Ounce
1 ct = 0.007055 oz
Carat to Metric Ton
1 ct = 2.0000e-7 t
Carat to US Ton
1 ct = 2.2046e-7 ton (US)
Carat to UK Ton
1 ct = 1.9684e-7 ton (UK)
Carat to Stone
1 ct = 3.1495e-5 st
Carat to Grain
1 ct = 3.08647 gr
Used in firearms (bullet weight) and some pharmaceutical dosing
Grain to Kilogram
1 gr = 6.4799e-5 kg
Grain to Gram
1 gr = 0.0648 g
Grain to Milligram
1 gr = 64.7989 mg
Grain to Microgram
1 gr = 64,798.91 µg
Grain to Pound
1 gr = 0.0001429 lb
Grain to Ounce
1 gr = 0.002286 oz
Grain to Metric Ton
1 gr = 6.4799e-8 t
Grain to US Ton
1 gr = 7.1429e-8 ton (US)
Grain to UK Ton
1 gr = 6.3776e-8 ton (UK)
Grain to Stone
1 gr = 1.0204e-5 st
Grain to Carat
1 gr = 0.324 ct
Tips for weight conversions
Adult body weight is measured in kilograms in most of the world and in pounds in the US. 70 kg equals about 154 lb — the ratio is roughly 1 : 2.2.
American recipes use ounces and cups; European recipes use grams. 1 oz ≈ 28.35 g.
Medicines are measured in milligrams (mg) or micrograms (µg). Never confuse the two — a factor of 1000 can be dangerous.
The metric ton (1000 kg), US short ton (907 kg) and UK long ton (1016 kg) are all different — always specify which "ton" in international trade.
Common mistakes to avoid
Confusing a metric ton (1000 kg) with a US short ton (907 kg) in shipping contracts.
Using the regular ounce (28.35 g) when the recipe or the market calls for a troy ounce (31.10 g) for precious metals.
Weighing yourself at different times of day — body weight can vary 1–2 kg across a single day.
Confusing grams with milligrams on medication labels — the difference is 1000×.
Learn about each unit
Full encyclopedia page for every weight unit — definition, history, uses, tips.