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Weight Converter

Convert a weight or mass measurement using the conversion calculator below.
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More Weight Conversion Calculators

See a complete list of conversion calculators for each unit of weight by selecting one below.
US Customary & Imperial Units
SI Units
Other Units
Body Weight

What is Weight or Mass?

Weight is an object's relative mass and the force of gravity on an object. According to NASA, weight or mass is the force generated by the gravitational attraction of the earth.[1]

Because the mass of an object is really the force of gravity on it, the mass of an object will be the same everywhere on Earth.

In space objects are weightless and the mass of an object on another planet with a different gravitational force will be different.

Icon showing a scale to convey weight

Scales are instruments that measure weight and vary in size from fitting into your pocket to being larger than a semi truck. Common measures of weight are tons, pounds, ounces, and grams.

Tons, pounds, and ounces are US customary and imperial units of mass, while kilograms, grams, and other multiples of the gram are metric units of mass.

How to Convert Units of Weight

There are two steps to convert a unit of weight to a different unit.

First, you'll need to find the conversion ratio, or the rate of one unit to another. Use the conversion chart below to find the conversion ratio for your two units.

Once you've found the conversion ratio, simply multiply the value you want to convert by the conversion ratio.

Weight Conversion Chart

Equivalent metric and imperial weight measurements
Convert From Ton Pound Ounce Metric Ton Long Ton Kilogram Gram Milligram Carat Calorie Stone
1 ton = 1 t 2,000 lb 32,000 oz 0.907185 t 0.892857 lt 907.18474 kg 907,185 g 907,184,740 mg 4,535,924 ct 7,000,000 kcal 142.857143 st
1 pound = 0.0005 t 1 lb 16 oz 0.000454 t 0.000446 lt 0.453592 kg 453.59237 g 453,592 mg 2,268 ct 3,500 kcal 0.071429 st
1 ounce = 0.00003125 t 0.0625 lb 1 oz 0.00002835 t 0.000027902 lt 0.02835 kg 28.349523 g 28,350 mg 141.747616 ct 218.75 kcal 0.004464 st
1 metric ton = 1.102311 t 2,205 lb 35,274 oz 1 t 0.984207 lt 1,000 kg 1,000,000 g 1,000,000,000 mg 5,000,000 ct 7,716,179 kcal 157.473044 st
1 long ton = 1.12 t 2,240 lb 35,840 oz 1.016047 t 1 lt 1,016 kg 1,016,047 g 1,016,046,900 mg 5,080,235 ct 7,840,000 kcal 159.999999 st
1 kilogram = 0.001102 t 2.204623 lb 35.273962 oz 0.001 t 0.000984 lt 1 kg 1,000 g 1,000,000 mg 5,000 ct 7,716 kcal 0.157473 st
1 gram = 0.0000011023 t 0.002205 lb 0.035274 oz 0.000001 t 0.00000098421 lt 0.001 kg 1 g 1,000 mg 5 ct 7.716179 kcal 0.000157 st
1 milligram = 0.0000000011023 t 0.0000022046 lb 0.000035274 oz 0.000000001 t 0.00000000098421 lt 0.000001 kg 0.001 g 1 mg 0.005 ct 0.007716 kcal 0.00000015747 st
1 carat = 0.00000022046 t 0.000441 lb 0.007055 oz 0.0000002 t 0.00000019684 lt 0.0002 kg 0.2 g 200 mg 1 ct 1.543236 kcal 0.000031495 st
1 calorie = 0.00000014286 t 0.000286 lb 0.004571 oz 0.0000001296 t 0.00000012755 lt 0.00013 kg 0.129598 g 129.59782 mg 0.647989 ct 1 kcal 0.000020408 st
1 stone = 0.007 t 14 lb 224 oz 0.00635 t 0.00625 lt 6.350293 kg 6,350 g 6,350,293 mg 31,751 ct 49,000 kcal 1 st

References

  1. NASA, What is Weight?, https://www.grc.nasa.gov/WWW/k-12/airplane/weight1.html

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