Weight & Mass Units Conversion

Weight and mass measurement units conversion tool to convert metric, imperial and other international units. Enter a value below and select the units to convert. The result is rounded to 4 decimal places by default.
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Mass or Weight?

Mass and weight are different. Mass means how much matter is in an object. Weight is the measure of the force of gravity on that object.

For example, your body mass is the same on earth, on moon or on Jupiter but if you weigh 100 kilograms on earth, you weigh 16.6 kilograms on the moon and 236.4 kilograms on Jupiter because their gravities are different than earth.

The mass units in the converter:

"carat (ct), centigram, decigram, dekagram, dram, grain, gram (g), hectogram (hg), hundredweight, kilogram (kg), kiloton, megagram, megatonne, microgram, milligram (mg), nanogram, ounce (oz), petagram, picogram, pound (lb), quarter, stone (st) and ton"

Metric Mass Units

The base unit of mass in the metric system is kilogram and is equal to the mass of the international prototype of the kilogram. This prototype, made of platinum-iridium is kept at the International Bureau of Weights and Measures (BIPM).

Because the metric system is a decimal system, all other metric mass units are either the fractions or the multiples of kilogram. The most frequently used metric mass units are kilogram (kg), gram (g) and milligram (mg).

Here is a quick reference list for the base metric mass unit, kilogram:

  • 1 kilogram = 1000 grams
  • 1 kilogram = 2.20462 pounds
  • 1 kilogram = 35.274 ounces
  • 1 kilogram = 0.157 stone
  • 1 kilogram = 11000 metric ton

Imperial and US Customary Mass Units

In the imperial and the US Customary system the fundamental unit of mass is pound (lb). All other units are either the fractions or the multiples of pound.

The imperial and the US Customary system share the same mass units and only difference is with the hundredweight (112 pounds in imperial system and 100 pounds in US Customary system ) and the ton (2240 pounds in the imperial system and 2000 pounds in the US Customary system).

Here is the list of the Imperial and the US Customary mass units:

  • grain (gr) = 17000 pound
  • drachm (dr) = 1256 pound
  • ounce (oz) = 116 pound
  • pound (lb)
  • stone (st) = 14 pounds
  • quarter (qtr) = 28 pounds
  • hundredweight (cwt) = 112 pounds in imperial, 100 pounds in US Customary
  • ton (t) = 2240 pounds in imperial, 2000 pounds in US Customary

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