Online Mathematics Conversions

Calculate All Weight and Mass Conversions

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Metric measurements

Metric weight units are based around the weight of respective metric volumes of water. For example, a liter of water weighs one kilogram.

Imperial / American measurements

Precious metals are normally measured in "troy" units (troy pounds and troy ounces), please do not confuse these with the standard measurements. We are not sure of the origins of a Stone, Pound or Ounce. If you know, please email us...