Mass conversions

Select a unit of mass

About mass

Mass is a physical property that expresses (quantitatively) how heavy something is.

The base unit of mass in the International System of Units (SI) is the kilogram (kg). Common units of mass currently in use include grams, milligrams, micrograms, tonnes, ounces, troy ounces and pounds.

Common mass conversions

  • 1 kilogram = 1,000 grams = 1,000,000 milligrams
  • 1 tonne = 1,000 kilograms = 1,000,000 grams
  • 1 milligram = 0.001 grams = 1,000 micrograms
  • 1 microgram = 0.001 milligrams = 1,000 nanograms
  • 1 avoirdupois ounce = 28.349523125 grams
  • 1 troy ounce = 31.1034768 grams
  • 1 avoirdupois pound = 453.59237 grams
  • 1 troy pound = 373.2417216 grams
  • 1 avoirdupois grain = 1 troy grain = 64.79891 milligrams

Units of mass measurement

Conversions from and to various units of mass.