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Weight and mass conversions

Every mass unit on the site, and every conversion between them. Each page shows a full table, the exact formula and a live calculator.

All mass units

Every mass unit and its size relative to the base unit.
Unit Symbol In kilogram
kilogram kg 1
gram g 0.001
milligram mg 0.000001
microgram µg 1 × 10^-9
tonne t 1,000
pound lb 0.45359237
ounce oz 0.02834952313
stone st 6.35029318
short ton ton 907.18474
long ton long ton 1,016.046909
carat ct 0.0002
grain gr 0.00006479891

Common conversions

Sources

  1. Guide for the Use of the International System of Units (SP 811) — NIST (Public domain (US Government))
  2. The International System of Units (SI Brochure) — Bureau International des Poids et Mesures

How these figures are compiled and checked