# Mass conversions

mass conversions
Select a unit of mass

## What is mass?

Definition: 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 (g), milligrams (mg), micrograms (μg), tonnes (t), ounces (oz), troy ounces (oz t) and pounds (lb).

## Common mass conversions

• 1 kilogram (kg) = 1,000 grams (g) = 1,000,000 milligrams (mg)
• 1 tonne (t) = 1,000 kilograms (kg) = 1,000,000 grams (g)
• 1 milligram (mg) = 0.001 grams (g) = 1,000 micrograms (μg)
• 1 microgram (μg) = 0.001 milligrams (mg) = 1,000 nanograms (ng)
• 1 avoirdupois ounce (oz) = 28.349523125 grams (g)
• 1 troy ounce (oz t) = 31.1034768 grams (g)
• 1 avoirdupois pound (lb) = 453.59237 grams (g)
• 1 troy pound (lb t) = 373.2417216 grams (g)
• 1 avoirdupois grain (gr) = 1 troy grain (gr t) = 64.79891 milligrams (mg)

## Subdivisions and multiples of the gram using SI prefixes

 Subdivisions of the gram Multiples of the gram Name Symbol Value Name Symbol Value decigram dg 10-1 g decagram dag 101 g centigram cg 10-2 g hectogram hg 102 g milligram mg 10-3 g kilogram kg 103 g microgram μg 10-6 g megagram Mg 106 g nanogram ng 10-9 g gigagram Gg 109 g picogram pg 10-12 g teragram Tg 1012 g femtogram fg 10-15 g petagram Pg 1015 g attogram ag 10-18 g exagram Eg 1018 g zeptogram zg 10-21 g zettagram Zg 1021 g yoctogram yg 10-24 g yottagram Yg 1024 g