# Atomic mass unit conversions

## Convert atomic mass units to

atomic mass unit (unit of mass), pl. atomic mass units, abbr. u or amu

The atomic mass unit conversion selector selects the mass/weight measurement unit to convert to starting from atomic mass units (amu). To make a conversion starting from a unit of mass other than atomic mass unit, simply click on the "Reset" button.

The unified atomic mass unit (or dalton) is a unit of mass defined as 1/12 weight of carbon-12 in its nuclear and electronic ground state.

1 u = 1/12 m(12C)

The atomic mass unit (u) is equal to 1.660538921(73) × 10-27 kilograms (1 u = 1.660538921(73) × 10-27 kg), the base unit of mass in the International System of Units (SI). It is also equal to 1,822.88839 electron rest mass (me).

The energy equivalent of 1 amu:

1 amu = 931.494061(21) × 106 eV/c2 = 931.494061(21) MeV/c2 = 0.931494061(21) GeV/c2

The atomic mass unit is used to indicate the mass on an atomic or molecular scale.

Symbol: u or amu (old abbreviation)

Plural: atomic mass units

Also known as: dalton (plural: daltons, symbol: Da)

Atomic mass unit conversions: a compehensive list with conversions from atomic mass units to other (metric, imperial, or customary) mass and weight measurement units is presented below.

Back to atomic mass unit (amu)

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