Measures: Mass — how much stuff
Gram
A thousandth of a kilogram — the kitchen-scale unit.
MassHow it's defined
Exactly 0.001 kg. Historically the base unit of the metric system; the SI moved the base to the kilogram, but the gram remains the everyday workhorse.
Convert — honestly
0.001 kg
Kilogram · factor exact — the base unit itself
0.000001 t
Tonne · factor exact — exact by definition
0.00220462262 lb
Pound · factor exact — exact by the 1959 agreement
6.0221e+23 u
Atomic mass unit · factor measured — measured (CODATA), carries uncertainty
Conversions run through the kilogram using the stated factors — no rounding beyond display precision, and every factor says whether it's exact or measured.
Where you meet it
- Elementii — molecular weights are grams per mole ↗ open elementii
- Nutrition labels and postage scales
Other ways to measure mass
Source
This page is an authored summary of the authoritative definition — checkable one click away.
BIPM — The International System of Units (SI Brochure, 9th ed.)