gram
gmass · International · Modern
1 g = 0.001 kg.
Converter
mass · Ancient Roman · Republic/Empire
uncia (Roman ounce)
approx.range
- Record
- M142
- Definition quality
- Reconstructed approximate
- Conversion mode
- range
- Calculator
- Range only
Definition
1 uncia = 1/12 Roman libra; using representative libra 327.453 g → ≈27.29 g
Documented range
Surviving evidence places one uncia (Roman ounce) between 0 and 0 kilograms. It is recorded as a range because the documented values were not uniform.
History & use
The Roman uncial system divided many quantities into twelfths, not just mass.
Modern use
Modern use is context-dependent and varies by region or measurement system.
Sources & evidence
Source tier — · confidence high
Related measurements
kilogram
kgmass · International · Modern
SI base unit of mass. The Planck constant is fixed exactly at 6.62607015×10^-34 J·s, which defines the kilogram through the metre and second.
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1 avoirdupois ounce = exactly 1/16 international pound = 0.028349523125 kg.
mass · UK / US · Modern / historical
1 international avoirdupois pound = exactly 0.45359237 kg.
stone
stmass · UK / US · Modern / historical
1 stone = 14 lb = exactly 6.35029318 kg using the international pound.
mass · International · Modern
Dalton/u is 1/12 of the mass of a free carbon-12 atom in its ground state. CODATA 2022: 1.66053906892(52)×10^-27 kg.
approx.mass · Ancient Greece / Rome · Antiquity
Greek talent was not one universal standard.
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