gram
gmass · International · Modern
1 g = 0.001 kg.
Converter
mass · troy weight · Current specialist + historical
pennyweight
exact
- Record
- M077
- Definition quality
- Exact by definition
- Conversion mode
- multiplicative
- Calculator
- Fully calculable
Definition
1 dwt = 24 grains = 1/20 troy oz = 1.55517384 g
Reference value
One pennyweight is exactly 0.0015551738 kilograms.
History & use
Pennyweight is part of the troy system and survives in jewelry and precious-metal work.
Modern use
Modern use is context-dependent and varies by region or measurement system.
Sources & evidence
Source tier — · confidence high
- Office of Weights and Measures, National Institute of Standards and Technology — https://nvlpubs.nist.gov/nistpubs/hb/2026/NIST.HB.44-2026.pdf
- National Bureau of Standards / Commonwealth national standards laboratories — https://www.nist.gov/pml/us-surveyfoot
- National Institute of Standards and Technology — https://www.nist.gov/pml/special-publication-811
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 tonne = 1000 kg.
mass · UK / US · Modern / historical
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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