Roman pound libra
About the Roman pound
The Roman libra was about 327 grams, divided into 12 unciae. It survives in the abbreviation lb for the pound and in the symbol £ for the British pound sterling, which originally represented a pound weight of silver. Estimates of its exact mass vary by a few grams.
Related Units
Kilogram
kgBase unit; h = 6.62607015 × 10⁻³⁴ J·s exactly
The kilogram is defined by fixing the Planck constant at exactly 6.62607015 × 10⁻³⁴ joule-seconds. Until 20 May 2019 it...
Tonne
t1 t = 1000 kg (exact)
The tonne, or metric ton, is one thousand kilograms, equal to one megagram. It lies between the US short ton of...
Metric carat
ct1 ct = 200 mg (exact)
The metric carat of exactly 200 milligrams is the standard unit for weighing gemstones and pearls. Before...
Pound
lb0.45359237 kg (exact)
The avoirdupois pound is defined as exactly 0.45359237 kilograms. The figure was chosen in the 1959 agreement as a...