Grain gr
About the Grain
The grain is exactly 64.79891 milligrams and is the one unit shared by the avoirdupois, troy and apothecaries' systems. It was based on a grain of barley or wheat. Bullet and arrow weights and some medicine doses are still given in grains.
Related Units
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...
Ounce
oz28.349523125 g (exact)
The avoirdupois ounce is one sixteenth of a pound, exactly 28.349523125 grams. It is distinct from the troy ounce of...
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...