Mass or weight
Input
carats (metric)
Earth masses
grains
grams
hudredweights (long)
hudredweights (short)
kilograms [kg]
ounces (avoirdupois)
ounces (troy)
pounds (avoirdupois)
pounds (troy)
Solar masses
slugs (g-pounds)
stones
tons (UK or long)
tons (US or short)
tonnes
Output
carats (metric)
Earth masses
grains
grams
hudredweights (long)
hudredweights (short)
kilograms [kg]
ounces (avoirdupois)
ounces (troy)
pounds (avoirdupois)
pounds (troy)
Solar masses
slugs (g-pounds)
stones
tons (UK or long)
tons (US or short)
tonnes
The SI unit for mass is the kilogram. UK and US use the Avoirdupois system of weights. The Troy system of weights is used in England for gold, silver and precious stones.