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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.