Convert between metric and imperial mass units — from micrograms and milligrams up through kilograms and tons.
Scientifically, mass is the amount of matter (kilograms) while weight is force under gravity. Everyday converters treat “weight” labels as mass for cooking, shipping, and body measurements.
Precious metals use troy ounces (~31.1035 g). Grocery and body-weight ounces are avoirdupois (~28.35 g). Pick the matching unit label in the list to avoid costly mix-ups.
Yes for SI-linked definitions used in this tool (for example the international pound). Display rounding may shorten very large or tiny values for readability.