Weight & Mass Converter

Convert between kilograms, pounds, grams, ounces, and other weight and mass units.

Works for any combination of the units above -- every value converts through the same verified base-unit math used on the individual pages.

How Weight & Mass Units Relate

Weight and mass units split the same way: metric units (grams, kilograms) scale by powers of ten, while US customary units (ounces, pounds) trace back to the avoirdupois pound, defined as exactly 0.45359237 kilograms since 1959. Note that "weight" and "mass" are technically different physical quantities, but the terms are used interchangeably in everyday conversion.

All Weight & Mass Converters

Each of these has its own page with the exact formula, a reference table, and answers to common questions.

Kilogram to Pound Pound to Kilogram Gram to Ounce Stone to Pound Gram to Kilogram Kilogram to Gram

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