Free Online Weight Converter

1. Choose a From unit and a To unit from the dropdowns.
2. Enter a value; the converted result and ratio appear instantly.
3. Swap the direction with the swap button to confirm the reverse.

The kilogram is the SI base unit of mass, defined since 2019 in terms of Planck's constant. The pound used in everyday life is the international avoirdupois pound, fixed at exactly 0.45359237 kg in 1959. Grams, ounces, stones and tonnes all derive from those two anchors.

Weight conversion is everywhere outside a single-region kitchen: a UK baker reading a US cookbook converts ounces to grams, a powerlifter reading European meet results converts kilos to pounds, a shipping clerk balances tonnes and short tons, and a postal customer fills the customs declaration in both. Mass here means weight in the colloquial sense, which is what scales report on Earth.

This converter handles every common pair through a kilogram pivot. For body-weight specifically, the dedicated kg-to-lbs tool is faster.