Strictly speaking, these are mass units. "Weight" colloquially means mass on Earth and is what the tool computes.

How are pounds defined?

The international avoirdupois pound is exactly 0.45359237 kilograms — that's what we use.

1 stone = 14 pounds ≈ 6.35 kg. It is still used commonly for body weight in the UK.

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Weight Converter

Convert weight units instantly: milligrams, grams, kilograms, metric tons, ounces, pounds, stones, and US/UK tons.

Milligrams (mg)

Grams (g)

Kilograms (kg)

Metric tons

Ounces (oz)

Pounds (lb)

Stones (UK)

US tons (short)