How to convert weight between kg, pounds, grams, ounces and stone

A recipe in ounces, a parcel limit in kilograms, a body weight in stone — weight units are a mess of metric and imperial, and getting the conversion wrong matters. This guide covers the factors that matter and the places people slip up.

The fastest way

Type a value into the Weight Converter, pick its unit, and every other unit — kilograms, grams, milligrams, pounds, ounces, stone and tonnes — updates live. No "convert" button and no second lookup.

The conversions worth knowing

• 1 kg = 1000 g and 1 g = 1000 mg — clean metric steps.
• 1 kg ≈ 2.2046 lb — the one everyone needs; double-and-a-bit for a rough figure.
• 1 lb = 16 oz — the imperial step that catches people out.
• 1 stone = 14 lb ≈ 6.35 kg — UK body-weight unit.
• 1 tonne = 1000 kg — metric, distinct from the US short ton.

Where people trip up

Stone-and-pounds is a two-part figure ("11 st 4 lb" is not 11.4 stone), ounces are 1/16 of a pound not 1/10, and the metric tonne differs from the US ton. The Weight Converter shows every unit at once so you can sanity-check the result instead of trusting one number.

Other units you might need

If you're converting a recipe or a measurement, you'll often need length and temperature too — the Length Converter handles metres/feet/inches and the Temperature Converter handles °C/°F, both the same live, in-browser way.

A note on privacy

The Weight Converter works entirely in your browser — nothing is uploaded — so it's instant and works offline once loaded.

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