Weight & Mass Converter

Convert weight and mass between metric and imperial units — kilograms, grams, pounds, ounces, stones and tonnes.

100% client-side · nothing is uploaded

Loading tool…

How to use the Weight

Enter the number you want to convert in the Value field.
Pick the unit you're converting From and the unit you want To.
Read the converted result, or use ⇅ to swap the two units.
Check the All units table to see your value expressed in every supported unit at once.

Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.

About Weight

Mass vs. weight

In everyday use weight means mass — what scales report and what recipes and shipping use. This tool converts mass units.

Metric and imperial

1 kilogram = 1000 grams = 2.20462 pounds. 1 pound = 16 ounces = 0.45359237 kg exactly. 1 stone = 14 pounds.

Everyday uses

Recipe ingredients, parcel weights, body weight between kg and stones/pounds, and lab measurements.

Frequently asked questions

How many pounds in a kilogram?

About 2.20462 pounds.

What is a stone?

14 pounds (about 6.35 kg), used in the UK for body weight.

Are results exact?

They use the exact international pound definition, rounded for display.