About this calculator

Use the weight & mass converter to convert weight and mass between 6 units instantly. Enter a value in any unit; every other unit updates automatically. Conversions use exact SI definitions where they exist and standard internationally accepted factors otherwise.

Frequently asked questions

How many grams in a pound?

1 pound = 453.59237 grams exactly.

Stone to kg?

1 stone = 6.35029318 kg.

What does the Weight & Mass Converter do?

Convert weight and mass between every common unit. Free, instant, accurate. Use the weight & mass converter to convert weight and mass between 6 units instantly. Enter a value in any unit; every other unit updates automatically. Conversions use exact SI definitions where they exist and standard internationally accepted factors otherwise.

Is the Weight & Mass Converter free to use?

Yes. Every calculator on Calcora is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Weight & Mass Converter?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified unit converters professional before committing to a purchase or a job.

What inputs does the Weight & Mass Converter need?

Enter values for: Value. Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Weight & Mass Converter on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcora.