Is it safe to use the Weight Converter online?

Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.

Are my files uploaded to a server?

No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.

Do I need to sign up or pay?

No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.

Is this mass or weight?

Strictly mass — what you'd measure on a balance scale. On Earth, mass and weight (force) numerically coincide at standard gravity.

How is 1 stone defined?

1 stone = 14 pounds = 6.35029318 kg. International Avoirdupois pound used throughout.

Weight Converter

Live conversion between every common weight (mass) unit: milligrams, grams, kilograms, tonnes, ounces, pounds, stone, US tons, UK tons. Edit any unit, the rest update.

Features

9 units displayed at once
Edit any cell to drive every other
Both US (short) and UK (long) tons shown
Stone-and-pounds breakdown for body weight (UK style)
Copy any value with one click

How to weight converter

Type a value — In any unit you know — other rows update live.
Pick precision — 3, 6, or 9 significant figures.
Copy — Click any cell to copy.

Frequently asked questions

Is it safe to use the Weight Converter online?: Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.
Are my files uploaded to a server?: No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.
Do I need to sign up or pay?: No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.
Is this mass or weight?: Strictly mass — what you'd measure on a balance scale. On Earth, mass and weight (force) numerically coincide at standard gravity.
How is 1 stone defined?: 1 stone = 14 pounds = 6.35029318 kg. International Avoirdupois pound used throughout.