Weight Converter

How Weight Converter works

Convert weight between kilograms, grams, milligrams, tonnes, ounces, pounds and stone. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

Kilogram-based, with two traps

Seven units, all defined as multiples of the kilogram. The metric side is decimal and trivial; the imperial side carries exact but awkward factors, which is where mistakes live.

The first trap is ounces: the avoirdupois ounce of 28.349523125 g is the one used for food and postage. A troy ounce is 31.1034768 g, and precious metals are quoted in troy ounces.

Tonne is not ton

A metric tonne is 1,000 kg. A US short ton is 2,000 lb, which is 907.18 kg — about 10% lighter. A UK long ton is 2,240 lb, or 1,016 kg. Three units, one syllable in common speech.

Shipping documents quote tonnes, US suppliers quote tons, and the difference on a 25-unit shipment is 2.3 tonnes. Always check which one a contract means.

Body weight and cooking

For body weight, the pound and stone are exact and stable. For cooking, grams are more reliable than ounces because most scales read grams and a rounded ounce (28 g) drifts by 1.2% per conversion.

Milligram values matter in dosage, where a factor error is not cosmetic. The factor here is exact; the risk is entering 500 mg as 500 g.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions