Weight Converter 🔒 Your data never leaves your browser.
Convert between mg, g, kg, tonnes, ounces, pounds and stone.
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All units
| Milligrams | ||
| Grams | ||
| Kilograms | ||
| Metric Tons | ||
| Ounces | ||
| Pounds | ||
| Stone | ||
| US Tons |
About this tool
A weight converter turns a value in one mass unit into any other, from milligrams up to metric and US tons. Conversions run through a shared grams-based table, so every unit — including imperial oddities like stone — is exact to the underlying multiplication factor rather than a rounded lookup.
Type a value once and see it converted between the two units you pick, plus a full reference table against every other supported unit at the same time. Everything runs locally in your browser; nothing you enter is uploaded.
Frequently asked questions
What's the difference between a metric tonne and a US ton?
A metric tonne is exactly 1,000 kg (2,204.6 lb). A US (short) ton is 2,000 lb (about 907.18 kg) — noticeably lighter. This tool labels the metric option "Metric Tons" and the US option "US Tons" so you don't accidentally mix them up.