A recipe in ounces, a parcel limit in kilograms, a body weight in stone — the number is useless until it is in the unit the other person uses. This free weight converter switches between grams, kilograms, ounces, pounds, stone and tonnes instantly, anchored to the exact definition of the pound. Everything runs in your browser, so nothing is uploaded and no signup is needed.
How to use this weight converter
Three quick steps — value, units, result.
Type the number you have, such as 70, 150 or 2.5.
Pick from grams, kilograms, ounces, pounds, stone or tonnes on each side.
The converted weight appears at once, so a luggage limit or a recipe amount is checked in seconds.
What makes this weight converter safe for parcels, recipes and forms
Built to be free, private, and exact — right in your browser.
A pound is exactly 0.45359237 kilograms, so every conversion in the tool is derived from a definition, not an approximation.
One stone is exactly 14 pounds (6.35029 kilograms), the unit still used for body weight in the UK and Ireland.
The tool uses the everyday avoirdupois ounce of 28.3495 grams; it does not mix in fluid ounces, which measure volume, or troy ounces, which are for precious metals.
A metric tonne is 1,000 kilograms while a US short ton is 2,000 pounds, so the tool keeps them as separate units rather than one vague ton.
Weight Converter FAQs
Short, direct answers to the questions readers ask most.
About 2.20462 pounds. For a quick estimate multiply by 2.2, but use the exact factor for anything that matters.
One everyday ounce is 28.3495 grams, and one pound holds exactly 16 of them.
Exactly 14 pounds, or 6.35029 kilograms.
No, and no converter honestly can on its own. A fluid ounce is a volume, so the weight depends on the liquid; only water gives a near one-to-one answer.
No. A metric tonne is 1,000 kilograms (2,204.62 pounds), while a US short ton is 2,000 pounds (907.18 kilograms).
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