Convert any weight between milligrams, grams, kilograms, tonnes, ounces, pounds and stone. Type a number and the result appears immediately, together with the formula and a table showing the same weight in every unit.
Use it for body weight, recipes, parcel and luggage limits, gym plates or shipping freight. The converter uses the legal definition of the pound (exactly 0.45359237 kg), so the answers are exact to six significant digits.
How to use the Weight Converter tool
- Type the number you want to convert in the Value box, for example 70 with kilograms selected.
- Pick the unit you have in From and the unit you need in To.
- Read the result instantly in large type, with the exact formula used shown underneath.
- Open All weight units to see the same value in every unit at once, or press ⇄ to swap the direction.
- Use Copy result to paste the converted number into a document, spreadsheet or message.
Why use ToolOrca Weight Converter
- Seven units from milligrams to tonnes
- Exact pound definition: 0.45359237 kg
- Stone for UK and Irish body weight
- All-units table at a glance
- Instant results, no button to press
- Free and private, nothing uploaded
How weight conversion works
All weights are converted through the kilogram. One pound is exactly 0.45359237 kg, an ounce is one sixteenth of a pound (28.349523125 g) and a stone is 14 pounds (6.35029318 kg). Metric units simply step by 1,000: 1,000 mg = 1 g, 1,000 g = 1 kg and 1,000 kg = 1 tonne.
Worked example: 70 kg ÷ 0.45359237 = 154.324 lb. Going the other way, 150 lb × 0.45359237 = 68.0389 kg.
Weight versus mass
Strictly speaking, kilograms and pounds measure mass, the amount of matter in an object, while weight is the force gravity puts on it. In everyday life the two words mean the same thing, and every bathroom scale, kitchen scale and luggage limit uses these units.
Frequently asked questions
How many pounds are in a kilogram?
One kilogram is 2.20462 pounds. A quick estimate is to double the kilograms and add 10%.
How many grams are in an ounce?
One avoirdupois ounce is exactly 28.349523125 grams, usually rounded to 28.35 g.
How much is 10 stone in kg and pounds?
10 stone is 140 pounds, which is 63.5029 kg.
Is a tonne the same as a ton?
No. A metric tonne is 1,000 kg (2,204.62 lb). A US short ton is 2,000 lb (907.185 kg) and a UK long ton is 2,240 lb (1,016.05 kg).