Weight & Mass Converter
Convert weight and mass between kilograms, grams, milligrams and tonnes, and pounds, ounces and stone. Type a value and see it across every unit at once, with exact factors. A free, instant weight converter that runs in your browser.
- Exact, standard factors
- 100% free
- No sign-up, no app
- Instant as you type
- Works offline after first load
1 kg in every unit
How to use it
- 1
Enter a value
Type the number you want to convert. The result updates as you type, with no button to press.
- 2
Pick the units
Choose what you are converting from and to. Swap them with one click if you need the reverse.
- 3
Read or copy
See the exact result, plus a table of your value in every unit. Copy any line you need.
When it comes in handy
Cooking and recipes
Convert grams to ounces, or pounds to kilograms, when a recipe uses units your scale does not.
Health and fitness
Switch a body weight between kilograms, pounds and stone, depending on which a chart or app expects.
Shipping and parcels
Convert a package weight to the unit a courier or customs form asks for.
Instant, exact & 100% in your browser
The conversion runs right here in your browser using exact, standard factors. Nothing you type is sent to a server, there is no sign-up and no limit, and once the page has loaded it keeps working even with no connection.
Frequently asked questions
- How many pounds are in a kilogram?
- One kilogram is about 2.20462 pounds, based on the exact definition of a pound as 0.45359237 kilograms. So to go from kilograms to pounds you multiply by roughly 2.205, and to go back you divide by it.
- What is a stone in pounds and kilograms?
- One stone is 14 pounds, which is about 6.35 kilograms. Stone is still widely used for body weight in the UK and Ireland, where a weight is often given as a number of stone plus a number of pounds.
- How accurate are the conversions?
- Each conversion uses the exact, internationally defined factor for the unit, not a rounded approximation, so the maths is precise. The result is shown to several significant figures and rounded only for display. For everyday and most professional use, the figures are exact to well beyond the precision you need.
- Does this work offline and is anything sent to a server?
- The conversion runs entirely in your browser, so nothing you type is sent anywhere, and once the page has loaded it keeps working with no connection. There is no sign-up and no limit on how many conversions you make.