Tool
Weight Converter
Convert between mg, g, kg, tonnes, ounces, pounds, stone and US tons. Live reference table for all units.
Convert weights in three steps
Works in any browser, on any device. No install required.
Enter a weight value
Type any number into the input field.
Select the unit
Choose the source unit — kg, g, lb, oz, stone, and more.
See all conversions
Every weight unit updates simultaneously as you type.
Weight units
All major units
kg, g, lb, oz, stone, mg, metric tons — all in one place.
Live conversion
All values refresh as you type. No submit button needed.
Imperial and metric
Switch freely between imperial and metric weight systems.
About the Weight Converter
Weight conversions are needed daily — for cooking recipes, body weight, postage, gym tracking and international shopping. The metric system uses grams and kilograms while the imperial system uses ounces, pounds and stone. This converter handles all common weight units with a live reference table.
Common uses: converting body weight between kg and lbs, cooking conversions between grams and ounces, understanding parcel weight limits, and comparing nutritional information across countries.
Key relationships: 1 kilogram = 2.205 pounds, 1 pound = 453.6 grams, 1 stone = 14 pounds = 6.35 kg, 1 ounce = 28.35 grams. Body weight in the UK is often discussed in stone and pounds (e.g., 11 st 4 lbs), while medicine and most other countries use kilograms. Nutritional labels in the US list values per ounce while European labels use grams.
Postal and shipping weight limits are almost always in kilograms internationally, but some US carriers quote in pounds. For cooking, American recipes list ingredients in ounces and cups while European recipes use grams. The reference table shows all weight equivalents at once for the value you enter.
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Frequently Asked Questions
How many pounds are in a kilogram?
1 kg = 2.20462 lbs. For quick mental math, multiply kilograms by 2.2.
What is a stone in pounds and kilograms?
1 stone = 14 pounds = 6.35 kg. Used primarily in the UK and Ireland for body weight.
How many grams are in an ounce?
1 oz = 28.3495 grams.
What is the difference between mass and weight?
Mass is the amount of matter in an object, measured in kg. Weight is the gravitational force acting on that mass, measured in Newtons. In everyday use they are treated as the same since we are all on Earth.