Weight Converter
Convert between metric and imperial weight units. Type in one box, the rest update.
Runs in your browser — nothing is sent or saved.
How to convert weight
- Type a value in the box for the unit you have.
- Every other unit updates at the same time.
- Read the answer from the unit you need.
- Clear the box to start over.
The units you can use
The tool covers milligrams, grams, kilograms, and tonnes on the metric side, and ounces, pounds, and stone on the imperial side. Type once and read any of them, so you can move from pounds to kilograms or from grams to ounces in one step.
Exact definitions
One pound is defined as exactly 453.59237 grams, and one stone is 14 pounds. From the pound, one ounce is a sixteenth of a pound. These are fixed values, so the tool converts exactly and only trims the display for long decimals. The ounce here is the weight ounce, not the fluid ounce used for liquids, which is a measure of volume.
Common jobs
Convert a recipe from ounces to grams, a body weight from stone to kilograms, a parcel from pounds to kilograms for a shipping form, or a bulk figure from kilograms to tonnes. Every box updates together, so you can read two units at once.
FAQ
How many grams are in a pound?
Exactly 453.59237. This is the official definition, so the value never changes.
What is a stone in kilograms?
One stone is 14 pounds, which is about 6.35 kilograms. Type a stone value to see the exact figure.
Is the ounce here for weight or liquid?
Weight. The fluid ounce measures volume and is different. This tool handles the weight ounce only.
Are the results rounded?
The math is exact. Only the shown number is trimmed when the decimals run long.
Is my data uploaded?
No. The conversion runs in your browser and nothing is stored.
Which units does the weight conversion cover?
Milligrams, grams, kilograms, tonnes, ounces, pounds, and stone. Type into any box and the rest update, so grams to ounces and kilograms to stone need no separate steps.