Weight Converter
Runs locally in your browser. Nothing leaves your device.Enter one weight and instantly convert it to kilograms, grams, pounds, ounces, stones, tons, and troy and carat units.
Use a comma or period as the decimal separator; do not use thousands separators.
All units
Metric
US & imperial
Troy & gemstones
How it works
- 1
Enter value and source unit
Enter the weight value and choose the source unit from one of the three groups.
- 2
Choose the target unit
Choose the target unit, even from a different group, for example from kilograms to troy ounces.
- 3
Copy the result or swap units
Copy one result or all results at once, or swap the source and target unit for the next conversion.
Good to know
The weight converter converts directly in your browser between three unit groups: Metric, US & imperial, and Troy & gemstones. It converts mass units; the physical force of weight is measured in newtons and is not part of this tool.
Calculation runs locally in the browser. Everyday language often uses “weight” for mass, but physically that is a distinction — this tool converts mass units exclusively.
Typical use cases
Everyday life, shipping, and fitness
Convert kg to lb, grams to ounces, or stones to kilograms, for example for shipping weights, recipes, or fitness and nutrition plans.
Correctly weigh precious metals and gemstones
Use the Troy & gemstones group for gold, silver, or diamonds, since troy ounces and carats are different units than everyday ones.
Convert mass for technical and scientific purposes
Convert precisely between metric and US/imperial mass units, for example for data sheets, lab records, or technical documentation.
Tips for better results
Don't confuse mass and weight-force
This tool converts mass (kg, lb, etc.). The physical force of weight is given in newtons and additionally depends on gravitational acceleration — it is not part of this conversion.
Don't confuse a troy ounce with a regular ounce
A troy ounce (about 31.1 g) used for precious metals is heavier than a regular ounce (about 28.35 g) — important for gold and silver prices.
Features
Three unit groups including Troy & gemstones
Metric, US & imperial, and troy & gemstones are cleanly separated.
Local conversion
Calculation happens directly in the browser, without transmission to a server.
Clear separation of mass and weight-force
A note makes clear that this converts mass and that weight-force in newtons is not included.
Frequently asked questions
Is weight the same as mass?
Colloquially yes, physically no. This tool converts mass units; the weight-force in newtons additionally depends on gravitational acceleration and is not included.
What is a troy ounce?
A troy ounce equals about 31.1035 grams and is used for precious metals such as gold and silver — it is heavier than the regular ounce at about 28.35 grams.
Are my inputs uploaded?
No. Conversion runs entirely locally in the browser.
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