Weight Converter — 13 Units, Live Conversion
Type a value in any field and every other weight unit updates instantly. Kilograms, pounds, stone, ounces, tonnes, carats, grains, and more — all in one place.
How to use this tool
- 1Find the unit you know
Locate the input field for the unit you have — for example, kilograms (kg) or pounds (lb). Or use a quick-preset button for common starting points.
- 2Type the value
Enter your number into the field. All 12 remaining unit fields update instantly as you type — no button click needed.
- 3Copy the result
Click the copy button next to any converted value to copy it to your clipboard. Use Clear All to reset everything.
Metric vs imperial weight
The metric system
The metric system uses the kilogram (kg) as its base unit of mass, defined by the International Bureau of Weights and Measures. It scales cleanly by powers of ten: 1 kg = 1,000 g = 1,000,000 mg. The metric tonne (1,000 kg) is standard for freight and industry worldwide. Most countries adopted metric units in the 19th and 20th centuries.
The imperial system
Imperial and US customary systems use pounds (lb), ounces (oz), and stone (st). One pound equals 16 ounces, and one stone equals 14 pounds. The US short ton (2,000 lbs) differs from the imperial long ton (2,240 lbs). The United States, Liberia, and Myanmar are the only countries that have not officially adopted the metric system.
When to use which
Science, medicine, and international trade use metric exclusively. Body weight in the UK is commonly expressed in stone and pounds, while the US uses pounds. Precious stones use carats (1 ct = 0.2 g). Ammunition and pharmacy historically use grains (1 grain = 64.8 mg). This tool handles all of them.
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