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Weight Converter
Convert mass between metric and imperial units — from milligrams to metric tons.
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How to Use This Converter
Type a value in either box and pick the units. The other box updates instantly. Use the swap button to reverse the direction.
- All 10 units are supported in both directions.
- Results update live as you type — no button to press.
- Values are formatted for readability while staying precise.
Frequently Asked Questions
How do I convert pounds to kilograms?
Divide by 2.20462. One pound is exactly 0.45359237 kg.
What is the difference between US and UK tons?
A US (short) ton is 2,000 lb = 907.185 kg. A UK (long) ton is 2,240 lb = 1,016.05 kg.
What is a troy ounce?
A troy ounce (31.1 g) is used for precious metals and is slightly heavier than a regular ounce (28.35 g).
Is stone still used?
Yes — commonly in the UK and Ireland for body weight. One stone = 14 lb.
Practical Example
Convert 150 pounds to kilograms. Because 1 pound = 0.45359237 kg exactly, 150 × 0.45359237 = 68.04 kg.
- In ounces: 150 × 16 = 2,400 oz
- In stone: 150 ÷ 14 = 10.71 st
- Formula: pounds × 0.45359237 = kilograms
What Your Results Mean
- Kilograms (kg) — the SI base unit of mass.
- Pounds (lb) — exactly 0.45359237 kg; 16 oz per pound.
- Stone (st) — 14 lb, still used for body weight in the UK and Ireland.
- Troy ounce — 31.1 g, slightly heavier than a regular ounce (28.35 g), used for precious metals.
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