Weight & Mass Converter
Convert kilograms (kg), pounds (lbs), ounces (oz), grams (g), stone (st), and tons with exact ratios.
Weight Converter — interactive calculator, computed instantly in your browser.
Weight & Mass Conversion: Kilograms, Pounds, Ounces & Stone
The Standard Mass Equivalency Bridge: Metric vs. Avoirdupois Imperial
Exact Definition: Under the 1959 International Yard and Pound Agreement, exactly 1 pound (avoirdupois) equals $0.45359237\text{ kg}$.
Weight and mass conversion translates physical mass quantities across the metric System of Units (kg, g, tonnes) and the British Imperial / US Customary Avoirdupois system (pounds, ounces, stone, short tons).
1. Universal Mass Conversion Matrix Table
| Unit Name | Symbol | Equivalent in Kilograms (kg) | Equivalent in Pounds (lbs) |
|---|---|---|---|
| Kilogram (Base SI) | kg | 1.0000 kg | 2.20462 lbs |
| Pound (Avoirdupois) | lb / lbs | 0.453592 kg | 1.0000 lb (16 oz) |
| Ounce | oz | 0.0283495 kg | 0.0625 lb (1/16 lb) |
| Stone (UK) | st | 6.35029 kg | 14.0000 lbs |
| Metric Tonne | t | 1,000 kg | 2,204.62 lbs |
🔗 Mass & Density Conversion Tools
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Frequently Asked Questions (Weight Converter)
An Avoirdupois ounce (used for everyday goods) equals 28.3495 grams. A Troy ounce (used exclusively for precious metals like gold and silver) equals 31.1035 grams.
A US Short Ton contains 2,000 pounds (907.18 kg). A British Long Ton contains 2,240 pounds (1,016.05 kg). A Metric Tonne contains 2,204.62 pounds (1,000 kg).