Weight Converter
Convert between ounces, pounds, grams, kilograms, stone, and metric/short tons instantly. Includes common conversions table, troy ounce note, and practical examples.
Formulas, assumptions, and rounding are documented in our calculator methodology.
Enter a value in any field — all other fields update instantly.
All values use internationally accepted conversion factors.
Common Weight Conversion Table
Pounds ↔ kg: 1 lb = 0.4536 kg | 5 lb = 2.268 kg | 10 lb = 4.536 kg | 50 lb = 22.68 kg | 100 lb = 45.36 kg | 150 lb = 68.04 kg | 200 lb = 90.72 kg. Oz ↔ grams: 1 oz = 28.35 g | 4 oz = 113.4 g | 8 oz = 226.8 g | 16 oz (1 lb) = 453.6 g. Kg ↔ lbs: 1 kg = 2.205 lb | 5 kg = 11.02 lb | 10 kg = 22.05 lb | 100 kg = 220.5 lb.
Weight Units Overview
Metric: milligrams (mg), grams (g), kilograms (kg), metric tons (1,000 kg). US customary: ounces (oz), pounds (lb), short tons (2,000 lb). UK: stone (14 lb). Precious metals: troy ounce (31.1 g), troy pound (12 troy oz). For body weight, the US uses lbs, the UK uses stone and lbs, and most other countries use kg.
Troy Ounce vs. Avoirdupois Ounce
The everyday ounce is the avoirdupois ounce (28.35 g), used for food, postal, and general weight. The troy ounce (31.1035 g) is used only for precious metals — gold, silver, platinum, and palladium. If you buy a 1 oz gold coin, that is 1 troy oz = 31.1 g, not 28.35 g. Precious metal prices are always quoted per troy ounce.
Practical Uses for Weight Conversion
Cooking: recipes from different countries use different weight systems — convert grams to ounces for US recipes or vice versa. Fitness: most gym equipment in the US uses lbs; most international equipment uses kg. International shipping: package weight limits are often in kg for international carriers. Precious metals: gold and silver are priced per troy ounce globally.
Frequently Asked Questions
- One kilogram equals approximately 2.20462 pounds. To convert kg to lbs, multiply by 2.20462. To convert lbs to kg, divide by 2.20462 (or multiply by 0.453592).
- One avoirdupois ounce (the standard ounce used for food and everyday weight) equals approximately 28.3495 grams. One pound = 16 ounces = 453.592 grams.
- A regular (avoirdupois) ounce = 28.3495 grams. A troy ounce = 31.1035 grams — about 10% heavier. Troy ounces are used exclusively for precious metals (gold, silver, platinum). When buying or selling bullion, always confirm whether the weight is in troy or avoirdupois ounces.
- One stone = 14 pounds = 6.35029 kg. Stone is used as a body weight unit mainly in the UK and Ireland. For example, a person weighing 154 lbs = 11 stone, or approximately 69.9 kg.
- Mass is the amount of matter in an object (measured in kg or grams). Weight is the force gravity exerts on that mass (measured in newtons). On Earth's surface, they are effectively interchangeable for everyday use — a 1 kg mass weighs approximately 9.81 N.