Common Weight Units Explained
- Kilogram (kg): The SI base unit of mass. 1 kg = 1,000 grams. Used globally for body weight, food, and commerce.
- Gram (g): 1/1,000 of a kilogram. Used for small items — food portions, medicine, jewelry.
- Pound (lb): Used in the USA and UK. 1 lb = 453.59 grams = 0.4536 kg.
- Ounce (oz): 1 oz = 28.35 grams = 1/16 pound. Used in cooking (especially US recipes).
- Stone (st): UK unit. 1 stone = 14 pounds = 6.35 kg. Commonly used for body weight in Britain and Ireland.
- Metric Tonne (t): 1 tonne = 1,000 kg. Used for large-scale weights — vehicles, cargo, commodities.
- Milligram (mg): 1/1,000 gram. Used in medicine and pharmacy for drug doses.
- Microgram (μg): 1/1,000 milligram. Used in scientific and pharmaceutical contexts.
Quick Conversion Reference
- 1 kg = 2.20462 pounds (lbs)
- 1 lb = 0.453592 kg = 453.592 grams
- 1 oz = 28.3495 grams = 0.0625 lbs
- 1 stone = 14 lbs = 6.35029 kg
- 1 tonne = 1,000 kg = 2,204.62 lbs
How to Convert Weight Online
1Open the Weight Converter tool.
2Type a value in any unit field — kilograms, pounds, ounces, etc.
3All other units update automatically and simultaneously.
4Read your converted values instantly — no calculation needed.
💡 Fitness Tip: If your gym scale shows weight in kilograms but you think in pounds — just type your kg weight in the kg field and read the lbs value instantly. 70 kg = 154.3 lbs.
FAQ
What's the difference between mass and weight?
Technically, mass (kg) is constant regardless of gravity, while weight is a force (measured in Newtons). In everyday usage, "weight" in kg or lbs actually refers to mass. Our converter uses the common definition (mass).
Why does the UK use both kg and stone?
The UK officially adopted metric (kg) for trade, but stone remains culturally dominant for personal weight. Most British people know their body weight in stone and pounds, not kilograms.