Weight Converter
Convert between kilograms, grams, pounds, and ounces.
Inputs
Allowed range: 0 to 1000000000
Results
How it works
All conversions go through grams as the base unit.
Complete guide
Weight (technically mass) conversions come up constantly when cooking with international recipes, shipping packages, tracking workouts, or interpreting product labels. The metric kilogram is the worldwide scientific standard; the U.S. uses pounds and ounces in everyday life.
Quick reference: 1 kg ≈ 2.205 lb, 1 lb = 16 oz = 453.59 g, 1 oz ≈ 28.35 g. A liter of water weighs almost exactly 1 kg, which makes mental conversion easy when cooking.
Note: 'pound' here means the avoirdupois pound used for everyday goods. The 'troy pound' used for precious metals is different (and lighter) — don't use this calculator to price gold.
Frequently asked questions
- Is weight the same as mass?
- Strictly, no — weight depends on gravity and mass doesn't. In everyday use on Earth they're treated as equivalent.
- Why is 1 pound 0.453592 kg?
- The international avoirdupois pound was defined in 1959 as exactly 0.45359237 kg. All English-speaking countries adopted this standard.
- How precise are the results?
- Each conversion uses exact factors and is shown to 4 decimal places — accurate enough for shipping, cooking, and fitness.
- Can I convert stones?
- Not directly. One stone equals 14 pounds or 6.35 kg if you need to convert manually.