Weight Converter
Convert between weight and mass units including kilograms, pounds, grams, ounces, stones, and tons. Supports metric, imperial, and special units with precise calculations for cooking, science, health, and international use.
Weight vs Mass - Important Note
Technically, weight is a force (measured in Newtons) while mass is the amount of matter (measured in kg, lbs). In everyday use, we treat them interchangeably on Earth. This calculator converts mass units but commonly refers to them as "weight" units.
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Popular Weight Conversions
1 kilogram = 2.20462 pounds
1 pound = 0.453592 kg
1 kilogram = 35.274 ounces
1 ounce = 28.3495 grams
1 stone = 14 pounds
1 stone = 6.35029 kg
1000 grams = 1 kilogram
1 metric ton = 1000 kg
Weight Conversion Chart
| Kilograms (kg) | Ounces (oz) | Stones (st) | Pounds (lb) |
|---|---|---|---|
| 10 | 352.74 | 1.5747 | 22.046 |
| 20 | 705.5 | 3.1495 | 44.09 |
| 30 | 1058.2 | 4.724 | 66.14 |
| 40 | 1411 | 6.299 | 88.18 |
| 50 | 1763.7 | 7.874 | 110.23 |
| 60 | 2116.4 | 9.448 | 132.28 |
| 70 | 2469 | 11.023 | 154.32 |
| 80 | 2822 | 12.598 | 176.37 |
| 90 | 3174.7 | 14.173 | 198.4 |
| 100 | 3527.4 | 15.747 | 220.46 |
Understanding Weight Units
Metric System
Based on the gram and kilogram. Simple decimal conversions make calculations easy. Used worldwide in science and most countries.
- 1 kg = 1000 g
- 1 g = 1000 mg
- 1 metric ton = 1000 kg
Imperial System
Used primarily in the US and UK. Based on historical units with more complex conversion factors.
- 1 lb = 16 oz
- 1 stone = 14 lb
- 1 US ton = 2000 lb
- 1 UK ton = 2240 lb
Key Conversion Factors
Exact Legal Definitions
1 lb = 0.45359237 kg (exact)
1 kg = 2.20462262 lb
1 oz = 28.349523125 g
1 stone = 6.35029318 kg
Special Units
- Troy ounce: Used for precious metals (31.1035 g)
- Carat: Used for gemstones (0.2 g)
- Grain: Smallest unit (0.0648 g)
- Atomic mass unit: For atoms and molecules
Common Applications
Cooking & Nutrition
- • Recipe conversions
- • Ingredient measurements
- • Nutritional labels
- • Portion control
- • International recipes
Health & Fitness
- • Body weight tracking
- • Medical dosages
- • BMI calculations
- • Supplement measurements
- • Exercise planning
Science & Industry
- • Laboratory measurements
- • Chemical calculations
- • Material specifications
- • Quality control
- • Research applications
Commerce & Trade
- • Shipping calculations
- • Precious metals trading
- • International trade
- • Product specifications
- • Legal compliance
Important Notes & Tips
Weight vs Mass
- • Mass: Amount of matter (kg, lb, g)
- • Weight: Gravitational force (Newtons)
- • On Earth: 1 kg mass "weighs" 9.8 N
- • Common usage treats them as equivalent
- • Mass stays constant; weight changes with gravity
Precision & Accuracy
- • Use exact conversion factors for critical applications
- • Legal definitions ensure global consistency
- • Metric system simplifies calculations
- • Imperial conversions require more precision
- • Scientific notation for very large/small values