Weight & Mass Conversion: kg, lb, oz, g — Never Second-Guess Again
Weight and mass are terms often used interchangeably in daily life, but they have distinct scientific meanings. Mass measures the amount of matter in an object; weight is the force of gravity on that mass. On Earth, the difference is negligible for everyday purposes.
The Metric System (SI)
The Imperial/US System
Conversion Formulas
Metric to Imperial: 1 g = 0.035274 oz | 1 kg = 2.20462 lb
Imperial to Metric: 1 oz = 28.3495 g | 1 lb = 453.592 g = 0.453592 kg
Special: Troy Weight (Precious Metals): 1 troy ounce = 31.1035 g (used for gold, silver, platinum)
Quick Conversion Table
Practical Examples
Body Weight: To convert pounds to kg, divide by 2.2. A 70 kg person weighs about 154 lb. In the UK, people often use stone: 70 kg = 11 stone.
Cooking: European recipes use grams; American recipes use cups + ounces. A 500 g flour package is about 17.6 oz. A stick of butter (US) = 113 g.
Fitness: US gym plates are in pounds (45 lb bar); European plates in kg (20 kg bar). An American bench pressing 225 lb is lifting about 102 kg.
Use our kg to lbs Converter for instant weight conversions.
| Unit | Symbol | Equivalent in kg | Common Uses |
|---|
| Milligram | mg | 0.000001 | Medication doses |
|---|---|---|---|
| Gram | g | 0.001 | Cooking, groceries |
| Kilogram | kg | 1 | Body weight, general use |
| Tonne | t | 1000 | Vehicles, industry |
| Unit | Symbol | Equivalent in kg | Common Uses |
|---|
| Ounce | oz | 0.0283495 | Cooking, precious metals |
|---|---|---|---|
| Pound | lb | 0.453592 | Body weight, groceries |
| Stone | st | 6.35029 | Body weight (UK, Ireland) |
| kg | lb | oz | Stone |
|---|
| 0.5 | 1.10 | 17.6 | 0.079 |
|---|---|---|---|
| 1 | 2.20 | 35.3 | 0.157 |
| 5 | 11.0 | 176 | 0.787 |
| 10 | 22.0 | 353 | 1.57 |
| 70 | 154 | 2469 | 11.0 |
| 100 | 220 | 3527 | 15.7 |