What Is a Weight Calculator?
This weight converter instantly converts between pounds, kilograms, ounces, grams, stone, and US tons — useful for cooking, fitness, shipping, or any task requiring weight unit conversion.
How to Use the Weight Calculator
- Enter the weight value.
- Select the unit you're converting from.
- See the value instantly converted to all other supported units.
Weight Conversion Reference
| Unit | Equivalent |
|---|---|
| 1 pound (lb) | 0.453592 kilograms |
| 1 kilogram (kg) | 2.20462 pounds |
| 1 pound (lb) | 16 ounces |
| 1 stone | 14 pounds |
| 1 US ton | 2,000 pounds |
Worked Example
Example: Converting 150 lb
150 lb = 68.04 kg
150 lb = 2,400 oz
150 lb ≈ 10.71 stone
Common Uses for Weight Conversion
- Cooking and baking recipes that use different measurement systems.
- Tracking body weight when switching between US and metric units.
- Shipping and freight calculations.
- Sports and fitness contexts (weightlifting plates, boxing weight classes, etc.).
Common Mistakes to Avoid
- Confusing US customary units with UK/Imperial units (a UK "stone" is 14 lb, distinct from US tons).
- Mixing up mass (kg, lb) with volume or other unrelated measurements.
- Rounding intermediate conversion steps too early, which can introduce small errors.
Frequently Asked Questions
Multiply pounds by 0.453592 to get kilograms, or divide by 2.20462.
One stone equals 14 pounds — a unit still commonly used for body weight in the UK and Ireland.
There are 16 ounces in 1 pound.
A US ton (short ton) is 2,000 pounds, while a metric ton (tonne) is 1,000 kilograms (about 2,204.6 pounds) — they're not the same.
This calculator uses standard, internationally recognized conversion factors and should be accurate to several decimal places.