Pounds to Kilograms Converter
Result:
Convert between pounds and kilograms with our accurate, free weight conversion calculator. Perfect for fitness tracking, cooking, shipping, and international travel where you need to convert between imperial and metric weight units.
About Weight Conversion
The pound (lb) is a unit of mass used in the imperial system, while the kilogram (kg) is the base unit of mass in the metric system. Our converter uses the exact conversion factor for precise results.
Weight Conversion Formulas
kg = lbs × 0.453592lbs = kg × 2.20462Exact conversion: 1 lb = 0.45359237 kg
Step-by-Step Conversion Examples
Problem: How many kilograms is 150 pounds?
Formula: kg = lbs × 0.453592
Calculation: 150 × 0.453592 = 68.0388 kg
Answer: 150 pounds = 68.04 kilograms
Problem: How many pounds is 75 kilograms?
Formula: lbs = kg × 2.20462
Calculation: 75 × 2.20462 = 165.347 lbs
Answer: 75 kilograms = 165.35 pounds
Quick Conversion Reference
| Pounds (lbs) | Kilograms (kg) |
|---|---|
| 1 | 0.454 |
| 5 | 2.268 |
| 10 | 4.536 |
| 25 | 11.34 |
| 50 | 22.68 |
| 100 | 45.36 |
| 150 | 68.04 |
| 200 | 90.72 |
| Kilograms (kg) | Pounds (lbs) |
|---|---|
| 1 | 2.205 |
| 5 | 11.02 |
| 10 | 22.05 |
| 25 | 55.12 |
| 50 | 110.23 |
| 75 | 165.35 |
| 100 | 220.46 |
| 125 | 275.58 |
Common Weight Conversions
Body Weight
- 120 lbs = 54.4 kg
- 140 lbs = 63.5 kg
- 160 lbs = 72.6 kg
- 180 lbs = 81.6 kg
- 200 lbs = 90.7 kg
Luggage Limits
- 50 lbs = 22.7 kg
- 70 lbs = 31.8 kg
- 44 lbs = 20 kg
- 88 lbs = 40 kg
- 110 lbs = 50 kg
Fitness Equipment
- 45 lbs = 20.4 kg (Olympic bar)
- 25 lbs = 11.3 kg
- 35 lbs = 15.9 kg
- 45 lbs = 20.4 kg
- 55 lbs = 24.9 kg
Pounds vs Kilograms: Key Differences
| Aspect | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| System | Imperial/US Customary | Metric (SI) |
| Countries | USA, UK (partially) | Worldwide standard |
| Size | Smaller unit | Larger unit |
| Conversion | 1 lb = 0.453592 kg | 1 kg = 2.20462 lbs |
| Usage | Body weight, food (US) | Scientific, international |
Frequently Asked Questions
The exact conversion factor is 1 pound = 0.45359237 kilograms. This is defined by international agreement and is exact, not an approximation.
The choice depends on historical measurement systems. Most countries adopted the metric system (kilograms) for standardization, while the United States continues to use the imperial system (pounds) for everyday measurements.
Our converter uses the exact conversion factor (0.45359237) and provides results accurate to 6 decimal places, making it suitable for all practical applications including scientific calculations.
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