Convert pounds (lb) to kilograms (kg)
Enter a value in pounds and click convert. This tool uses the exact conversion factor: 1 pound = 0.45359237 kilograms.
Why use a pounds to kilos calculator?
A pounds to kilos calculator is useful when you need quick, accurate weight conversions between the imperial and metric systems. In the United States, body weight is often measured in pounds, while many countries, medical forms, fitness plans, and scientific references use kilograms. Instead of estimating mentally, this calculator gives a precise answer in seconds.
Whether you are tracking weight loss progress, reading gym programs, preparing travel documents, or checking shipping weights, converting lb to kg correctly helps avoid confusion.
The exact conversion formula
The conversion formula is straightforward:
Example: if you weigh 180 pounds, then:
180 × 0.45359237 = 81.6466266 kg
Rounded to two decimals, that is 81.65 kg.
Quick mental estimate
If you only need an estimate, divide pounds by 2.2. This is close enough for everyday use:
- 220 lb ≈ 100 kg
- 110 lb ≈ 50 kg
- 165 lb ≈ 75 kg
For medical, technical, or competitive situations, always use the exact conversion factor, which this calculator applies automatically.
Common pounds to kilograms conversions
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 | 0.45 |
| 5 | 2.27 |
| 10 | 4.54 |
| 25 | 11.34 |
| 50 | 22.68 |
| 100 | 45.36 |
| 150 | 68.04 |
| 200 | 90.72 |
| 250 | 113.40 |
| 300 | 136.08 |
When accurate conversion matters most
Health and medical records
Doctors, nurses, and medication calculators often rely on kilograms. Entering pounds incorrectly can affect dosage calculations, so precision matters.
Fitness and strength training
Workout plans may list bodyweight goals in kg, while your scale shows lb. A fast converter helps keep your tracking consistent.
International travel and shipping
Baggage limits and package labels are frequently stated in kilograms. Converting before check-in or shipment can save fees and delays.
Tips for using this lb to kg converter
- Use decimals when needed (example: 132.5 lb).
- Round to 1–2 decimal places for casual use.
- Keep more decimals for technical reports.
- Use the clear button to start a new conversion quickly.
FAQ: pounds to kilos calculator
How many kilos is 1 pound?
1 pound equals exactly 0.45359237 kilograms.
How do I convert kilograms back to pounds?
Use the reverse formula: pounds = kilograms ÷ 0.45359237 (or kilograms × 2.20462262).
Is this calculator accurate?
Yes. It uses the exact international conversion constant and then displays rounded values for readability.
Bottom line
This pounds to kilos calculator gives you a reliable, instant conversion from lb to kg. It is simple enough for daily use and accurate enough for technical needs. Bookmark it for fast weight conversions whenever you need them.