Convert pounds to kilograms using the exact international conversion factor. Enter any pound value to receive an accurate kilogram result instantly online for free today.
Converted value = Source value × Conversion factor
For affine conversions such as temperature, an offset is also applied.The tool applies the relevant factor or temperature offset to the source value. Currency outputs require a current exchange-rate source, while cooking volume-to-weight conversions can vary by ingredient density and measuring method.
Use the Pounds to Kilograms Converter to convert a mass from pounds (lb) to kilograms (kg). One pound is exactly equal to 0.45359237 kilograms. Enter the number of pounds in the calculator to receive the equivalent value in kilograms. For a quick manual conversion, multiply the pounds value by 0.45359237.
To convert pounds to kilograms, multiply the mass in pounds by 0.45359237.
Conversion factor: 1 lb = 0.45359237 kg
The factor 0.45359237 is exact. However, converted results are often rounded to two or three decimal places for easier use.
Kilograms = Pounds × 0.45359237
Using unit abbreviations, the formula is:
kg = lb × 0.45359237
For a quick estimate, multiply pounds by 0.454. Use the exact conversion factor when accuracy is important.
Convert 150 pounds to kilograms:
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.45 kg |
| 2 lb | 0.91 kg |
| 5 lb | 2.27 kg |
| 10 lb | 4.54 kg |
| 20 lb | 9.07 kg |
| 25 lb | 11.34 kg |
| 30 lb | 13.61 kg |
| 40 lb | 18.14 kg |
| 50 lb | 22.68 kg |
| 60 lb | 27.22 kg |
| 70 lb | 31.75 kg |
| 80 lb | 36.29 kg |
| 90 lb | 40.82 kg |
| 100 lb | 45.36 kg |
| 120 lb | 54.43 kg |
| 140 lb | 63.50 kg |
| 150 lb | 68.04 kg |
| 160 lb | 72.57 kg |
| 180 lb | 81.65 kg |
| 200 lb | 90.72 kg |
| 220 lb | 99.79 kg |
| 250 lb | 113.40 kg |
| 300 lb | 136.08 kg |
Table results are rounded to two decimal places. The converter may display additional decimal places depending on the entered value.
The pound is a unit of mass used primarily in the United States customary system and the British imperial system. Its standard symbol is lb, while lbs is commonly used informally for plural values. One international avoirdupois pound is defined as exactly 0.45359237 kilograms.
The kilogram is the base unit of mass in the International System of Units. Its symbol is kg. Kilograms are widely used internationally for body mass, shipping weights, food quantities, scientific measurements, and commercial applications. One kilogram is approximately equal to 2.20462 pounds.
Multiply the number of pounds by 0.45359237. The formula is kg = lb × 0.45359237.
One pound is exactly equal to 0.45359237 kilograms, or approximately 0.454 kg when rounded to three decimal places.
Multiply 100 by 0.45359237. The result is 45.359237 kilograms, which rounds to 45.36 kg.
Two hundred pounds equals 90.718474 kilograms, or approximately 90.72 kg.
Pounds and kilograms are treated as units of mass in this conversion. In everyday language, people often call these values weight. Pound-force is a separate unit of force and should not be converted to kilograms as though it were mass.
Multiply kilograms by approximately 2.2046226218. The reverse formula is lb = kg × 2.2046226218.
Enter a known source value, confirm the direction of conversion and compare the result with the level of precision required. Keep extra decimal places for technical work and round only at the final step.
For a fast estimate, divide the number of pounds by 2.2. This produces a result close to the exact conversion, but it may differ slightly because one kilogram equals approximately 2.20462 pounds.
For example, 110 pounds divided by 2.2 equals approximately 50 kilograms. Using the exact factor gives 49.895 kilograms.
The international avoirdupois pound is legally defined as exactly 0.45359237 kilograms. The conversion factor does not change, but the displayed result may vary depending on rounding.
Keep the unrounded value during calculations and round only the final result to reduce accumulated rounding errors.
| Pounds | Exact Calculation | Rounded to 2 Decimals | Rounded to Whole Kilograms |
|---|---|---|---|
| 25 lb | 11.33980925 kg | 11.34 kg | 11 kg |
| 50 lb | 22.6796185 kg | 22.68 kg | 23 kg |
| 100 lb | 45.359237 kg | 45.36 kg | 45 kg |
| 150 lb | 68.0388555 kg | 68.04 kg | 68 kg |
| 200 lb | 90.718474 kg | 90.72 kg | 91 kg |
| Feature | Pound | Kilogram |
|---|---|---|
| Symbol | lb | kg |
| Measurement | Mass | Mass |
| System | U.S. customary and imperial | International System of Units |
| Equivalent value | 1 lb = 0.45359237 kg | 1 kg ≈ 2.20462 lb |
A pounds-to-kilograms result should be less than half of the original pound value. For example, 100 pounds is approximately 45.36 kilograms. To check the conversion, multiply the kilogram result by 2.20462. The answer should be close to the original number of pounds, allowing for rounding.