Mass conversion
Pounds to Kilograms (lb to kg)
Turn a scale or package weight in pounds into kilograms. Enter decimal pounds; add any separate ounces to the pound value first.
1 lb ≈ 0.4536 kg — the calculator keeps the stored factor; this summary may be rounded.
A parcel weighing 50 lb
- Starting measurement
- 50 lb
- Converted value (rounded if needed)
- 22.6796 kg
Check whether a package label gives the contents alone or the packed shipping weight. Changing units cannot account for missing packaging weight.
Pounds to Kilograms conversion chart
| pounds | kilograms |
|---|---|
| 1 lb | 0.4536 kg |
| 2 lb | 0.9072 kg |
| 3 lb | 1.3608 kg |
| 4 lb | 1.8144 kg |
| 5 lb | 2.268 kg |
| 6 lb | 2.7216 kg |
| 7 lb | 3.1751 kg |
| 8 lb | 3.6287 kg |
| 9 lb | 4.0823 kg |
| 10 lb | 4.5359 kg |
| 12 lb | 5.4431 kg |
| 15 lb | 6.8039 kg |
| 18 lb | 8.1647 kg |
| 20 lb | 9.0718 kg |
| 25 lb | 11.3398 kg |
| 30 lb | 13.6078 kg |
| 40 lb | 18.1437 kg |
| 50 lb | 22.6796 kg |
| 60 lb | 27.2155 kg |
| 75 lb | 34.0194 kg |
| 100 lb | 45.3592 kg |
How to convert by hand
Reference relationship (display may be rounded)
1 lb = 0.45359237 kg
- Multiply the amount in pounds by the number of kilograms per unit.
- Use the calculator for the stored precision; copying a short displayed factor introduces extra rounding.
- Round the result to suit your measurement, after completing the calculation.
Related conversions
About pounds and kilograms
These are mass conversions, commonly called weight conversions. The same factor works for flour, luggage or metal. Cups and fluid ounces require a volume conversion instead.
Pound
US / ImperialThe avoirdupois pound is exactly 0.45359237 kilograms. Both lb and the informal lbs refer to this unit here.
Commonly used for: US scale readings, luggage allowances and package weights.
Kilogram
Metric (SI)The SI base unit of mass, defined via the Planck constant since 2019. Scales usually describe this as weight.
Commonly used for: Luggage, parcels, body weight and bulk ingredients.
Questions
How do I enter pounds and ounces together?
Divide the ounces by 16, then add that to the pounds. For example, two pounds eight ounces is 2.5 lb. Enter the combined decimal value in the pounds field.
How do I convert kilograms back to pounds?
Enter the value in the kilograms field above to work backwards, or open the Kilograms to Pounds converter. This uses the stored factors rather than dividing by a rounded number copied from the chart.
Why might the chart and calculator show different decimal places?
The chart uses a compact rounded display. The editable calculator can show up to six decimal places and uses the factors or temperature formulas stored in the library. More displayed digits do not make the original measurement more precise.
Precision and source
The calculator uses stored conversion factors and temperature formulas, then rounds the result for display. A short decimal in a chart is not a claim of exactness. For a calculation with several steps, keep as much precision as the original measurement supports and round at the end.
Reference: NIST SP 811 conversion factors. Its alphabetical tables distinguish unit variants and temperature readings from intervals. Published by ToolsNow. Report a conversion problem.
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