CONVERSION · EN
lb to kg — pounds to kilograms
Convert pounds (lb) to kilograms (kg) using the exact definition of the international avoirdupois pound.
Guide
Formula
kg = lb × 0.45359237
The international avoirdupois pound is defined as exactly 0.45359237 kilogram. This exact relationship is used directly rather than an approximation rounded to 0.45 kg.
Note : This page converts the avoirdupois pound of mass (lb), not pound-force (lbf).
Example : 180 lb
Common conversions
Display rounded to at most 6 decimal places.
| lb | kg |
|---|---|
| 1 | 0.453592 |
| 5 | 2.267962 |
| 10 | 4.535924 |
| 50 | 22.679619 |
| 100 | 45.359237 |
| 150 | 68.038856 |
| 200 | 90.718474 |
Definition sources
Measurement
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Calculation details and sources are available below the result.
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Useful conversions
Approximate fraction
This approximation certifies neither a part nor an instrument’s accuracy.
Fractions and precision
| Step | Fraction | Error in mm | Limit |
|---|
Error = approximate fraction − requested measurement. Exact comparison before display rounding.
A list
One measurement per line. The unit is detected independently on every line, including common typos.
Applies only to numbers without a unit. Written units always take precedence.
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| Line | Original | Detected | To | Result | Status |
|---|