UnitConPounds to Kilograms Converter
Convert pounds to kilograms for international health records, package weights, and scientific measurements. This is essential for Americans working with metric systems or interpreting international weight references.
Formula
Divide pounds by 2.20462 to get kilograms. To reverse, multiply kilograms by 2.20462 to get pounds.
Quick reference
| Pound (lb) | Kilogram (kg) |
|---|---|
| 100 | 45.35924 |
| 110 | 49.89516 |
| 120 | 54.43108 |
| 130 | 58.96701 |
| 140 | 63.50293 |
| 150 | 68.03886 |
| 160 | 72.57478 |
| 170 | 77.1107 |
| 200 | 90.71847 |
| 250 | 113.3981 |
About these units
Pound
The avoirdupois pound (used for most goods) is one of several historical pound definitions. Fixed at exactly 0.45359237 kg in 1959 by international agreement, it replaced slightly differing US and UK pound standards.
Kilogram
The kilogram is the SI base unit of mass, now defined via the Planck constant since 2019. Its human-scale size — roughly the mass of a liter of water — makes it practical for everyday weighing worldwide.
Frequently asked questions
150 ÷ 2.20462 ≈ 68.04 kg.
Divide by 2 and subtract 10%. For 150 lbs: 150 ÷ 2 = 75, minus 10% = 67.5 kg (actual: 68.04).
The US retained the customary system from its colonial British roots and never fully adopted the metric system despite legislation in 1975 encouraging voluntary conversion.