lbs to kg converter

The exact conversion factor

1 pound = 0.45359237 kilograms exactly — this is the internationally defined value set by the 1959 international yard-and-pound agreement, not a rounded approximation. This calculator multiplies your input by that factor and displays the result to two decimal places.

Worked example

50 pounds converts to 50 × 0.45359237 = 22.6796185 kg, which the tool rounds and displays as 22.68 kg. For body weight, 150 lbs converts to 150 × 0.45359237 = 68.0388555, shown as 68.04 kg.

A quick estimate shortcut

For a fast mental approximation, divide pounds by 2.2 — 50 / 2.2 ≈ 22.7 kg, close to the exact 22.68 kg above. That shortcut drifts further from the exact figure as numbers get larger, so it's fine for a rough sense-check but not a substitute for the precise calculation.

Common reference weights

100 lbs = 45.36 kg. 200 lbs = 90.72 kg. A standard airline carry-on weight limit of 22 lbs (often quoted) is about 9.98 kg.