Pounds to Kilograms Converter

Multiply the weight in pounds by 0.45359237, so kg = lb times 0.45359237. For example, 10 lb becomes 10 times 0.45359237, which the converter shows as 4.535924 kg.

Enter your weight in the pounds box and read the kilograms. A 150 lb person is shown as 68.038856 kg, and a 200 lb person as 90.718474 kg.

As displayed here, 1 lb is 0.453592 kg, 5 lb is 2.267962 kg, 10 lb is 4.535924 kg, 25 lb is 11.339809 kg, 50 lb is 22.679619 kg and 100 lb is 45.359237 kg.

The factor is exact: since 1959 one pound has been defined as precisely 0.45359237 kilograms. The tool computes at full precision and only rounds the shown number to six decimal places for readability.

One kilogram is about 2.204623 pounds as shown in the reverse direction. To do it by hand, divide kilograms by 0.45359237, or multiply by 2.2046226218.

Weights are rounded to six decimal places so the result stays precise without a long trailing string of digits. Trailing zeros are dropped, which is why 100 lb reads as 45.359237 kg rather than 45.359237000000 kg.

Yes. You can enter values like 12.5 or 2500 and the kilograms update instantly. Because the math is a single multiplication, there is no practical size limit short of the number range your browser supports.

The pound is a unit of the imperial and US customary systems, common in the United States. The kilogram is the base unit of mass in the metric system used almost everywhere else. One pound is a little under half a kilogram.

No. The conversion runs entirely in your browser with client-side JavaScript, so the weights you enter never leave your device and nothing is uploaded.