How to convert pounds to kilograms
To convert pounds to kilograms, multiply the number of pounds by 0.45359237. This factor is exact because the international avoirdupois pound is legally defined as exactly 0.45359237 kilograms.
Pounds to kg formula
kilograms = pounds × 0.45359237
Example: convert 150 pounds to kg
- Start with the weight: 150 lb.
- Multiply by the exact factor: 150 × 0.45359237.
- The result is 68.0388555 kg, usually rounded to 68.04 kg.
Pounds to kg conversion chart
Common pound values converted to kilograms and rounded to two decimal places.
| Pounds (lb) | Kilograms (kg) | Approximate kg |
|---|
Common pounds to kilograms conversions
10 pounds to kg
10 lb = 4.5359 kg
50 pounds to kg
50 lb = 22.6796 kg
100 pounds to kg
100 lb = 45.3592 kg
200 pounds to kg
200 lb = 90.7185 kg
Understanding pounds and kilograms
What is a pound?
The pound is a unit of mass used mainly in the United States and in some everyday measurements in the United Kingdom. Its symbol is lb, from the Latin word libra. One international avoirdupois pound equals exactly 16 ounces or 0.45359237 kilograms.
What is a kilogram?
The kilogram is the SI base unit of mass and is used in science, commerce, health, travel, and daily life around the world. Its symbol is kg. One kilogram is approximately 2.20462 pounds.
When is this conversion useful?
You may need to convert lb to kg when checking body weight, gym equipment, luggage allowances, shipping labels, recipes, product specifications, or medical information. For health or scientific use, retain enough decimal places for the required level of accuracy.
Frequently asked questions
How do you convert pounds to kilograms?+
Multiply pounds by 0.45359237. For example, 10 lb × 0.45359237 = 4.5359237 kg.
How many kilograms are in one pound?+
One pound contains exactly 0.45359237 kilograms, or about 0.454 kg when rounded to three decimals.
Is 1 kg the same as 2.2 lb?+
It is a useful approximation. More precisely, 1 kg equals about 2.20462 lb.
What is 100 pounds in kilograms?+
100 lb equals 45.359237 kg, usually shown as 45.36 kg when rounded to two decimal places.
Why is pound abbreviated as lb?+
The abbreviation comes from libra, the Latin term connected with a balance or scale.