In 1 pounds there are 0.453592 kilograms. Meanwhile in 1 kilograms there are 2.204623 pounds. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Kilograms to Pounds calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert pounds (lb) to kilograms (kg), multiply the pounds value by 0.45359237.
Example:
For clean results, round to 2 decimal places for body weight and most daily needs.
To convert pounds (lb) to kilograms (kg), multiply the number of pounds by 0.45359237.
Formula: kg = lb × 0.45359237
1 pound equals 0.45359237 kilograms.
For quick use, many people round it to 0.45 kg.
1 kilogram equals 2.20462262 pounds.
A common rounded value is 2.2 lb.
A pound is defined as exactly 0.45359237 kilograms by agreement on unit standards. This fixed value keeps weights consistent across countries and systems.
Yes. lb is the symbol for pound, and lbs is the plural form used in writing. The unit stays the same.
A pound is a unit of mass used in the US customary system.
A kilogram is a unit of mass used in the metric system and is the standard unit in most countries.
A simple estimate is to divide pounds by 2.2.
This gives a close result for most everyday weights. For exact results, use 0.45359237.
10 lb × 0.45359237 = 4.5359237 kg.
Rounded to two decimals: 4.54 kg.
100 lb × 0.45359237 = 45.359237 kg.
Rounded to two decimals: 45.36 kg.
50 kg × 2.20462262 = 110.231131 lb.
Rounded to one decimal: 110.2 lb.
The conversion factor never changes. Only the rounding rules may change. Shipping labels may round to a set decimal, while health records may keep more digits.
Use rounding based on your need:
Here are common conversions (rounded to 2 decimals):
For rough work, use 1 lb ≈ 1/2.2 kg.
That means kg ≈ lb ÷ 2.2. It’s a good estimate, but it’s not exact.
In daily use, people say “weight” for both. In science, they measure mass. Pounds and kilograms are units of mass, while weight depends on gravity. For normal use on Earth, the difference doesn’t change the conversion.
Small differences come from rounding. The exact value is 1 lb = 0.45359237 kg, but many sources round it to 0.454 or 0.45.
The Calculate Box tool to convert pounds to kilograms uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a pounds value in the box and have it instantly converted to kilograms.