LBS to KG Converter

Convert pounds to kilograms (lb to kg)

To convert pounds to kilograms, multiply the value in pounds by 0.45359237. Use it to read US scales, gym plates, shipping weights and baby weights in kilograms. This lbs to kg converter works both ways: type pounds or kilograms into either box above and the other box, the worked formula and the chart below update as you type.

The pound (lb) is defined as exactly 0.45359237 kilograms by the 1959 international agreement. Its abbreviation comes from the Roman libra. Pounds are used for body weight in the US and, alongside stones, in the UK, and for groceries, gym weights and parcels in the US. One pound is 0.453592 kilograms.

The kilogram (kg) is the SI base unit of mass. Since 2019 it has been defined through the Planck constant instead of a platinum-iridium cylinder kept near Paris. Going the other way, one kilogram equals 2.20462 pounds. Kilograms are used for body weight, groceries, luggage allowances and shipping in almost every country.

How to convert lbs to kg with this tool

1. Type a number into the Pounds (lb) box — it starts at 150 lb as an example.
2. Read the answer in the Kilograms (kg) box and in the result panel, which also shows the formula with your number.
3. To go the other way, type into the kilograms box, or press the swap button to open the KG to LBS converter with your value carried over.
4. Choose how many decimal places you want, or tap a quick value such as 5 lb, 10 lb, 50 lb.
5. Press Copy result to paste the conversion into a message, spreadsheet or note.

LBS to KG converter features

LBS to KG formula

The formula is kg = lb × 0.45359237. It is exact because the international pound is defined as exactly 0.45359237 kilograms.

The reverse formula is lb = kg ÷ 0.45359237 — or use the KG to LBS converter. Three worked examples:

• A body weight of 150 lb: 150 lb × 0.45359237 = 68.0389 kg
• A 45 lb barbell plate: 45 lb × 0.45359237 = 20.4117 kg
• A newborn weighing 7.5 lb: 7.5 lb × 0.45359237 = 3.4019 kg

LBS to KG quick reference

The values people look up most often, worked out with the exact factor:

• 1 lb = 0.453592 kg
• 1 kg = 2.20462 lb
• 5 lb = 2.268 kg
• 10 lb = 4.5359 kg
• 50 lb = 22.6796 kg
• 100 lb = 45.3592 kg

Quick tip: Halve the pounds and take away 10% of that: 200 lb → 100 − 10 = 90 kg, close to the exact 90.7185 kg.

Related conversions: Pounds to Grams, Stone to KG and the full weight converter.

LBS to KG conversion table

Values in kilograms are rounded to 4 decimal places (more for very small numbers). For any value not listed, type it into the converter above.