Convert pounds to kilograms

1 lb=0.4536kg

Use the converter below to change any pounds value into kilograms instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.45359

Conversion formula

Forward

kilograms = pounds × 0.4536

Reverse

pounds = kilograms × 2.20462

Example: 10 lb × 0.4536 = 4.53592 kg.

About both units

From

Pound

The pound equals 453.59237 grams exactly since 1959. It is the standard weight unit in the United States and widely used in the UK alongside kilograms. Adult body weight in the US is quoted in pounds (130–200 lb typical range). Boxing heavyweight division is above 200 lb.

Real-world: An average adult is 130–200 lb. US airline luggage allowance is usually 50 lb (22.7 kg). A gallon of milk weighs about 8.6 lb.

Read full pound reference →

Kilogram

The kilogram is the SI base unit of mass. Since 2019 it has been defined via the fixed numerical value of Planck's constant — a major shift from the previous definition based on a physical artifact. One litre of water at 4 °C has a mass of almost exactly 1 kg, a coincidence designed into the original 1795 definition.

Real-world: A litre of water weighs 1 kg at 4 °C. An average adult weighs 60–90 kg. A standard bag of flour is 1 kg.

Read full kilogram reference →

Pound to Kilogram conversion table

Common pounds to kilograms values for quick reference.

Pound (lb)	Kilogram (kg)
1 lb	0.4536 kg
5 lb	2.26796 kg
10 lb	4.53592 kg
25 lb	11.3398 kg
50 lb	22.6796 kg
100 lb	45.3592 kg
250 lb	113.398 kg
500 lb	226.796 kg
1,000 lb	453.592 kg
5,000 lb	2,267.96 kg

Tips & common mistakes

Quick tips

1 lb ≈ 453.6 g ≈ ½ kg. For mental conversion: kg = lb / 2.2.
1 lb = 16 oz exactly. American recipes often mix pounds and ounces.
UK shop labels often show kg and lb together; US labels are pounds only.

Avoid these

Using 2 instead of 2.205 when converting lb to kg — a 10% error on airline luggage.
Confusing mass pounds (lb) with pound-force (lbf) in engineering.
Assuming a British and American pound are different — they are identical (0.45359237 kg).

Frequently asked questions

How many kilograms in a pound?

One pound equals 0.4536 kilograms.

How do I convert pounds to kilograms?

Multiply the pound value by 0.4536 to get the equivalent in kilograms.

What is 100 pounds in kilograms?

100 pounds equals 45.3592 kilograms.

Is a pound bigger than a kilogram?

No. 1 pound equals 0.4536 kilograms, so one pound is smaller.

How to convert pounds to kilograms without a calculator?

Multiply by 0.45 for a quick estimate; use a calculator for precise results.

Related weight conversions

📊 See full comparison matrix →

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