Pounds to Kilograms Converter

One Pound equals 0.45359237 Kilograms (1 lb = 0.45359237 kg). Multiply a Pound value by 0.45359237 to get the equivalent in Kilograms. Enter a value above to calculate the result. You can also use the formula and reference table below.

Formula

kg = lb × 0.45359237

Multiply the Pound value by 0.45359237 to get the equivalent value in Kilograms.

Example Conversions

1 Pound (lb)

0.45359237 Kilogram (kg)

5 Pound (lb)

2.26796185 Kilogram (kg)

10 Pound (lb)

4.5359237 Kilogram (kg)

25 Pound (lb)

11.33980925 Kilogram (kg)

100 Pound (lb)

45.359237 Kilogram (kg)

Conversion Table

Common conversion values from Pound to Kilogram
Pound (lb)Kilogram (kg)
0.10.045359237
0.50.226796185
10.45359237
20.90718474
52.26796185
104.5359237
2511.33980925
5022.6796185
10045.359237
250113.3980925
500226.796185
1000453.59237

How to Convert Manually

Use these steps to convert Pound values to Kilogram without the calculator.

  1. Write down the value in Pound (lb) that you want to convert.
  2. Multiply that value by 0.45359237.
  3. For example, 10 Pounds × 0.45359237 = 4.5359237 Kilograms.
  4. Label the result as Kilogram (kg).

Relative Size Comparison

1 Pound
1 lb
1 Kilogram2.204622622 Pounds
1 kg

This chart shows the visual difference in size between exactly one Pound and one Kilogram.

About Pound and Kilogram

The pound (avoirdupois) is defined as exactly 0.45359237 kilograms under the 1959 international agreement. Body weight, groceries, and shipping in the US run on pounds. The kilogram is the SI base unit of mass, defined since 2019 by fixing the Planck constant rather than by the old platinum-iridium prototype. It is the reference for every other mass unit on this site. One Pound equals 0.45359237 Kilograms (1 lb = 0.45359237 kg). Pound is used in body weight in the US and in US grocery and butcher pricing. Kilogram is used in body weight outside the US.

Precision and Rounding:Metric-imperial mass factors are exact (1 lb = 0.45359237 kg by the 1959 agreement), so precision is purely a display choice. One decimal place is enough for body weight and cooking; nutrition labeling, pharmacy, and lab work need the full factor before rounding.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15Pounds equals6.80388555Kilograms.

15 lb × 0.45359237 = 6.80388555 kg

FAQ

How do I convert Pound to Kilogram?

Multiply the Pound value by 0.45359237 to get the equivalent value in Kilograms.

What is the formula for Pound to Kilogram?

The formula is kg = lb × 0.45359237.

How many Kilograms are in 1 Pound?

1 Pound equals 0.45359237 Kilograms.

Can I convert Kilogram back to Pound?

Yes. 1 Kilogram equals 2.204622622 Pounds, and the related converter can reverse the calculation.

What are common names for Pound and Kilogram?

Pound is shown as lb and may also be searched as pounds, lbs. Kilogram is shown as kg and may also be searched as kilograms, kilo, kilos.

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