Free · Mass conversions

Pounds to Kilograms Conversion Calculator

Convert pounds to kilograms with editable results, unit choices and a worked example.

  • Formula & worked example
  • Private in your browser
  • No signup
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

1 lb = 0.45359237 kg. The international avoirdupois pound is exactly 0.45359237 kilograms. The conversion expresses mass, not force. Enter one known measurement to calculate its equivalent; editing the result allows conversion in the other direction.

1 lb = 0.45359237 kg

Worked example

Enter these known values and leave the other values blank.

Weight in lbs
1 lb
Weight in kg
0.4536 kg

Assumptions and limitations

  • The international avoirdupois pound is exactly 0.45359237 kilograms. The conversion expresses mass, not force.
  • The worked example uses the default units shown. Changing a unit selector preserves the same quantity; inspect the selected unit before entering a new value.

Common questions

What should I check when converting mass?

The international avoirdupois pound is exactly 0.45359237 kilograms. The conversion expresses mass, not force.

Will rounding change the measurement?

The unit conversion preserves the underlying quantity. Display rounding can hide smaller digits, so retain suitable precision for the original measurement and its intended use.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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