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Weight / Mass Converter

Convert mass in both directions with clearly named units.

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How Weight / Mass Converter works

Avoirdupois pound = 0.45359237 kg. These units measure mass, not force.

Try an example

1 kg ≈ 2.204622621849 lb.

Good to know

Values use double-precision arithmetic and are rounded to 13 significant digits. Named definitions matter; choose the intended unit.

Your privacy

Processing happens on this device for this tool. We do not upload your input, put it in share links or save it to your favourites. Closing this tab discards the working input; downloaded results remain wherever you save them.

When this tool is useful

Use the mass converter for everyday weight checks such as kilograms to pounds, grams to ounces or tonnes to kilograms.

How to use it

  1. Enter the known mass and choose its unit.
  2. Select the target unit; both directions update immediately.
  3. Copy the number with the unit label so the conversion cannot be separated from its meaning.

Checks before you rely on the result

  • Mass and force are different quantities; this tool does not convert kilograms into newtons.
  • The result uses named conversion factors and display rounding.
  • A scale reading may be affected by calibration and local conditions that a unit converter cannot know.

This page is maintained with the tool implementation and its deterministic tests. If the result looks wrong, report the issue with a non-sensitive example.

Read the Weight / Mass Converter instructions

A useful next step

Length Converter
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