Weight Converter
Enter a value and a source unit to see conversions.
1 lb = 0.4536 kg.
How the Weight Converter works
The Weight Converter converts values between the standard units used for weight converter. Enter a value in any supported unit and every other unit updates instantly, so you can copy the one you need without doing another conversion.
Conversion factors are the exact ratios defined by the international system of units (SI) — no rounding shortcuts, no lossy intermediate steps.
- Exact SI-defined conversion factors
- Live two-way conversion — change any field, everything updates
- Handles very large and very small values
- Copy-friendly output for spreadsheets and reports
Choosing the right unit
Match the unit to your audience: SI for scientific work, imperial for US domestic contexts. When in doubt, present both — the Weight Converter makes that trivial.
Extremely small or large values are easier to read in scientific notation. The Weight Converter switches to scientific format automatically when a plain decimal would be hard to read.