Length / Weight / Volume Unit Converter

What is the Unit Converter?

This tool converts between common metric and imperial units across three categories: length (millimeters through miles), weight (milligrams through pounds), and volume (milliliters through gallons).

How to use it

1. Pick a category: Length, Weight or Volume.
2. Enter a value, then choose the "From" and "To" units.
3. The converted result updates instantly.

All conversions are calculated using standard, fixed conversion factors (for example, exactly 2.54 centimeters per inch, and exactly 0.45359237 kilograms per pound — both internationally agreed exact definitions, not rounded approximations), so results are precise regardless of which two units you choose. This is useful for reading a recipe written in a different measurement system, converting a shipping weight, following an international spec sheet, or just getting a feel for how one unit relates to another.