Unit Converter
Convert values across six measurement categories: length, mass, temperature, area, volume and speed. Common metric, imperial and US customary units are included so one page can handle travel, cooking, construction, fitness and technical comparisons.
Most conversions pass through a documented base unit using published factors. Temperature uses the Celsius, Fahrenheit and Kelvin equations because temperature scales require an offset as well as a multiplier. Results keep useful precision without changing the entered value.
How to use this calculator
- Choose a measurement category.
- Enter a value and select the source and target units.
- Calculate and review the converted value and equation.
Method and sources
- NIST: SI Units — SI unit definitions and guidance
- NIST Handbook 44, Appendix B — Measurement-system relationships
Frequently asked questions
Which measurement types are supported?
Length, mass, temperature, area, volume and speed are available, with metric plus commonly used imperial or US units.
Why is temperature calculated differently?
Temperature scales have different zero points, so conversion needs both a multiplier and an offset.
Are US and imperial volumes identical?
No. The labels in this calculator explicitly identify teaspoon, tablespoon, cup, pint and gallon values as US measures.