Chemical, refrigeration, mechanical and export work constantly calls for fast conversion between metric, imperial, US customary and Chinese customary units. This Unit Converter runs directly on the page - no installation required:
Features
- 13 categories, 164 units: length, area, volume/capacity, mass, temperature, pressure, power, energy, time, speed, illuminance, force and gas concentration.
- Two-way conversion: edit either input box and the other side updates instantly - no button to press.
- Dedicated gas-concentration conversion: ppm, ppb and % (by volume) against mg/m³ and µg/m³, calculated at 25 °C and 101.3 kPa using the molar mass M (g/mol) you enter.
- Ambiguous units annotated inline: imperial vs US gallon, long vs short ton, stone and dram, and the Chinese customary dan/jin/liang/qian are all explained in the interface.
- Multiple temperature scales: Celsius, Fahrenheit, Kelvin, Rankine and Réaumur, bridged through Celsius.
Typical uses
Checking refrigeration and HVAC equipment parameters, costing chemical dosing and export quotations, converting units on import/export documents, and engineering teaching demonstrations. Conversion factors follow common SI definitions and are provided for demonstration and teaching reference only - not for safety-critical or trade-settlement purposes. Where imperial or US customary units are ambiguous, the contractually agreed definition prevails.
