About

Eng Units is a plain, fast set of unit converters for engineers, technicians and students: pressure, torque, force, power, energy, flow, length, area, volume, mass, velocity, temperature, density and viscosity.

Every page shows the formula, a worked example and a table of common values, so you can check the arithmetic yourself. Conversion factors follow SI definitions and NIST Special Publication 811. Where a unit has several definitions (horsepower, gallons, the inch of water), the page says which one is used.

Eng Units is published by Tidy Lookup, a small independent publisher of single-purpose reference sites. We aren't affiliated with any store, bank or agency named on this site. All trademarks belong to their owners.

Found a mistake? Email hello@tidylookup.com and we'll fix it, usually within a day.