About EngiConvert

Free unit conversion, built around engineering accuracy.

Why this site exists

Most online unit converters are built for the general public: miles to kilometres, pounds to kilograms, the kind of thing you look up once and forget. That coverage is useful, but it leaves out the units engineers actually reach for day to day — ksi and MPa for material strength, N·m and lbf·ft for torque specs, lb/ft³ and kg/m³ for density, mm⁴ and in⁴ for section properties. EngiConvert was built to cover both in one place: the everyday conversions people search for constantly, and the engineering-specific ones that general-purpose converters either omit or bury several menus deep.

How accuracy is handled

Every conversion factor on this site is a standard, published value rather than an approximation — for example, the inch is defined as exactly 25.4 millimetres, and the pound as exactly 0.45359237 kilograms, per international agreement. Where a conversion is affine rather than a simple ratio (temperature is the obvious case — Celsius and Fahrenheit don't share a zero point), the tool uses the correct formula rather than a linear shortcut. Before anything is published, the full set of conversion factors is checked against independently known reference values — for instance, confirming that 1 ksi converts to 6.894757 MPa, or that 36 ksi (mild steel yield strength) comes out to roughly 248 MPa, matching published engineering references.

17 conversion categories From everyday length and mass to pressure, torque, density and area moment of inertia.

Runs in your browser No account, no server round-trip for your numbers, no data collected about what you convert.

Exact, published factors Every factor traces to an internationally defined standard, not a rounded approximation.

Who's behind it

EngiConvert is an independently run reference tool, not affiliated with any standards body, unit converter brand, or engineering consultancy. It's maintained as a focused, single-purpose utility rather than a large content site — the goal is to keep the converter itself fast and correct, and to keep adding the specific engineering categories that are missing from most general-purpose converters.

Get in touch

Found a conversion that looks wrong, a unit you'd like added, or just want to say hello? Email admin@engunitconverter.com. Reports of incorrect conversion factors get priority — accuracy is the entire point of the site.

You can also read the Privacy Policy and Terms of Use for details on data handling and acceptable use.