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Measure / translate / understand

Different units.
The same quantity.

A small, practical desk reference for moving between measurement systems. Choose your units. Keep your bearings.

01 / Unit converter

In your browser

Quantity

Value to convert

From

To

Converted value

—in

Your result will appear here.

Up to 12 significant digits. Display precision is not measurement accuracy. Read the notes.

Feet and miles use the international foot. Historical survey units are not included.

Keep the definitions close.

Open reference ↗

Length

From millimetres on a drawing to miles on a route.

Mass

Metric quantities, pounds and avoirdupois ounces.

Pressure

Pascal multiples, bar, psi and standard atmosphere.

Temperature

Three scales. Two offsets. One physical quantity.

Good numbers start
with clear assumptions.

An inch has an exact definition. A measured piece of timber does not have infinite precision. Caliper keeps those ideas separate: the calculation is transparent, and the accuracy still belongs to your measurement. How the calculator works.