Engineering

Unit & Metric/Imperial Converter

Convert length, cutting speed, feed, mass, force, pressure, temperature and roughness units between metric and imperial, on exact definitions rather than rounded tables.

What you have

QuantityValueFromTo

Result

25.400 mm

1.000 in in millimetre (mm)

The same value, every unit

millimetre (mm)25.400

centimetre (cm)2.540

metre (m)0.0254

micrometre (µm)25400.0

thou / mil1000.0

foot (ft)0.0833

Before you use the number

Factors are the exact imperial-metric definitions (1 in = 25.4 mm, 1 lb = 0.45359237 kg), so the arithmetic cannot drift. Roughness units convert; roughness PARAMETERS do not - Ra, Rz and Rq are measured differently and the ratio between them depends on the process that made the surface.

Factors are the exact imperial-metric definitions (1 in = 25.4 mm, 1 lb = 0.45359237 kg), so the arithmetic cannot drift. Roughness units convert; roughness PARAMETERS do not - Ra, Rz and Rq are measured differently and the ratio between them depends on the process that made the surface.

What you provide

Quantity type
Value
Source unit
Target unit