Millimeter Calculator
Also known as mm Calculator. These names use this same conversion workflow.
Compare a measurement in the units used by your drawing, tape measure or supplier. Choose a direction and enter the measured length; the result changes units, not the physical length. International customary measures are used; survey and mixed feet/inches measurements need a different workflow.
Scope and assumptions
SI metric units and international inch=0.0254m, foot=0.3048m, yard=0.9144m, mile=1609.344m. Scalar lengths only: no survey-foot, nautical-mile, mixed feet/inches, astronomical distance or geometric measurement claim.
Only the directions listed below are supported. Switching units retains your entered amount and validates it against the new direction.
Centimeters = Millimeters × 0.1.
Open selected native calculatorKeep and compare a scenario
Scenarios stay in this browser. Share and embed links contain the selected amount; review it before sending.
Worked example
For example, 1 mm is 0.1 cm. Choose the units your own measurement uses.
Available directions
- mm → cm
- mm → dm
- mm → m
- mm → km
- mm → in
- mm → ft
- mm → yd
- mm → mi
- cm → mm
- dm → mm
- m → mm
- km → mm
- in → mm
- ft → mm
- yd → mm
- mi → mm