Kilometer Calculator
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.
Millimeters = Kilometers × 1000000.
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 km is 1000000 mm. Choose the units your own measurement uses.
Available directions
- mm → km
- cm → km
- dm → km
- m → km
- km → mm
- km → cm
- km → dm
- km → m
- km → in
- km → ft
- km → yd
- km → mi
- in → km
- ft → km
- yd → km
- mi → km