Kilometers/hour to Miles/hour Converter
Convert kilometers/hour to miles/hour instantly. Exact factor: 1 km/h = 0.62137 mph.
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Convert kilometers/hour to miles/hour
The exact conversion factor is 1 km/h = 0.62137 mph. Type any value and the result updates instantly; the math is shown beneath the board.
Worked by hand
Multiply the kilometers/hour value by 1.609 (that is, 1 ÷ 0.62137) to get miles/hour.
Worked example
- Take 1 km/h
- multiply by 1.609
- the result is 0.62137 mph
How to use it
- Enter your kilometers/hour
- Read the miles/hour result
- Check the factor line to verify by hand
Frequently asked questions
How many miles/hour are in one kilometers/hour?
Exactly 0.62137 mph, by the SI/NIST definition.
How do I convert miles/hour back to kilometers/hour?
Divide by 0.62137 — or use the full converter where both directions are one click.
Is this rounding or exact?
The factor is exact; only the displayed decimals are rounded.