Miles to Kilometers Converter
Convert miles to kilometers instantly. Exact factor: 1 mi = 1.609 km.
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Convert miles to kilometers
The exact conversion factor is 1 mi = 1.609 km. Type any value and the result updates instantly; the math is shown beneath the board.
Worked by hand
Multiply the miles value by 1.609 to get kilometers.
Worked example
- Take 1 mi
- multiply by 1.609
- the result is 1.609 km
How to use it
- Enter your miles
- Read the kilometers result
- Check the factor line to verify by hand
Frequently asked questions
How many kilometers are in one miles?
Exactly 1.609 km, by the SI/NIST definition.
How do I convert kilometers back to miles?
Divide by 1.609 — 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.