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Kilometers per Hour to Miles per Hour

Type a value in Kilometers per Hour or Miles per Hour; the other field updates as you type.

Runs in your browser No sign-up

Swap units

50 km/h = 31.06856 mph

Decimals

Common values

Kilometers per Hour (km/h)Miles per Hour (mph)
10 km/h6.213712 mph
20 km/h12.427424 mph
30 km/h18.641136 mph
40 km/h24.854848 mph
50 km/h31.06856 mph
75 km/h46.602839 mph
100 km/h62.137119 mph
120 km/h74.564543 mph
200 km/h124.274238 mph
300 km/h186.411358 mph
400 km/h248.548477 mph
500 km/h310.685596 mph
750 km/h466.028394 mph
1,000 km/h621.371192 mph

How to use it

  1. Type the number of Kilometers per Hour in the first field.
  2. Read the result in Miles per Hour. You can also type in the Miles per Hour field to convert the other way.
  3. Use the table of common values, or copy the result with one click.

How it works

Formula: mph = km/h × 0.62137119

1 km/h = 0.621371 mph, and 1 mph = 1.609344 km/h.

Results use the exact definitions of both units. The page shows up to 6 decimal places; copy the value for full precision.

Examples

30 km/h in mph

30 km/h = 18.641136 mph, using mph = km/h × 0.62137119.

50 km/h in mph

50 km/h = 31.06856 mph, using mph = km/h × 0.62137119.

100 km/h in mph

100 km/h = 62.137119 mph, using mph = km/h × 0.62137119.

Frequently asked questions

How do I convert Kilometers per Hour to Miles per Hour?

Use the formula mph = km/h × 0.62137119. For example, 30 km/h = 18.641136 mph.

How do I convert Miles per Hour back to Kilometers per Hour?

Use the reverse formula km/h = mph × 1.609344. For example, 1 mph = 1.609344 km/h.

How accurate is this converter?

It uses the exact legal definitions of the units, so the only rounding is in the number of decimals shown. Copy the result to get the full value.

Privacy

The conversion runs entirely in your browser. Nothing you type is sent anywhere.