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km/h to mph Converter

Convert kilometers per hour to miles per hour for speed limits, car specs, and weather reports. Type a speed in km/h and the km/h to mph converter gives the exact figure, with every other speed unit listed under it.

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Result
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How to use the km/h to mph Converter

  1. Type the speed in kilometers per hour into Value.
  2. The answer in miles per hour updates as you type. The swap button turns it into mph to km/h.
  3. The table under the result gives the same speed in m/s, knots, ft/s, and Mach.

How it works

mph = km/h ÷ 1.609344
mph ≈ km/h × 0.621371

A mile is exactly 1.609344 kilometers, so dividing by that number gives the exact answer. Multiplying by 0.621371 matches it to six decimal places.

Examples

  • 64 km/h = 39.77 mph.
  • 40 km/h = 24.85 mph.
  • 215 km/h = 133.59 mph.

km/h to mph table

km/hmph
5 km/h3.11 mph
15 km/h9.32 mph
25 km/h15.53 mph
40 km/h24.85 mph
64 km/h39.77 mph
65 km/h40.39 mph
70 km/h43.5 mph
75 km/h46.6 mph
140 km/h86.99 mph
160 km/h99.42 mph
200 km/h124.27 mph
215 km/h133.59 mph
250 km/h155.34 mph
300 km/h186.41 mph

Values rounded to two decimal places.

km/h, kph, and kmh

All three mean kilometers per hour. The SI symbol is km/h, and kph turns up in news and car reviews. Road signs in countries that use the metric system usually show the number with no unit at all, so a sign reading 50 means 50 km/h, which is 31.07 mph.

Limitations

  • Speeds can't be negative here. Keep the direction separately.
  • Mach uses the speed of sound at sea level and 15 °C, so it is only a guide at altitude.

Read the guide

Convert km/h to mph

Divide by 1.609344 for the exact answer, or multiply by 5 and divide by 8 when you need a quick figure at the wheel.

Frequently asked questions

How fast is 100 km/h in mph?

62.14 mph. Divide 100 by 1.609344.

Is 65 km/h the same as 40 mph?

Close to it. 65 km/h is 40.39 mph.

What is 40 km/h in miles per hour?

24.85 mph.

Often used together with km/h to mph Converter.