How do you convert kph to mph?

Multiply kilometers per hour (kph or km/h) by 0.621371 to get miles per hour (mph). Example: 100 km/h × 0.621371 = 62.1371 mph.

What factor does this calculator use?

This calculator uses the standard conversion 1 km/h = 0.621371 miles per hour, derived from 1 mile = 1.609344 kilometers.

Can I convert mph back to kph?

Yes. Divide mph by 0.621371 (or multiply by 1.60934) to get kph. The reverse input is included below.

KPH to MPH Converter

Convert kilometers per hour to miles per hour with the standard 0.621371 factor. Handy for cars imported from Europe, running/cycling data, or any metric-to-imperial speed conversion.

Convert speed

Speed in KPH km/h

Decimal places

Presets (km/h):

Result

Miles per hour: –

Factor used: 1 km/h = 0.621371 mph

Reverse (MPH → KPH)

KPH to MPH formula

The conversion is based on the relationship between kilometers and miles:

1 mile = 1.609344 kilometers

mph = kph × 0.621371

Example: 120 km/h × 0.621371 ≈ 74.6 mph.

Quick reference table

KPH	MPH
30	18.6
50	31.1
60	37.3
80	49.7
100	62.1
120	74.6

FAQ

Is kph the same as km/h?

Yes. kph, km/h and kmh are commonly used for kilometers per hour. This tool accepts any of those forms.

Why do I need this?

If you drive in the UK/US with a car imported from a km/h country, or if your fitness tracker is set to km/h but you think in mph, this makes the conversion instant.