Miles per hour to kilometers per hour converter

1 mph = 1.609344 km/h (exact). To convert miles per hour to kilometers per hour, divide by 0.621371192 (or multiply by ≈ 1.609344). Example: 10 mph = 16.09344 km/h.

Result (km/h)

km/h = mph ÷ 0.621371192 · Swap: Kilometers per hour to miles per hour

Open the full tool: Unit converter →

Miles per hour to kilometers per hour chart

Miles per hourKilometers per hour
10 mph16.0934 km/h
15 mph24.1402 km/h
20 mph32.1869 km/h
25 mph40.2336 km/h
30 mph48.2803 km/h
35 mph56.327 km/h
40 mph64.3738 km/h
45 mph72.4205 km/h
50 mph80.4672 km/h
55 mph88.5139 km/h
60 mph96.5606 km/h
65 mph104.607 km/h
70 mph112.654 km/h
75 mph120.701 km/h
80 mph128.748 km/h
100 mph160.934 km/h
150 mph241.402 km/h
200 mph321.869 km/h

How to convert miles per hour to kilometers per hour

Formula: km/h = mph ÷ 0.621371192. Worked example: 10 mph = 16.09344 km/h. Quick estimate: multiply by about 1.6 — the error is 0.58%, fine for everyday use but not for engineering or shopping by exact size.

About these units

One mile per hour is exactly 1.609344 km/h. Speed limits in the US and UK are posted in mph: 30 mph ≈ 48 km/h in town, 70 mph ≈ 113 km/h on UK motorways, while most of the world signs limits in km/h.

Category: speed. Results on this page are calculated in your browser and rounded to 7 significant digits; the table above uses 6. For other units of speed open the full unit converter, or use the reverse page — kilometers per hour to miles per hour.

FAQ

How many kilometers per hour are in one mph?

1 mph = 1.609344 km/h exactly. Conversely, 1 km/h = 0.6213712 mph.

What is 100 mph in kilometers per hour?

100 mph = 160.9344 km/h.

Is this converter accurate?

Yes — it uses the official definitions (1 mph = 1.609344 km/h, 1 km/h = 1 km/h) and shows results rounded to 7 significant digits.

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