MPH to KM/H Calculator — Convert Miles per Hour to Kilometres per Hour

Use this free mph to km/h calculator to instantly convert miles per hour to kilometres per hour. Results also show metres per second and knots. Perfect for understanding overseas speed limits and vehicle specifications.

Convert miles per hour to kilometres per hour instantly

Miles per Hour (mph)

mph

Please enter a valid speed in mph.

🚗 Kilometres per Hour

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⚡ Metres per Second

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⚓ Knots

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🏃 Feet per Second

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⚡ Quick Reference — click to convert

How to Convert MPH to KM/H

To convert miles per hour to kilometres per hour, multiply the speed by 1.60934. This works because one mile equals 1.60934 kilometres — so multiplying converts the distance unit from miles to kilometres.

Formula

KM/H = MPH × 1.60934

Example: 60 mph × 1.60934 = 96.56 km/h

For a quick rough estimate, multiply mph by 1.6 — accurate enough for everyday use. To convert back from km/h to mph, divide by 1.60934.

Common MPH to KM/H Conversions

Here are the most frequently needed speed conversions — particularly useful for UK drivers travelling in Europe:

Miles per Hour (mph)	Kilometres per Hour (km/h)	Context
20 mph	32.2 km/h	Urban speed limit (UK)
30 mph	48.3 km/h	Standard UK town limit
40 mph	64.4 km/h	UK A-road limit
50 mph	80.5 km/h	UK dual carriageway
60 mph	96.6 km/h	UK single carriageway
70 mph	112.7 km/h	UK motorway limit
80 mph	128.7 km/h	US highway speeds
100 mph	160.9 km/h	High performance driving

When Would You Need to Convert MPH to KM/H?

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Driving in Europe

UK drivers travelling abroad need to understand speed limits shown in km/h.

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Imported Vehicles

Cars imported from Europe show km/h — convert to understand UK speed limits.

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Running & Fitness

Running apps may use mph while treadmills show km/h — convert between them easily.

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Science & Education

Physics problems often require converting between imperial and metric speed units.

UK Speed Limits in KM/H

UK speed limits are shown in mph on road signs. Here's what they equal in km/h — useful for drivers from Europe visiting the UK:

20 mph — 32 km/h — residential zones and school areas
30 mph — 48 km/h — standard built-up area limit
60 mph — 97 km/h — single carriageway roads
70 mph — 113 km/h — motorways and dual carriageways

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FAQs

How do I convert mph to km/h?

Multiply the speed in mph by 1.60934. For example, 60 mph × 1.60934 = 96.56 km/h.

What is 70 mph in km/h?

70 mph is equal to 112.65 km/h — the UK motorway speed limit converted to kilometres.

What is 60 mph in km/h?

60 mph is equal to 96.56 km/h — roughly 100 km/h.

What is 30 mph in km/h?

30 mph is equal to 48.28 km/h — the standard UK town speed limit.

Which countries use mph?

The United Kingdom, United States, Liberia and Myanmar use miles per hour. Most other countries use kilometres per hour.

Is this calculator free?

Yes — completely free, no sign-up required. Use it as many times as you need on any device.