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MPH to KM/H Converter

Convert miles per hour to kilometers per hour instantly, with a reference table of common speed limits.

MPH to KM/H Converter

1 mph = 1.609 km/h

Multiply miles per hour by 1.609344 to get kilometers per hour.

The link carries the values you entered, so whoever opens it sees the same result. Nothing is stored on our side — the numbers travel in the link itself.

Miles per hour to kilometers per hour reference table

The conversions people look up most often, rounded to 3 decimal places.

Common miles per hour to kilometers per hour conversions
Mile per hour (mph)Kilometer per hour (km/h)
5 mph8.047 km/h
10 mph16.093 km/h
20 mph32.187 km/h
25 mph40.234 km/h
30 mph48.28 km/h
35 mph56.327 km/h
40 mph64.374 km/h
50 mph80.467 km/h
55 mph88.514 km/h
60 mph96.561 km/h
65 mph104.607 km/h
70 mph112.654 km/h
80 mph128.748 km/h

The miles per hour people look up most

20 mph = 32.187 km/h
The limit on an increasing number of British residential streets and city centres.
30 mph = 48.28 km/h
The UK urban limit, just under the European 50 km/h and never quite the same thing.
35 mph = 56.327 km/h
A typical US residential limit, well above the European 50 km/h equivalent.
40 mph = 64.374 km/h
A UK limit on faster urban roads and many dual carriageways.
55 mph = 88.514 km/h
The old US national maximum, kept on many secondary roads long after the federal rule went.
60 mph = 96.561 km/h
Close enough to the 100 km/h rural limit used across most of Europe that the two feel identical to drive.
65 mph = 104.607 km/h
A common US interstate limit, close to the European 100 km/h rural standard.
70 mph = 112.654 km/h
The UK motorway limit, which sits between the European 110 and 120 km/h.
80 mph = 128.748 km/h
Above every national motorway limit in Europe except the derestricted stretches of German autobahn.

How the mph to km/h calculation works

Speed converts on the same factor as distance, because the "per hour" is identical on both sides:

km/h = mph × 1.609344

A worked example for anyone driving abroad: a 70 mph motorway limit is 70 × 1.609344 = 112.7 km/h, which is why UK and US highway speeds map so closely onto the 110-120 km/h limits used across continental Europe. A 30 mph urban limit is 48.3 km/h, essentially the 50 km/h standard used almost everywhere in the metric world.

The conversions that matter most when renting a car:

  • 25 mph ≈ 40 km/h — residential streets
  • 55 mph ≈ 89 km/h — US secondary highways
  • 65 mph ≈ 105 km/h — US interstates
  • 80 mph ≈ 129 km/h — the upper end of European motorway limits

Two practical tips:

  • Multiply by 1.6 in your head. 60 mph → 96 km/h against a true 96.6. That is accurate enough to keep you legal.
  • Read the speedometer, not the conversion. Nearly every car sold in the last two decades prints both scales on the dial, and rental cars in metric countries show km/h as the primary. Convert to sanity-check a road sign, not to drive by.

To convert km/h back to mph, divide by 1.609344 — or multiply by 0.621371.

Frequently asked questions

Does a car speedometer read high on purpose?

By design and by regulation. European and UK rules require that a speedometer never indicates below the true speed, and permit it to read up to 10% plus 4 km/h above. Manufacturers use much of that margin, so a dial showing 70 mph commonly means two or three mph less over the ground. A GPS reading is closer to the truth, which is why a satnav and the dial rarely agree.

Are foreign speed cameras triggered on the metric figure?

Yes, and any tolerance is applied in the local unit too. A French or Spanish camera works to a km/h threshold, so converting your indicated mph to judge how close you are stacks your speedometer’s optimism on top of the conversion - the wrong margin to be working with. If the car has a metric display mode, switch to it and read the number the enforcement uses.

Is 0-60 mph the same test as 0-100 km/h?

Nearly, which is why the figures look interchangeable. 60 mph is 96.6 km/h, so a 0-100 km/h run covers a little more speed than a 0-60 mph one and is typically a couple of tenths slower for the same car. Magazines in each market quote their own, so a car listed at 5.0 seconds in America may appear as 5.2 in Europe with nothing having changed.

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