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MPH to KM/H Converter

Convert miles per hour to kilometers per hour as you type, with the exact formula, a full chart and the speed limits you will meet in the US and UK.

mph
Switch to km/h to mph
Updated September 2026By 0-60calc TeamSources
0-60CALC.COMEstimated result slip
Conversion
InputWaiting for input
Kilometers per hour
---km/h

Press Calculate to print your slip

1 mile = 1.609344 km exactly. Always follow the posted speed limit.

Want the acceleration too? Open the 0-60 Calculator

On this page

How to convert mph to km/h

One mile is exactly 1.609344 kilometers, a definition fixed by international agreement in 1959. That makes the conversion exact in both directions.

Exact formula

km/h = mph × 1.609344

Mental shortcut

km/h ≈ mph × 1.6

1 mph
1.609344 km/h
1 km/h
0.621371 mph
Meters per second
km/h ÷ 3.6, or mph × 0.44704
Knots
km/h ÷ 1.852, or mph × 0.868976

Worked example: 70 mph × 1.609344 = 112.7 km/h. With the shortcut, 70 × 1.6 = 112 km/h, close enough for a road sign.

mph to km/h chart

Common speeds, from city streets to hypercar top speeds.

mph to km/h conversion chart
mphkm/hContext
5 mph8.0 km/hCycling or jogging speed
10 mph16.1 km/hCycling or jogging speed
15 mph24.1 km/hCycling or jogging speed
20 mph32.2 km/hA 30 km/h or 20 mph zone
25 mph40.2 km/hTypical urban limit
30 mph48.3 km/hTypical urban limit
35 mph56.3 km/hRural road speed
40 mph64.4 km/hRural road speed
45 mph72.4 km/hRural road speed
50 mph80.5 km/hRural road speed
55 mph88.5 km/hRural road speed
60 mph96.6 km/hHighway speed
65 mph104.6 km/hHighway speed
70 mph112.7 km/hHighway speed
75 mph120.7 km/hMotorway speed
80 mph128.7 km/hMotorway speed
85 mph136.8 km/hAbove almost every speed limit
90 mph144.8 km/hAbove almost every speed limit
100 mph160.9 km/hAbove almost every speed limit
110 mph177.0 km/hAbove almost every speed limit
120 mph193.1 km/hAbove almost every speed limit
130 mph209.2 km/hSports car and supercar territory
140 mph225.3 km/hSports car and supercar territory
150 mph241.4 km/hSports car and supercar territory
160 mph257.5 km/hSports car and supercar territory
180 mph289.7 km/hSports car and supercar territory
200 mph321.9 km/hHypercar top speeds
250 mph402.3 km/hHypercar top speeds

More mph to km/h conversions

Speeds that fall between the rows of the chart above, from fast motorway cruising to supercar top speeds.

Dual scale showing mph values below their km/h equivalents
Read across: every mph value (bottom) sits below its km/h equivalent (top).
More mph values converted to km/h
mphkm/h
95 mph152.9 km/h
105 mph169.0 km/h
115 mph185.1 km/h
125 mph201.2 km/h
135 mph217.3 km/h
145 mph233.4 km/h
155 mph249.4 km/h
170 mph273.6 km/h
190 mph305.8 km/h
220 mph354.1 km/h
300 mph482.8 km/h

155 mph is the 250 km/h limit that many German performance cars are electronically capped at. Going the other way? Use the km/h to mph converter.

Speed limits in mph and km/h

Renting a car in the US or UK, or reading an American review? These are the mph limits you will meet most often. Limits vary by country and road, so always follow the signs.

Common speed limits
LimitIn km/hWhere you'll see it
20 mph32.2 km/hUK residential zones
25 mph40.2 km/hResidential streets in much of the US
30 mph48.3 km/hUK built-up areas
55 mph88.5 km/hFormer US national limit, still common on rural roads
65 mph104.6 km/hCommon US interstate limit
70 mph112.7 km/hUK motorways and many US interstates
85 mph136.8 km/hHighest posted limit in the US, on a Texas toll road

Speeds in car specs

0-60 mph vs 0-100 km/h

100 km/h is 62.1 mph, so a 0-100 km/h time runs about 5% longer than the same car's 0-60 mph time. Our 0-60 calculator shows both.

Tire speed ratings

Ratings are set in km/h and converted: H is 210 km/h (130 mph), V 240 km/h (149 mph), Y 300 km/h (186 mph). See the tire speed rating chart.

Top speeds

European spec sheets quote top speed in km/h. 250 km/h (155 mph) is a common electronic limit on German performance cars.

kph, km/h and kmh

All three mean kilometers per hour. km/h is the official form; "km" alone is a distance, not a speed.

Sources and method

One international mile is exactly 1.609344 km, so 1 mph = 1.609344 km/h. Nothing on this page is estimated.

Updated September 2026. Built and checked by the 0-60calc Team. Found a mistake? Tell us and we will check it against the source.

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Questions people ask

How do I convert mph to km/h?

Multiply the speed in mph by 1.609344. For example, 60 mph × 1.609344 = 96.6 km/h. For a quick estimate in your head, multiply by 1.6.

Is 60 mph the same as 100 km/h?

Not quite. 60 mph is 96.6 km/h; 100 km/h is 62.1 mph. The two benchmarks are close enough that car makers quote one or the other depending on the market.

How fast is 70 mph in km/h?

70 mph is 112.7 km/h. It's the motorway limit in the UK and a common interstate limit in the US.

How fast is 100 mph in km/h?

100 mph is 160.9 km/h.

How many km/h is 200 mph?

200 mph is 321.9 km/h, beyond the 300 km/h limit of a Y-rated tire.

Is mph the same as miles per hour?

Yes. mph stands for miles per hour. One mile is exactly 1.609344 kilometers, so 1 mph is 1.609344 km/h.