mph to km/h converter
1 mph = 1.609344 km/h
To convert miles per hour to kilometers per hour, multiply by 1.609344. Type any speed below — the result updates as you type, and the swap button converts the other way.
Formula: km/h = mph × 1.609344
mph to km/h formula
km/h = mph × 1.609344
A mile is defined as exactly 1,609.344 meters, so 1 mph = 1.609344 km/h. Because the factor is exact, the conversion has no rounding error beyond the digits you keep.
Examples:
Quick mental math
- Multiply by 1.6 — 70 mph × 1.6 = 112 km/h (exact: 112.65).
- Add 60% — 50 mph + 30 = 80 km/h (exact: 80.47).
- Multiply by 8, divide by 5 — 30 mph × 8 ÷ 5 = 48 km/h (exact: 48.28).
mph to km/h conversion chart
Values rounded to two decimals. Click a highlighted speed for its detailed page.
| mph | km/h |
|---|---|
| 5 mph | 8.05 km/h |
| 10 mph | 16.09 km/h |
| 15 mph | 24.14 km/h |
| 20 mph | 32.19 km/h |
| 25 mph | 40.23 km/h |
| 30 mph | 48.28 km/h |
| 35 mph | 56.33 km/h |
| 40 mph | 64.37 km/h |
| 45 mph | 72.42 km/h |
| 50 mph | 80.47 km/h |
| 55 mph | 88.51 km/h |
| 60 mph | 96.56 km/h |
| 65 mph | 104.61 km/h |
| 70 mph | 112.65 km/h |
| 75 mph | 120.7 km/h |
| 80 mph | 128.75 km/h |
| 85 mph | 136.79 km/h |
| 90 mph | 144.84 km/h |
| 95 mph | 152.89 km/h |
| 100 mph | 160.93 km/h |
| mph | km/h |
|---|---|
| 105 mph | 168.98 km/h |
| 110 mph | 177.03 km/h |
| 115 mph | 185.07 km/h |
| 120 mph | 193.12 km/h |
| 125 mph | 201.17 km/h |
| 130 mph | 209.21 km/h |
| 135 mph | 217.26 km/h |
| 140 mph | 225.31 km/h |
| 145 mph | 233.35 km/h |
| 150 mph | 241.4 km/h |
| 155 mph | 249.45 km/h |
| 160 mph | 257.5 km/h |
| 165 mph | 265.54 km/h |
| 170 mph | 273.59 km/h |
| 175 mph | 281.64 km/h |
| 180 mph | 289.68 km/h |
| 185 mph | 297.73 km/h |
| 190 mph | 305.78 km/h |
| 195 mph | 313.82 km/h |
| 200 mph | 321.87 km/h |
Common speed limits in mph and km/h
| mph | km/h | Where you'll see it |
|---|---|---|
| 20 mph | 32 km/h | School zones and 20 mph zones in the UK and US |
| 25 mph | 40 km/h | Typical US residential streets |
| 30 mph | 48 km/h | Built-up areas in the UK |
| 55 mph | 89 km/h | Many US two-lane highways |
| 60 mph | 97 km/h | UK single carriageways (cars) |
| 65 mph | 105 km/h | Many US interstates and freeways |
| 70 mph | 113 km/h | UK motorways and dual carriageways; many US interstates |
| 75 mph | 121 km/h | Interstates in many western US states |
| 85 mph | 137 km/h | Texas State Highway 130 — the highest posted limit in the US |
Speed limits change and vary by vehicle type and local signs. Always follow the posted limit. Want to check your actual speed? Use the GPS speedometer.
km/h, kph or kmph?
They're the same unit. km/h is the official SI symbol, kph is common in American and British English, and kmph is often used in India. So “mph to kmh”, “mph to kph” and “mph to kmph” are all the same conversion. Miles per hour is written mph (sometimes “mi/h”).
Converting the other way? Use the km/h to mph converter. For knots, m/s and other units, open the speed converter.
Popular mph to km/h conversions
- 10 mph to km/h
- 20 mph to km/h
- 25 mph to km/h
- 30 mph to km/h
- 35 mph to km/h
- 40 mph to km/h
- 45 mph to km/h
- 50 mph to km/h
- 55 mph to km/h
- 60 mph to km/h
- 65 mph to km/h
- 70 mph to km/h
- 75 mph to km/h
- 80 mph to km/h
- 90 mph to km/h
- 100 mph to km/h
- 110 mph to km/h
- 120 mph to km/h
- 130 mph to km/h
- 133 mph to km/h
- 140 mph to km/h
- 150 mph to km/h
- 160 mph to km/h
- 180 mph to km/h
- 200 mph to km/h
- 250 mph to km/h
Frequently asked questions
How do I convert mph to km/h?
Multiply the speed in mph by 1.609344. For example, 60 mph × 1.609344 = 96.56 km/h. The factor is exact, because one mile is defined as 1,609.344 meters.
What is 60 mph in km/h?
60 mph is 96.56 km/h. See the full breakdown on the 60 mph to km/h page.
Is mph to kph the same as mph to km/h?
Yes. kph, km/h and kmph are all names for kilometers per hour. Converting mph to kph, mph to km/h or mph to kmph gives the same result.
How can I convert mph to km/h in my head?
Multiply by 1.6 — or add 60%. 50 mph × 1.6 = 80 km/h; the exact answer is 80.47 km/h. For speeds like 30, 50 and 70 mph, the result is accurate to within 1 km/h.
Which countries use mph?
The United States and the United Kingdom are the main countries that post road speed limits in miles per hour. Almost every other country uses km/h.
What is 70 mph in km/h?
70 mph is 112.65 km/h — the speed limit on UK motorways. Details on the 70 mph to km/h page.
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