Kilometers Per Hour to Miles Per Hour
1 kilometer / hour = 0.621371 miles per hour (mph)
Convert kilometers per hour to miles per hour instantly. 1 kilometer / hour = 0.621371 miles per hour. Free, accurate, with conversion table and formula.
Kilometer / Hour (km/h)
Mile / Hour (mph)
| Unit | 1 km/h equals |
|---|---|
| Meter / Second (m/s) | 0.277778 |
| Kilometer / Hour (km/h) | 1 |
| Mile / Hour (mph) | 0.621371 |
| Foot / Second (ft/s) | 0.911344 |
| Knot (kn) | 0.539957 |
| Mach (Ma) | 0.000809848 |
How to convert kilometers per hour to miles per hour
- 1Take your value in kilometers per hour (km/h).
- 2Multiply by 0.621371.
- 3The result is your value in miles per hour (mph).
Kilometers Per Hour to Miles Per Hour conversion table
| Kilometers Per Hour (km/h) | Miles Per Hour (mph) |
|---|---|
| 1 | 0.621371 |
| 2 | 1.24274 |
| 5 | 3.10686 |
| 10 | 6.21371 |
| 25 | 15.5343 |
| 50 | 31.0686 |
| 100 | 62.1371 |
| 250 | 155.343 |
| 500 | 310.686 |
| 1,000 | 621.371 |
Frequently asked
How many miles per hour are in a kilometer / hour?
1 kilometer / hour equals 0.621371 miles per hour (mph).
How do I convert kilometers per hour to miles per hour?
Multiply the number of kilometers per hour by 0.621371 to get miles per hour.
What is 10 kilometers per hour in miles per hour?
10 km/h equals 6.214 mph.
What is 100 kilometers per hour in miles per hour?
100 km/h equals 62.14 mph.
How do I convert miles per hour back to kilometers per hour?
Multiply miles per hour by 1.60934 (the reciprocal) or use the swap button above.
Where you'll actually use this
Speed measures distance covered per unit of time. Common units include km/h, mph, m/s, knots, and the speed of light (c).
- Driving
Speed limits use km/h in most countries; mph in the US, UK, and a few others.
- Aviation & maritime
Planes and ships report speed in knots (nautical miles per hour) — 1 kn ≈ 1.852 km/h.
- Running & cycling
Pace apps switch between min/km and min/mi; speed in km/h vs mph depending on locale.
Common mistakes to avoid
- kph isn't a real unit
The correct abbreviation is km/h. 'kph' is informal and not used in technical writing.
- Knots already includes 'per hour'
Saying 'knots per hour' is redundant — it's just 'knots'.
Did you know?
Mach 1 isn't a fixed speed — it depends on temperature. At sea level it's roughly 1,225 km/h, falling to ~1,062 km/h at altitude.
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