How to convert miles per hour to kilometers per second
km/s = mph × 0.00044704Multiply the value in miles per hour by 0.00044704. To go the other way, multiply by 2,236.936292 (or divide by 0.00044704).
A mile per hour is smaller than a kilometer per second: it takes 2,236.936292 miles per hour to make one kilometer per second.
Worked examples
- 1 mile per hour1 mph × 0.00044704 = 0.00044704 km/s
- 5 miles per hour5 mph × 0.00044704 = 0.0022352 km/s
- 10 miles per hour10 mph × 0.00044704 = 0.0044704 km/s
- 20 miles per hour20 mph × 0.00044704 = 0.0089408 km/s
- 100 miles per hour100 mph × 0.00044704 = 0.044704 km/s
Miles per hour to kilometers per second conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Miles per hour (mph) | Kilometers per second (km/s) |
|---|---|
| 0.1 mph | 0.000044704 km/s |
| 0.25 mph | 0.00011176 km/s |
| 0.5 mph | 0.00022352 km/s |
| 1 mph | 0.00044704 km/s |
| 2 mph | 0.00089408 km/s |
| 3 mph | 0.00134112 km/s |
| 4 mph | 0.00178816 km/s |
| 5 mph | 0.0022352 km/s |
| 6 mph | 0.00268224 km/s |
| 7 mph | 0.00312928 km/s |
| 8 mph | 0.00357632 km/s |
| 9 mph | 0.00402336 km/s |
| 10 mph | 0.0044704 km/s |
| Miles per hour (mph) | Kilometers per second (km/s) |
|---|---|
| 12 mph | 0.00536448 km/s |
| 15 mph | 0.0067056 km/s |
| 20 mph | 0.0089408 km/s |
| 25 mph | 0.011176 km/s |
| 30 mph | 0.0134112 km/s |
| 40 mph | 0.0178816 km/s |
| 50 mph | 0.022352 km/s |
| 75 mph | 0.033528 km/s |
| 100 mph | 0.044704 km/s |
| 250 mph | 0.11176 km/s |
| 500 mph | 0.22352 km/s |
| 1,000 mph | 0.44704 km/s |
About the units
Mile per hour (mph)
Exactly 0.44704 m/s. Used for road speeds in the US and UK; 60 mph is about 96.6 km/h.
Kilometer per second (km/s)
The kilometer per second (km/s) is a unit of speed in the International System of Units (SI). One kilometer per second equals 1,000 meters per second (m/s).
Frequently asked questions
How many kilometers per second are in one mile per hour?
There are 0.00044704 kilometers per second in one mile per hour, and this value is exact by definition.
How do I convert miles per hour to kilometers per second?
Multiply the number of miles per hour by 0.00044704. For example, 10 mph × 0.00044704 = 0.0044704 km/s.
How many miles per hour are in one kilometer per second?
One kilometer per second equals 2,236.936292 miles per hour. That is the reverse factor, 1 ÷ 0.00044704.
What is 10 miles per hour in kilometers per second?
10 mph = 0.0044704 km/s.
Is this mph to km/s converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.
Convert miles per hour to other units
- Miles per hour to kilometers per hour
- Miles per hour to meters per second
- Miles per hour to knots
- Miles per hour to feet per second
- Miles per hour to Mach