Convert 9 mph to kph

How to convert miles per hour to kilometers per hour

1. Formula: kilometers per hour = miles per hour × 1.609344
2. Put in the value: 9 miles per hour.
3. Result: 14.484096 kilometers per hour.

Miles per hour to kilometers per hour table

Converting the other way: kilometers per hour to miles per hour

miles per hour = kilometers per hour × 0.62137119. So 14.484096 kilometers per hour is back to 9 miles per hour; one kilometer per hour is 0.62137119 miles per hour. See the kilometers per hour to miles per hour table.

Quick estimate in your head

For a rough answer, multiply by about 1.6: 9 × 1.6 ≈ 14.4 kph, against the exact 14.484096 kph (0.6% out). Good enough to check that a calculated result is sensible.

Common mistakes

The usual slip is using the factor the wrong way round. A mile per hour is bigger than a kilometer per hour, so the number of kilometers per hour must come out larger than the number of miles per hour. If your answer goes the other way, divide instead of multiplying.

About the units

Mile per hour (mph) and kilometer per hour (kph) are both units of speed. One mile per hour equals 1.609344 kilometers per hour, and one kilometer per hour equals 0.62137119 miles per hour. Results on this page are rounded for display; the conversion itself uses the exact definitions.

Speed conversions come up when driving abroad, in running and cycling paces, weather and wind reports, and sailing and flying.

9 miles per hour in other units

The most readable unit for this amount is meters per second (4.02336).

• 4.02336 mps
• 14.484096 kph
• 7.820786 kn
• 13.2 fps