Speed Converter
Convert speeds between km/h, mph, m/s, knots and ft/s instantly.
Speed Converter
Convert speeds between km/h, mph, m/s, knots and ft/s instantly.
About this tool
Convert mph to km/h: try 60 mph
Choose Mile per Hour (mph) as the source unit and enter 60. Read 96.56064 in the km/h result, or about 96.56 km/h. The formula is km/h = mph × 1.609344. The selected unit describes your input; every result row shows the same speed in another unit.
Convert km/h to mph: reverse the calculation
Choose Kilometer per Hour (km/h) and enter 100. The mph result is about 62.13712, or 62.14 mph rounded to two decimal places. Divide by 1.609344 for this direction. Switching the source unit keeps the number you entered: changing 60 mph to an input of 60 km/h asks a different question, rather than converting the input field itself.
Exact factor, rounded display
One international mile is exactly 1.609344 km, so the mph–km/h factor is exact. Result rows display up to seven significant digits, and copying a row copies that displayed value. Re-enter the original value when you need another conversion to avoid accumulating rounding differences. Enter numbers only, with a decimal point if needed; leave unit labels and thousands separators out of the input.
FAQ
Common questions and answers about this topic.
Why is Mach not included?
The speed of sound changes with temperature and altitude — about 340 m/s at sea level on a 15°C day, but roughly 295 m/s at cruising altitude. A single fixed factor would look precise while being wrong, so this tool leaves Mach out rather than pretending.
What exactly is a knot?
One knot is one nautical mile per hour, which is exactly 1.852 km/h. It is the standard unit in shipping and aviation because a nautical mile matches one minute of latitude on a chart.
How do I convert km/h to m/s in my head?
Divide by 3.6. So 36 km/h is 10 m/s, and 100 km/h is about 27.8 m/s. Going the other way, multiply by 3.6.