Speed Converter
Convert between m/s, km/h, mph, knots, and ft/s
1 Kilometers per hour = 0.621372 Miles per hour
What is the Speed Converter?
Written and maintained by the BitConvert team · Feb 27, 2026
The BitConvert Speed Converter switches velocity values between the five units people meet most often: meters per second, kilometers per hour, miles per hour, knots, and feet per second. Enter a speed, choose your units, and the result appears instantly.
The conversion factors are exact where they can be: 1 km/h is 0.277778 m/s, 1 mph is 0.44704 m/s, and 1 knot is 0.514444 m/s (one nautical mile per hour, or about 1.852 km/h). This makes it simple to compare, say, a 100 km/h speed limit at 62.14 mph, or to understand an aircraft's airspeed in knots against ground speed in mph. You can raise the decimal precision when you need fine detail or lower it for a quick estimate.
Key Features
Five Units
Convert between m/s, km/h, mph, knots, and feet per second in one place.
Nautical Knots
Includes knots (nautical miles per hour) for aviation and maritime use.
Adjustable Precision
Choose 2 to 10 decimal places to fit rough estimates or exact figures.
Instant Swap
Reverse the source and target units with a single click to flip any conversion.
Common Use Cases
Convert a foreign speed limit from km/h to mph before driving abroad. Compare running or cycling pace between m/s and km/h. Read aviation or sailing speeds given in knots against km/h or mph. Translate wind-speed reports between m/s, km/h, and mph, or check the speed of sound (about 343 m/s) expressed in other units. Compare vehicle top speeds listed in km/h and mph, and convert boat or ferry speeds from knots into figures your passengers recognize.
Frequently Asked Questions
Last updated: Feb 27, 2026