Speed Converter

1. Type a speed in any unit. Enter a value in m/s, km/h, mph, ft/s, knots, or Mach. All other fields update immediately.
2. Use the quick-reference presets. The buttons below the grid let you instantly load common speeds: walking pace, city driving, highway speed, and the speed of sound.
3. Compare all units side by side. Useful when working with mixed-unit data, like matching a wind speed in knots to a speed limit in mph, or comparing an aircraft's Mach number to km/h.
4. Note on Mach number. Mach 1 varies with altitude and temperature. This converter uses the standard sea-level value of 340.29 m/s (1,235 km/h).

Example: a car traveling at 65 mph. Type 65 in the mph field to see: 29.06 m/s, 104.607 km/h, 95.333 ft/s, 56.539 kn, 0.08541 Mach.

All conversions use meters per second (m/s) as the base unit:

Value in m/s = Input × toMetersPerSecond factor
Result = Value in m/s ÷ toMetersPerSecond factor

Common reference speeds:

• Human walking: 1.2 to 1.6 m/s (2.7 to 3.6 mph)
• Olympic sprint (100 m world record): ~10.44 m/s (37.6 km/h, 23.4 mph)
• Highway driving: 26.8 m/s (60 mph, 96.6 km/h)
• Commercial aircraft cruise: 250 m/s (900 km/h, 559 mph, Mach 0.82)
• Speed of sound at sea level (20°C): 343 m/s (1,235 km/h, 767 mph)
• Earth orbital speed: 7,900 m/s (28,440 km/h, Mach 23)