Speed Converter

Convert between km/h, mph, m/s, and knots instantly. Free online speed conversion tool.

How It Works

  1. Select the speed unit you want to convert from (e.g., km/h or mph).
  2. Enter the speed value in the input field.
  3. Select the target unit.
  4. All converted values are displayed instantly.

Formula

1 km/h  = 0.62137 mph = 0.27778 m/s = 0.53996 kn
1 mph   = 1.60934 km/h = 0.44704 m/s = 0.86898 kn
1 m/s   = 3.6 km/h = 2.23694 mph = 1.94384 kn
1 knot  = 1.852 km/h = 1.15078 mph = 0.51444 m/s
Mach 1 ≈ 1,234.8 km/h (at sea level, 15 °C)

Example

Input: 100 km/h
Result: 62.14 mph / 27.78 m/s / 53.996 kn

FAQ

Mach 1 is approximately 1,234.8 km/h (767.3 mph) at sea level and 15 °C. The exact value varies with altitude and temperature.

A knot is one nautical mile per hour (1.852 km/h). It is the standard unit for ship and aircraft speeds.

Yes. 1 mph = 1.60934 km/h, so 60 mph ≈ 96.6 km/h.

No. All conversions happen entirely in your browser. Nothing is sent to our servers.