Speed Converter
Convert between common speed and velocity units instantly. Enter a value, choose your unit, and see all conversions at once.
How to Use the Speed Converter
Converting between speed units takes just a few steps:
- Enter a speed value in the input field. Decimals are fully supported.
- Select the source unit from the dropdown (m/s, km/h, mph, knots, ft/s, or Mach).
- View all conversions instantly in the results table. The tool calculates as you type.
- Click Copy next to any result to copy it to your clipboard.
About Speed Units
Speed measures how quickly an object changes its position. The SI unit is meters per second (m/s), but kilometers per hour (km/h) and miles per hour (mph) are far more common in daily life. Knots, used in aviation and maritime contexts, equal one nautical mile per hour. The Mach number represents speed relative to the speed of sound, approximately 343 m/s at sea level.
Key conversions include: 1 km/h = 0.27778 m/s, 1 mph = 0.44704 m/s, 1 knot = 0.51444 m/s, and Mach 1 = 343 m/s (at standard conditions). These conversions are vital for driving, aviation, weather forecasting, physics, and sports science.
Frequently Asked Questions
Divide the km/h value by 1.60934 to get mph, or multiply by 0.621371. For example, 100 km/h × 0.621371 = 62.14 mph.
Mach 1 is the speed of sound, approximately 343 m/s (1,235 km/h or 767 mph) at sea level and 20°C. Speeds above Mach 1 are called supersonic.
Knots are used in maritime and aviation navigation. One knot equals one nautical mile per hour, or approximately 1.852 km/h (1.15078 mph).