Speed Converter
Enter a speed value and select the source and target units to convert between five common speed units: meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots, and feet per second (ft/s). The result updates instantly as you type.
Km/h and mph are the everyday units for road speeds in metric and imperial countries respectively. Knots are used in aviation and maritime navigation (1 knot = 1 nautical mile per hour). Meters per second is the SI standard for physics. Feet per second is used in some engineering contexts.
Useful for travel, aviation, physics homework, and sports. All conversions happen in your browser.
By The Paper Room Editorial Team — Converter Tools
Frequently asked questions
How do I convert km/h to mph?▼
Divide by 1.60934. For example, 100 km/h is approximately 62.14 mph. For a rough estimate, multiply km/h by 0.6.
What is a knot?▼
A knot is one nautical mile per hour, which equals approximately 1.852 km/h or 1.151 mph. Knots are the standard speed unit in aviation and maritime navigation worldwide.
What is the speed of sound in these units?▼
The speed of sound at sea level and 20 C is approximately 343 m/s, 1,235 km/h, 767 mph, 667 knots, or 1,125 ft/s.