Speed Converter

Convert speed units instantly in your browser

Enter a speed value and choose your source and target units — the result updates as you type. Five units are supported: meters per second (m/s, the SI base unit), kilometers per hour (km/h), miles per hour (mph), knots (nautical miles per hour), and feet per second (ft/s). Nothing is sent to a server; every calculation runs locally in your browser.

All conversions go through m/s as the base unit. Knots are defined as exactly 1.852 km/h. Feet per second use the international foot (0.3048 m exactly). Results are displayed to seven significant digits to avoid floating-point noise while staying accurate for everyday use. The swap button lets you quickly reverse a conversion direction.

FAQ

What is a knot? A knot is one nautical mile per hour, equivalent to approximately 1.852 km/h or 1.151 mph. It is used in aviation and maritime navigation.

How many km/h is 100 mph? 100 mph is approximately 160.934 km/h. Enter 100 in the value field, set From to mph, and To to km/h to see the result.