Speed Converter
Convert between miles per hour, kilometers per hour, meters per second, feet per second, knots, and Mach instantly. All processing happens client-side.
Common Reference Speeds
Click a card to load it as input
How to Use the Speed Converter
- Enter a speed value in the input field.
- Select the unit you are converting from (e.g., mph, km/h, knots).
- Converted values for all other units appear instantly below.
- Click any reference point to load it as the input value.
Speed Units Explained
Miles per hour (mph) is used in the US and UK for road speeds. Kilometers per hour (km/h) is the standard in most other countries. Knots are used in aviation and maritime navigation. Mach numbers express speed relative to the speed of sound (approximately 343 m/s at sea level and 20 degrees Celsius).
Features
- Real-time conversion between 6 speed units
- Conversion formulas displayed for each unit pair
- Quick-access common reference speeds
- One-click copy of any result
- 100% client-side processing for full privacy
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Disclaimer: This tool is provided as-is for informational and educational purposes only.