Speed Converter
Convert between km/h, mph, m/s, knots, and Mach.
What is a Speed Converter?
A Speed Converter calculates velocity across different measurement contexts. While a car speedometer reads km/h or mph, a pilot relies on Knots or Mach numbers, and a physicist works in meters per second (m/s). This tool bridges those worlds.
Speed isn't just distance over time; it's the language of movement in different industries. On land, the world is divided between Kilometers per Hour (global standard) and Miles per Hour (US/UK). At sea and in the air, 'Knots' (nautical miles per hour) is the universal standard because it correlates with the Earth's latitude.
For high-speed aviation and ballistics, we use 'Mach'—the speed of sound. Mach 1 (approx 1235 km/h at sea level) is the sound barrier. Commercial jets cruise around Mach 0.8, while fighter jets can exceed Mach 2. Our converter relies on the 'Standard Atmosphere' model (15°C at sea level) for Mach calculations.
1How to Use
- Type the speed value (e.g., 65).
- Select the 'From' unit (e.g., MPH for a car speed).
- Select the 'To' unit (e.g., Meters per Second).
- The exact conversion appears instantly.
- Use the swap button to check the reverse (e.g., what is 100 m/s in MPH?).
★Key Features
- 5 Key Units: KM/H (Land), MPH (US/UK Roads), Knots (Sea/Air), M/S (Physics), and Mach (Supersonic).
- Mach Accuracy: Uses the standard speed of sound (343 m/s) for Mach conversions.
- Physics Ready: Meters per Second (m/s) is the SI unit for all scientific calculations.
- Instant & Precise: No page reloads; 6-decimal precision for technical use.