Speed Converter
Convert speed between miles per hour, kilometers per hour, meters per second, knots, and feet per second. Instant results.
Converted Speed
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How to Use This Calculator
- Enter the speed value.
- Select your source speed unit.
- Select your target speed unit.
- The converted speed is shown instantly.
Formula
All conversions go through meters per second (m/s) as the base unit:
1 mph = 0.44704 m/s | 1 km/h = 0.27778 m/s | 1 knot = 0.51444 m/s
Example
Example: Convert 100 km/h to mph:
100 × 0.27778 / 0.44704 = 62.137 mph
Frequently Asked Questions
- 60 mph = 96.56 km/h. To convert mph to km/h, multiply by 1.60934.
- One knot equals 1.852 km/h. Knots are used in aviation and maritime navigation.
- The speed of sound at sea level is approximately 343 m/s = 1235 km/h = 767 mph = 1 Mach.
- Multiply meters per second by 3.6. For example, 10 m/s = 36 km/h.
- Common limits: 30 mph = 48 km/h (residential), 60 mph = 97 km/h (highway), 70 mph = 113 km/h (motorway).