Speed Conversion Calculator
Convert speed between mph, km/h, m/s, knots, feet/second, and other velocity units instantly.
Calcady™ · Calculation Report Speed Converter calcady.com Velocity Converter96.5607 Converted Speed96.5607 Kilometers per Hour (km/h) |
Quick Answer: Common Speed Conversions
1 mph = 1.60934 km/h. 1 km/h = 0.62137 mph. 1 knot = 1.15078 mph = 1.852 km/h. 1 m/s = 2.237 mph. Multiply mph by 1.609 to get km/h. Multiply km/h by 0.621 to get mph.
Speed Conversion Reference
| MPH | km/h | m/s | Knots |
|---|---|---|---|
| 30 | 48.3 | 13.4 | 26.1 |
| 60 | 96.6 | 26.8 | 52.1 |
| 75 | 120.7 | 33.5 | 65.2 |
| 100 | 160.9 | 44.7 | 86.9 |
| 200 | 321.9 | 89.4 | 173.8 |
Frequently Asked Questions
Why do ships and aircraft use knots instead of mph?
A knot is one nautical mile per hour, and a nautical mile equals one minute of latitude. This makes navigation calculations trivial — traveling at 30 knots for 2 hours covers 1 degree of latitude. Speed in knots translates directly to chart distance without conversion, which is critical for oceanic navigation and air traffic control.
Why does science use m/s instead of km/h?
Meters per second is the SI base unit for velocity. Using m/s keeps physics equations clean — F = ma uses kg, m/s², and newtons without conversion factors. The speed of light (299,792,458 m/s) and sound (343 m/s at 20°C) are defined in m/s. Converting to km/h introduces unnecessary factors of 3.6.