OTHER · SPEED CONVERTER
Speed Converter Calculator
Convert between metres per second, kilometres per hour, miles per hour, feet per second, and knots. Uses exact NIST-defined conversion factors.
1.6093
km/h
1 mph = 1.6093 km/h
About This Calculator
Convert speed between metric, imperial, and nautical units. All factors are exact, derived from the 1959 international length definitions and the SI second.
How It Works
Each speed unit's factor is the unit's exact equivalent in metres per second. The converter multiplies by the source factor and divides by the target factor.
The Formula
result = value × factor(from) ÷ factor(to), where each factor is the unit's exact speed in m/s (e.g. 1 mph = 1609.344/3600 m/s; 1 knot = 1852/3600 m/s).
Frequently Asked Questions
- How many km/h in one mph?
- Exactly 1.609344 km/h — derived from 1 mi = 1609.344 m (exact) divided by 3600 s/h.
- What is a knot?
- One knot is one nautical mile per hour = 1852/3600 m/s ≈ 1.852 km/h. Used in aviation and maritime navigation.