Quick Reference
1 mph = 1.60934 km/h = 0.44704 m/s
1 km/h = 0.62137 mph = 0.27778 m/s
1 m/s = 3.6 km/h = 2.23694 mph
1 knot = 1.852 km/h = 1.15078 mph
Common Reference Points
- Walking pace: ~3 mph (4.8 km/h)
- Cycling pace: ~15 mph (24 km/h)
- Highway driving: 60–70 mph (96–113 km/h)
- Commercial aircraft: ~575 mph (925 km/h, ~0.85 Mach)
- Speed of sound (sea level): ~767 mph (1,235 km/h)
Frequently Asked Questions
How do I convert mph to km/h?
Multiply by 1.60934. A quick mental approximation: multiply by 1.6 (or by 8 and divide by 5). So 60 mph × 1.6 ≈ 96 km/h.
What is a knot?
A knot is one nautical mile per hour. One nautical mile is 1,852 meters (slightly longer than a statute mile). Knots are used in aviation and maritime navigation.
How fast is Mach 1?
Mach 1 is the speed of sound, approximately 343 m/s (767 mph / 1,235 km/h) at sea level and 20°C. The speed of sound decreases at higher altitudes where the air is colder and less dense.