Speed Converter
Convert between km/h, mph, m/s, knots, and other speed units for travel, aviation, and sports.
Result
62.14
Formula: 100 km/h = 62.14 mph
1
Speed
2
From / To
All Conversions
Kilometers per hour100 km/h
Miles per hour62.14 mph
Meters per second27.78 m/s
Knots54 kn
Feet per second91.13 ft/s
Speed References
Walking5 km/h / 3.1 mph
Running12 km/h / 7.5 mph
Cycling25 km/h / 15.5 mph
Highway driving120 km/h / 75 mph
You May Also Like
Understanding Speed Units
Speed is measured differently depending on the context and region. Road travel, aviation, maritime, and science all have their preferred units.
Common Units:
- km/h: Kilometers per hour - used for road travel in most countries
- mph: Miles per hour - used in the US and UK for road travel
- m/s: Meters per second - SI unit, used in science
- knots: Used in aviation and maritime
Key Conversion Factors
| Conversion | Value |
|---|---|
| 1 km/h | 0.621 mph |
| 1 mph | 1.609 km/h |
| 1 m/s | 3.6 km/h |
| 1 knot | 1.852 km/h |
| Mach 1 | 1,235 km/h |
Quick mental math: To convert km/h to mph, multiply by 0.6 (or divide by 1.6). Example: 100 km/h ≈ 60 mph
Speed Limit References
| Location | km/h | mph |
|---|---|---|
| US Highway | 105-120 | 65-75 |
| German Autobahn (advisory) | 130 | 81 |
| UK Motorway | 113 | 70 |
| Japan Expressway | 100-120 | 62-75 |
Common Speed References
| Activity | km/h | mph |
|---|---|---|
| Walking | 5 | 3.1 |
| Running (jogging) | 10-12 | 6-7.5 |
| Cycling (casual) | 15-25 | 9-15 |
| City driving | 50 | 31 |
| Highway driving | 100-130 | 62-81 |
| Commercial airplane | 900 | 560 |
| Speed of sound | 1,235 | 767 |
Understanding Knots
Knots are used in aviation and maritime because they relate directly to nautical miles, which are based on the Earth's circumference.
- 1 knot = 1 nautical mile per hour = 1.852 km/h
- A cruise ship might travel at 20-25 knots
- Commercial aircraft cruise at about 450-500 knots
Understanding Mach Numbers
Mach numbers express speed relative to the speed of sound:
- Mach 1 = speed of sound ≈ 343 m/s (at sea level, 20°C)
- Mach 2 = twice the speed of sound
- Fighter jets can exceed Mach 2
- The Concorde cruised at Mach 2.04