Speed Converter
Type any value — all units update instantly
What is speed conversion?
Speed measures how fast an object moves. km/h is standard in India and most of the world. mph is used in the US and UK. m/s is used in physics. Knots are used in aviation and maritime navigation.
Formula used
Base: km/h
1 km/h = 0.6214 mph = 0.2778 m/s = 0.5400 knots
Key reference speeds:
Walking: 5 km/h | Cycling: 25 km/h
City speed limit (India): 50 km/h
Highway (India): 100–120 km/h
Sound (sea level): 1,235 km/h = Mach 1
How to use this calculator
- Type any value into any field
- All other units update instantly
Example
Common speed comparisons:
| Context | km/h | mph | m/s |
|---|---|---|---|
| Walking | 5 | 3.1 | 1.4 |
| Cycling | 25 | 15.5 | 6.9 |
| Highway limit | 100 | 62.1 | 27.8 |
| Bullet train | 320 | 199 | 88.9 |
Frequently asked questions
The speed of sound ≈ 1,235 km/h (767 mph) at sea level. Aircraft above Mach 1 are supersonic.
Knots (nautical miles/hour) are based on nautical miles defined as one arc-minute of latitude, simplifying navigation. 1 knot = 1.852 km/h.
1 mph = 1.609 km/h. So 60 mph = 96.6 km/h. The US/UK speed signs in mph show lower numbers but are higher speeds than the same number in km/h.