Convert speed and velocity between all major units instantly. Real-world context hints show you what each speed feels like — from walking pace to supersonic travel.
Try:
Result
—
All Units
Unit
Value
How to use
Enter a speed value in the input field.
Select the unit you are converting from (e.g. km/h).
Select the target unit (e.g. mph) — the result appears immediately.
A context hint below the result shows a real-world analogy for that speed.
The table at the bottom shows the value in all available units.
Frequently Asked Questions
How fast is 100 km/h in mph?
100 km/h equals approximately 62.14 mph. A quick rule of thumb: divide km/h by 1.609 to get mph.
What is 1 knot in km/h?
1 knot equals 1.852 kilometres per hour. Knots are used in aviation and marine navigation.
How fast is the speed of sound?
The speed of sound in dry air at 20°C is approximately 343 m/s, or 1,235 km/h (767 mph).
What is the fastest speed ever recorded by a human?
The fastest humans have travelled was during the Apollo 10 mission in 1969, reaching about 39,897 km/h (24,791 mph) during re-entry.
How many m/s is 60 mph?
60 mph equals approximately 26.82 m/s or 96.56 km/h.
Did you know?
The speed of light in a vacuum is exactly 299,792,458 m/s — a distance it can travel 7.5 times around Earth in one second.
A cheetah, the fastest land animal, can sprint at about 112 km/h (70 mph) in short bursts.
Commercial passenger jets cruise at around 900 km/h (560 mph), just below the speed of sound.