Speed converter
ConvertersNo. 16 / 24approved
One value, every speed — metres per second, km/h, mph, feet per second and knots. The three languages of "please don't speed".
100 km/h ≈ 62 mph ≈ 28 m/s. pick your favourite denial.
work surface
Math, not advice — results are indicative. Read the disclaimer.
most-used utilities
City limit
30 mph. The speed limit that teaches everyone patience.
Highway cruise
75 mph. The road's favourite cruising speed.
Interstate
65 mph. The American highway's opinion of Europe's 120.
Brisk run
6 mph. Fast enough to look athletic, slow enough to keep talking.
Sprint record
9.58 m/s. The world record, briefly and gloriously.
Jet cruise
560 mph. The plane's commute, above the clouds.
pro tips
km/h to m/s: divide by 3.6. mph to km/h: multiply by 1.609. Your odometer will thank you.
A knot is a nautical mile per hour — the sea's way of keeping its distance private.
Rough math: 100 km/h ≈ 62 mph ≈ 28 m/s. The three languages of "please don't speed".
what it does
Type a number, pick its unit, and every other speed unit updates at the same time. Metres per second, kilometres per hour, miles per hour, feet per second and knots — the whole speedometer in one screen.
The conversion runs through metres per second, the unit the physics people quietly agree on. Click any result to copy that particular value, because someone will always ask for the number in mph.
Handy for driving, running, aviation and the eternal "is that fast or is that a boat?" — the question that splits speeders and sailors.
Use it when the speed signs speak kilometres and your car's brain speaks miles, when the treadmill says km/h but your training plan says pace per mile, or when the weather report throws a "knots" at you and the boat in question is your commute. One value, every unit at once — click any result to copy it and keep your eyes on the road.
quick answers
How do you convert km/h to mph?
Divide by 1.609. 100 km/h is about 62 mph — the widget shows it and every other unit at once.
What is a knot?
One nautical mile per hour, about 1.852 km/h. It's what boats, planes and weather reports use so everyone can be slightly confused.
How do you get m/s from km/h?
Divide by 3.6. It's the unit the physics people reach for when speed starts to matter.
Why show feet per second?
For the engineers, the sports nerds and anyone timing a fast object on a runway. It rounds out the speedometer.