Question 1

What is the difference between km/h and mph?

Accepted Answer

Kilometers per hour (km/h) is the metric standard. Miles per hour (mph) is used in the US, UK, and a few other countries. 1 km/h ≈ 0.6214 mph.

Question 2

What are knots?

Accepted Answer

A knot equals one nautical mile per hour (1.852 km/h). Used in aviation and maritime navigation. Named after the old practice of counting knots on a rope.

Question 3

How fast is the speed of light?

Accepted Answer

Light travels at approximately 299,792 km/s or about 1,079,252,849 km/h — roughly 874,030 times faster than a commercial jet.

Question 4

What is m/s used for?

Accepted Answer

Meters per second (m/s) is the SI unit of speed. Used in science, engineering, and physics. 1 m/s = 3.6 km/h.

Question 5

How do I convert online free?

Accepted Answer

Pick the from and to units above and the result appears instantly. Free, no sign-up, works on mobile.

Question 6

Which units are supported?

Accepted Answer

All common units are supported. Choose from the dropdowns above for an instant free conversion.