TOOLConvert speed and velocity units
Convert between miles per hour, kilometers per hour, meters per second, knots and feet per second instantly. It's the quick answer for reading a foreign speed limit, comparing wind or vehicle speeds, or converting a physics result — with the exact rate shown below each conversion.
Common speed conversions
1 mph ≈ 1.60934 km/h · 1 m/s = 3.6 km/h · 1 knot ≈ 1.852 km/h · 60 mph ≈ 96.56 km/h
These are based on the exact definitions (1 mile = 1609.344 m, 1 nautical mile = 1852 m), so the conversions are precise.
Frequently asked questions
How do I convert mph to km/h?
Multiply miles per hour by 1.609344 to get kilometers per hour. For example, 60 mph is about 96.56 km/h.
What is a knot?
A knot is one nautical mile per hour, used in aviation and at sea. One knot equals about 1.852 km/h or 1.151 mph.
How do I convert m/s to km/h?
Multiply meters per second by 3.6 to get kilometers per hour. So 10 m/s is 36 km/h.