Speed Converter
Convert speeds between km/h, mph, m/s and knots.
Result
Converted speed
62.137
How it works
Every speed unit is a distance over a time, so all conversions route through one reference: the metre per second. This converter translates between km/h, mph, m/s and knots by converting to m/s and back out. The key ratios are worth keeping in your head: 1 m/s = 3.6 km/h, 1 mph = 1.609 km/h, and 1 knot = 1.852 km/h — the knot being one nautical mile per hour, the natural unit of sea and air navigation. Quick anchors: a 100 km/h motorway limit is about 62 mph or 28 m/s; a sprinter at 10 m/s runs 36 km/h; a 500-knot airliner cruises at 926 km/h. When converting mentally, km/h to m/s is "divide by 3.6" — handy for physics problems that demand SI units.
Advertisement
Frequently asked questions
How fast is 100 km/h in mph?
About 62 mph — multiply km/h by roughly 0.621.
What is a knot?
One nautical mile per hour, about 1.852 km/h, used at sea and in aviation.
Why do sailors and pilots use knots?
A knot is one nautical mile per hour, and a nautical mile is one minute of latitude — so speeds in knots map directly onto navigation charts. The name comes from counting knots on a rope paid out behind old ships.
Advertisement