Unit Converters
Speed Converter
Convert between mph, km/h, m/s, and knots.
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About the Speed Converter
Convert speed units free — mph to km/h, km/h to mph, m/s to mph, and knots to mph — with every unit updating as you type (1 mph ≈ 1.609 km/h; 1 knot ≈ 1.852 km/h). Useful for driving abroad, comparing wind speeds, running pace math, aviation, and physics homework.
How to use the Speed Converter
- 01Enter a value.
- 02Pick the unit to convert from.
- 03Read every other unit and copy.
Frequently asked questions
How many km/h in 1 mph?
1 mph ≈ 1.609 km/h.
What is a knot?
1 knot = 1 nautical mile per hour ≈ 1.852 km/h.
What is 100 km/h in mph?
About 62 mph — the standard highway speed limit in much of the world. Reverse rule of thumb: mph × 1.6 ≈ km/h.