Conversions
Speed Converter
Switch common speed units like kilometers per hour, miles per hour, and meters per second in one place.
speedmphkm/h
Speed Converter
Convert between kilometers per hour, miles per hour, and meters per second.
Kilometers/hour
90
Miles/hour
55.92
Meters/second
25
Speed conversion factors
1 mph = 1.60934 km/h and 1 m/s = 3.6 km/h. The calculator chains these constants to derive every result.
How to use
- Enter a speed value.
- Pick the unit that matches the value you entered.
- Read the equivalent speeds in the remaining units.
Example
Input: Speed = 90 km/h
Output: ≈ 55.92 mph, ≈ 25.00 m/s
FAQ & notes
Can I convert knots?
Knots aren't included in the default set. Multiply knots by 1.852 to get km/h, then use the converter for other units.
Why does m/s show repeating decimals?
Many conversions produce repeating decimals; the tool rounds to four places for readability.