Speed Calculator
Free online Speed Calculator.
Calculator
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
Speed = Distance / Time. Distance = Speed x Time. Time = Distance / Speed. Convert units: 1 mph = 1.609 km/h = 0.447 m/s.
Example Calculations
Road Trip
Input: Distance: 300 miles, Time: 5 hours
Result: Speed: 60 mph (96.6 km/h)
Sprint
Input: Distance: 100m, Time: 10.5 seconds
Result: Speed: 9.52 m/s (21.3 mph)
Find Distance
Input: Speed: 65 mph, Time: 3.5 hours
Result: Distance: 227.5 miles
About This Calculator
Free online speed calculator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our speed calculator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
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Frequently Asked Questions
How is speed calculated?
Speed = Distance / Time. Traveling 100 miles in 2 hours = 50 mph.
Speed vs velocity?
Speed is scalar (magnitude only). Velocity is vector (magnitude and direction).
Convert mph to km/h?
Multiply mph by 1.609. 60 mph = ~96.6 km/h.
Average vs instantaneous speed?
Average = total distance / total time. Instantaneous = speed at a specific moment (speedometer).
Speed of sound or light?
Sound: ~343 m/s at 20C. Light: ~299,792,458 m/s in vacuum.