Speed Calculator

Calculate speed, distance, or time using various standard units.

How to Use Speed Calculator

  1. Choose what you want to calculate: speed, distance or time.
  2. Fill in the two values you know, picking units for each. You can mix them, for example miles with km/h.
  3. Click Calculate. Speed is shown in km/h, mph and m/s, distance in km, miles and metres, and time in hours, minutes and seconds.

The formula

Speed = distance ÷ time, distance = speed × time, and time = distance ÷ speed. The catch is always the units: the calculator converts everything to metres and seconds before doing the maths, so mixing kilometres, miles, km/h and mph gives correct answers. Running 10 km in 50 minutes is 12 km/h, or about 7.46 mph.

The result is an average speed over the whole distance. Real journeys speed up and slow down, so allow extra time for stops and traffic.

Handy conversions

1 mile = 1.609344 km exactly. 1 m/s = 3.6 km/h, which is about 2.24 mph. 100 km/h is about 62.1 mph.

Key Features & Practical Use Cases

  • Working out the average speed of a run, ride or drive.
  • Estimating how long a journey will take at a given speed.
  • Finding how far you'll get in a set time.
  • Solving speed, distance and time problems in physics homework.

Frequently Asked Questions

How do I calculate average speed?

Divide the total distance by the total time. Choose Speed, enter both, and click Calculate.

How long does it take to drive 300 km at 90 km/h?

3 hours 20 minutes, ignoring stops. Choose Time, enter 300 km and 90 km/h.

Can I use minutes and seconds?

Yes. Time is entered as hours, minutes and seconds, so 1 hour 30 minutes is 1 and 30.

How do I convert km/h to mph?

Divide by 1.609. The calculator shows speed results in both units automatically.

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