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Speed Distance Time Calculator

Solve speed, distance or time — enter the two you know.

Calculated locally in your browser.

Understanding your result

This gives average speed over the whole journey, not instantaneous speed.

Formula and method

Speed = Distance ÷ Time, Distance = Speed × Time, Time = Distance ÷ Speed.

Worked example

Travelling 100 km in 2 hours is an average speed of 50 km/h.

How to use this tool

  1. Enter any two of distance, time and speed.
  2. Leave the unknown blank.
  3. Press Calculate.

Common mistakes to avoid

  • Mixing units, such as minutes with km/h.

About the Speed Distance Time Calculator

Work out average speed, distance travelled or time taken from the two values you already know.

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Frequently asked questions

Can I use minutes?

Enter time in hours (for example 90 minutes = 1.5). The result is in km/h.