Speed Distance Time Calculator

Solve for speed, distance, or time — enter any two to find the third.

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How it works

Enter values for any two of the three variables — speed, distance, and time — and the tool solves for the missing one using the fundamental formula distance = speed × time. You can choose speed units (km/h, mph, m/s, knots) and distance units (km, miles, meters, feet) independently. Time can be entered as hours, minutes, or seconds. All calculation runs instantly in your browser.

distance = speed × time

Common use cases

  • Working out travel time for a road trip at a given average speed.
  • Finding average speed from a race distance and finishing time.
  • Solving physics class problems involving uniform motion.

Frequently asked questions

Does this account for acceleration?

No — this tool assumes constant (uniform) speed. For problems involving acceleration, use kinematic equations instead.

Can I mix metric and imperial?

Yes — choose any unit for speed and any unit for distance. The tool converts internally before calculating.