Physics

Speed, Distance and Time Calculator

Pick what you want to find and enter the other two values.

By TheCalcTools Updated Formula checked and tested

Your numbers

Your results

Speed (km/h)
Speed (km/h)
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Speed (m/s)
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Speed (mph)
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Distance (km)
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Time (hours)
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Speed, Distance and Time Calculator by TheCalcTools

How the Speed, Distance and Time Calculator works

Choose the quantity to solve for, then enter the other two.

Speed is distance divided by time; the other two follow by rearranging.

Speed is also shown in m/s and mph.

The formula

speed = distance ÷ timedistance = speed × time

Worked example

Using the default values shown in the calculator:

Solve forSpeed
Speed (km/h)75
Distance (km)150
Time (hours)2
  1. Distance 150 km in 2 hours.
  2. Speed = 150 ÷ 2 = 75.00 km/h.
  3. That is 20.83 m/s, or 46.60 mph.

Result:

Speed (km/h)75.00
Speed (m/s)20.83
Speed (mph)46.60
Distance (km)150.00
Time (hours)2.000

Frequently asked questions

Is this average speed?

Yes. It assumes a constant speed or gives the average over the journey. Stops and traffic lower the average.

How do I convert km/h to m/s?

Divide by 3.6. For example 72 km/h is 20 m/s.

Sources and further reading

Acceleration CalculatorFind acceleration from a change in speed over time Free Fall CalculatorHow long does it take an object to fall, and how fast is it going when it lands? Terminal Velocity CalculatorHow fast does a falling object end up going? Projectile Motion CalculatorFind how far and how high a launched object travels Force Calculator (F = ma)Find the net force needed to accelerate a mass Centripetal Force CalculatorFind the inward force that keeps an object on a circular path

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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.