Speed, Distance and Time Calculator

Fill in any two of distance, speed and time, and leave the third blank. The calculator works out the missing one.

This result is an estimate only. Double-check important figures before relying on them.

How it is calculated

Speed = distance ÷ time
Distance = speed × time
Time = distance ÷ speed
Time is entered as hours and minutes and used as hours + minutes ÷ 60
Metres per second = km/h ÷ 3.6

To turn a distance into miles, use the miles to kilometers converter. For the cost of a trip, use the fuel cost calculator.

Worked example

A 150 km trip in 2 hours: 150 ÷ 2 = 75 km/h
Driving at 60 km/h for 1 hour 30 minutes: 60 × 1.5 = 90 km
A 100 km trip at 80 km/h: 100 ÷ 80 = 1.25 hours, which is 1:15

Why your number may differ

This is an average. Real journeys include traffic, stops and changes of speed. Use one set of units throughout; mixing miles with kilometers or minutes with hours gives wrong answers.

Frequently asked questions

What is the formula for speed, distance and time?

Speed = distance ÷ time, distance = speed × time, and time = distance ÷ speed. Use the same units, such as km, km/h and hours.

How do I convert km/h to metres per second?

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

Is this average speed?

Yes. It uses the whole distance and the whole time, so stops and slowdowns are included in the average.