Speed, Distance & Time Calculator
Solve for speed, distance or time when you know the other two.
About the Speed, Distance & Time Calculator
Choose what to find (speed, distance or time) and enter the other two. The result also gives the speed in mph and the time in hours and minutes, which is handy for planning a drive, a run or a school problem.
Average speed is distance divided by time. Rearranged, distance = speed × time and time = distance ÷ speed. Keep units consistent: km and hours give km/h. One mile is exactly 1.609344 km.
The formula
speed = distance ÷ time
- speed
- in km/h
- distance
- in km
- time
- in hours (2.5 h = 2 h 30 min)
Worked example
A 200 km drive at an average of 80 km/h
- Time = 200 ÷ 80 = 2.5 hours
- = 2 h 30 min
- Covering 150 km in that time instead means 150 ÷ 2.5 = 60 km/h
Things to keep in mind
- Gives the average for the whole trip; stops and traffic lower it.
- For minutes, divide by 60 first: 45 min = 0.75 h.
Questions people ask
How do I convert km/h to m/s?
Divide by 3.6.
Is this average or top speed?
Average speed over the whole trip, including any stops.
How do I convert minutes to hours?
Divide by 60: 90 minutes is 1.5 hours.