Speed, Distance and Time Calculator
Find the speed, the distance, or the travel time of a trip when you know the other two. Choose what you want to calculate, enter the rest, and see the result in miles and kilometers.
Travel time
2 h 30 min 0 s
Check the highlighted fields to see your result.
- Speed
- 60 mph
- Distance
- 150 miles
- Speed in km/h
- 96.56
- Distance in km
- 241.4
Results are estimates for information only and do not constitute financial, medical, or legal advice.
How it works
Speed, distance, and time are linked by one simple rule: speed is how much distance you cover in a given time. Know any two and you can find the third. The calculator works in hours internally, so it can combine hours, minutes, and seconds.
The formulas
Speed = distance ÷ time
Distance = speed × time
Time = distance ÷ speed
Worked example
You drive 150 miles at an average of 60 mph. How long does it take?
- Time = 150 ÷ 60 = 2.5 hours.
- 0.5 hours is 30 minutes, so the trip takes 2 hours 30 minutes.
- In kilometers, that is 241.4 km at 96.6 km/h.
Frequently asked questions
How do I calculate average speed?
Divide the total distance by the total time. If you drove 150 miles in 2.5 hours, your average speed was 150 ÷ 2.5 = 60 mph. Stops count as time, so your average speed is usually lower than the speed on your speedometer.
How do I enter minutes and seconds?
Use the hours, minutes, and seconds boxes. You can leave any of them at 0. For example, 1 hour 30 minutes is the same as 1.5 hours; the calculator converts it for you.
Can I mix miles and kilometers?
Pick the units that match your numbers (miles and mph, or kilometers and km/h). The result also shows the same speed and distance in the other system, so you can convert at the same time.