Speed, Distance and Time Calculator
Find the travel time, the distance or the average speed from the other two.
Good to know. Driving at 110 instead of 100 km/h on a 300 km trip saves about 16 minutes. Less, once there’s traffic.
How it works
In plain words
Speed is distance divided by time. Rearrange it for the one you need: time is distance divided by speed, and distance is speed multiplied by time.
The formula
time = distance ÷ speed distance = speed × time speed = distance ÷ time
Worked example
300 km at an average of 100 km/h takes 300 ÷ 100 = 3 hours: 3 h 00 min.
Sources
No outside data or rates: this is plain arithmetic.
6 automated tests check its answers on every change.
About the speed, distance and time calculator
Speed, distance and time are linked by one formula, speed = distance ÷ time, and any two of them give you the third. Choose what you want to work out, enter the other two, and the answer appears in hours and minutes, in kilometres or miles, or as an average speed.
For planning a trip, use a realistic average speed, not the speed limit. Stops, traffic, towns and junctions pull the average well below the highest speed you drive: 80 to 90 km/h (50 to 55 mph) is typical for a motorway trip with a break. Route planners estimate this for you, but the calculator is handy when you only know the distance.
Going faster saves less time than people expect. On a 300 km trip, 110 km/h instead of 100 km/h saves about 16 minutes, and uses noticeably more fuel. On a 30 km commute, the same increase saves less than two minutes.
The pace, shown as minutes per kilometre or mile, is how runners, cyclists and hikers usually think about speed. A 5:00 min/km pace is 12 km/h. For running times and race predictions, the pace calculator has more detail.
Questions people ask
How do I calculate travel time?
Divide the distance by the average speed. 300 km at 100 km/h takes 3 hours.
How do I calculate average speed?
Divide the distance by the time taken. 150 km in 2 h 30 min is 60 km/h.
How far do I go in a given time?
Multiply the speed by the time in hours. 2.5 hours at 60 mph is 150 miles.