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Speed, distance and time are bound by one simple relationship: speed = distance ÷ time. Give any two and the third follows — how fast you were going, how far you'll get, or how long a trip will take.
Choose what you're solving for, enter the two values you know, and the answer appears instantly.
How is it calculated?
The speed triangle
| Solve for | Formula |
|---|---|
| Speed | distance ÷ time |
| Distance | speed × time |
| Time | distance ÷ speed |
The units are yours: kilometres and hours give km/h, miles and hours give mph, metres and seconds give m/s. Just keep the distance and time units consistent with the speed unit you want.
Watch the time units
The most common mistake is mixing hours and minutes. A 30-minute trip is 0.5 hours, not 30, when you want km/h. Convert minutes to hours (÷ 60) or seconds to hours (÷ 3600) before entering them, or your speed will be off by a large factor.
Average vs instantaneous speed
This calculator gives *average* speed over the whole trip — total distance divided by total time. It does not capture how fast you were going at any single moment, which is what a speedometer shows. For a journey with stops, the average is always lower than the cruising speed.
Where it helps
Estimating arrival time, checking a pace, converting a run or drive into a speed, or physics homework. For running specifically, a pace calculator expresses the same idea as minutes per kilometre.
Worked example
You drive 150 km and it takes 2 hours: speed = distance ÷ time = 150 ÷ 2 = 75 km/h. Turn it around — at 75 km/h, a 240 km trip takes time = distance ÷ speed = 240 ÷ 75 = 3.2 hours, or 3 hours 12 minutes (0.2 × 60 = 12). Note the average already folds in any traffic and stops within those two hours.
FAQ
How do I calculate speed?+
Divide the distance travelled by the time taken: speed = distance ÷ time. 150 km in 2 hours is 75 km/h. Choose "Speed" mode and enter distance and time.
How do I find travel time?+
Divide the distance by the speed: time = distance ÷ speed. 240 km at 80 km/h takes 3 hours. Make sure the speed and distance use the same distance unit.
What units does this use?+
Any consistent set: km and hours give km/h, miles and hours give mph, metres and seconds give m/s. The tool doesn’t assume a unit — you keep them consistent.
How do I handle minutes?+
Convert to the time unit that matches your speed. For km/h, a 45-minute trip is 45 ÷ 60 = 0.75 hours. Entering 45 instead of 0.75 gives a wildly wrong speed.
Is this average or instantaneous speed?+
It is the average speed over the whole trip: total distance ÷ total time. Instantaneous speed (what a speedometer reads) can be higher or lower at any given moment.