Speed Calculator
Find average speed from a distance and a time, shown in km/h, mph, and m/s.
Enter a distance and the time it took to see the average speed.
How to use the speed calculator
Enter the distance you covered and pick its unit, then type the time it took in hours, minutes, and seconds. The average speed appears at once, shown three ways: in km/h, in mph, and in m/s, so you can read whichever unit you need.
The result is average speed across the whole trip, not your top speed at any moment. To go the other way and find how far you travel at a set speed, use the distance calculator instead.
How average speed is worked out
Speed is distance divided by time. The tool converts your distance to meters and your time to seconds, divides one by the other, then converts the result into the units shown. So 100 kilometers in one hour is 100 km/h, which is about 62 mph and 27.8 m/s.
Because it uses total distance over total time, stops and slow patches are baked into the figure. That is what average speed means. If you want a per-kilometer or per-mile pace for running, the pace calculator is built for that.
Switching between speed units
The three units say the same thing in different scales. To go from m/s to km/h you multiply by 3.6, and a mile is 1.609 kilometers, so 60 mph is about 96.6 km/h. The tool shows all three at once so you never have to do the conversion by hand.
This is handy when a sign, a manual, or a fitness app uses a unit you are not used to. Read the figure you know and check it against the others. For converting a standalone speed value without a distance and time, the unit converter covers speed too.
Where a speed calculator helps
Cyclists and runners check their average pace over a route. Drivers work out how fast they were going on a leg of a trip. Students solve physics homework where distance and time are given and speed is the unknown.
It is also a quick sanity check for travel plans. Cover 240 kilometers in three hours and your average was 80 km/h. To estimate how long a trip will take at a given speed, pair this with the distance calculator.
Frequently asked questions
- How do I calculate average speed?
- Divide the distance by the time. Enter both here and the tool does it for you, showing the result in km/h, mph, and m/s. For example, 100 kilometers in 1 hour is 100 km/h.
- What units can I use?
- Distance can be in kilometers, miles, meters, feet, or yards, and time is entered in hours, minutes, and seconds. The speed result is always shown in km/h, mph, and m/s together.
- Is this average speed or top speed?
- It is average speed across the whole trip, found from total distance over total time. Any stops or slow sections are included, so it is lower than your peak speed.
- How do I convert m/s to km/h?
- Multiply meters per second by 3.6. So 10 m/s is 36 km/h. The tool shows km/h, mph, and m/s at once, so you do not need to convert by hand.
- What is the difference from a pace calculator?
- Speed is distance per unit of time, like km/h. Pace is the reverse, time per unit of distance, like minutes per kilometer. Runners usually prefer pace, so use the pace calculator for that.