Calculate speed, distance or travel time, with results in km/h, mph, m/s, knots and running pace.
Speed = distance ÷ time. Running 10 km in 50 minutes is 12 km/h (7.46 mph), a pace of 5:00 per km. Rearranged, distance = speed × time and time = distance ÷ speed.
The Speed Calculator solves the classic speed–distance–time triangle. Choose what you want to find and enter the other two. The result is shown as speed in km/h, mph, m/s, knots and ft/s; as distance in kilometres and miles; as time in hours, minutes and seconds; and as running pace per kilometre and per mile.
Use it for planning journeys, checking an average speed, working out a run or cycle pace, or converting between speed units. For converting speed units alone see the Units Conversion Calculator; for car trips see the Mileage Calculator.
All inputs are converted to metres and seconds, solved, and converted back.
| Question | Answer |
|---|---|
| 10 km in 50 minutes | 12 km/h · pace 5:00 /km |
| 100 km at 60 km/h — time | 1:40:00 |
| 100 mph for 2 h 30 min — distance | 402.336 km |
| Marathon (42.195 km) in 4 hours | 10.5488 km/h · pace 5:41 /km |
| 100 m in 10 seconds | 36 km/h |
| Pace (min/km) | Speed (km/h) | Pace (min/mile) | 5 km time | 10 km time |
|---|---|---|---|---|
| 4:00 | 15.00 | 6:26 | 20:00 | 40:00 |
| 5:00 | 12.00 | 8:03 | 25:00 | 50:00 |
| 6:00 | 10.00 | 9:39 | 30:00 | 1:00:00 |
| 7:00 | 8.57 | 11:16 | 35:00 | 1:10:00 |
| 8:00 | 7.50 | 12:52 | 40:00 | 1:20:00 |
| 9:00 | 6.67 | 14:29 | 45:00 | 1:30:00 |
| 10:00 | 6.00 | 16:06 | 50:00 | 1:40:00 |
Average speed is total distance divided by total time — not the average of two speeds. Driving 60 km at 30 km/h and then 60 km at 60 km/h takes 3 hours for 120 km, an average of 40 km/h, not 45.
Divide distance by time. 10 km in 50 minutes (0.833 hours) is 12 km/h.
Multiply speed by time. At 100 mph for 2.5 hours you cover 250 miles.
Divide distance by speed. 100 km at 60 km/h takes 1 hour 40 minutes.
Multiply km/h by 0.621371. 100 km/h is 62.1 mph.
Multiply by 3.6. 10 m/s is 36 km/h.
The time needed to cover a kilometre or mile, written as minutes:seconds. A 5:00 per km pace is 12 km/h.
One nautical mile per hour, about 1.852 km/h or 1.151 mph, used at sea and in aviation.
Divide the total distance by the total time, including stops if you want your overall average.
Yes — use the three time boxes; any can be left blank.
No. Everything runs in your browser.
