Average speed from distance and time
MPH Calculator
Give it a distance and a time and it returns average speed in miles per hour, kilometres per hour, metres per second and feet per second. It is preset to a quarter-mile run in 12 seconds.
- Feet per second
- 110.0 ft/s
- Meters per second
- 33.53 m/s
- Knots
- 65.2 kn
- Pace
- 0.80 min/mile
The formula
speed = distance ÷ time. A quarter mile (1,320 ft) in 12 seconds is 110 ft/s, or 75 mph on average. Your trap speed is far higher (about 114 mph at 12 s) because you are accelerating the whole way, so the finish speed is roughly 1.5 times the average.
Average speed over a quarter mile
| Quarter-mile ET | Average speed (mph) | Typical trap speed (mph) |
|---|---|---|
| 16.00 s | 56.3 | 85.2 |
| 14.00 s | 64.3 | 97.4 |
| 12.00 s | 75.0 | 113.6 |
| 10.00 s | 90.0 | 136.3 |
| 9.00 s | 100.0 | 151.5 |
| 8.00 s | 112.5 | 170.4 |
Speed unit conversions
| From | To | Multiply by |
|---|---|---|
| mph | km/h | 1.6093 |
| mph | ft/s | 1.4667 |
| mph | m/s | 0.4470 |
| km/h | mph | 0.6214 |
Frequently asked questions
How do I calculate mph from distance and time?
Convert the distance to miles and the time to hours, then divide. Or put the numbers in the calculator.
Why is my trap speed higher than my average speed?
Trap speed is your speed at the finish. The average speed over the run is lower because you started from a standstill.
How many feet per second is 60 mph?
Exactly 88 feet per second.
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