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Sprint Speed Calculator

Enter distance and time to get your speed instantly.

How it is calculated

Average speed is the distance divided by the time taken. The result in metres per second is then converted to the other two units.

v = d ÷ t, km/h = v × 3.6, mph = v × 2.2369

d is the distance in metres and t is the time in seconds, so enter 100 for a 100 m dash and use seconds with decimals (11.5), not minutes. Distance and time must both be greater than zero, otherwise there is no result. All three speeds are shown to 2 decimals. This is the average over the whole run, including the start from a standstill, so it is lower than the top speed reached mid-race.

Worked example

A 100 m sprint is run in 11.5 s. Speed in metres per second: 100 ÷ 11.5 ≈ 8.6957, shown as 8.70 m/s. Convert to km/h: 8.6957 × 3.6 ≈ 31.30. Convert to mph: 8.6957 × 2.2369 ≈ 19.45. So the average speed is 8.70 m/s, 31.30 km/h or 19.45 mph.

Try this example →

Common mistakes

  • Entering the distance in yards or feet. The tool assumes metres, so a 40-yard dash must be entered as about 36.58 m.
  • Typing the time as minutes and seconds, such as 1.15 for 1 min 15 s. Use total seconds, 75.
  • Comparing an average with a peak figure. The average includes the acceleration phase, so it is always lower than top speed.
  • Rounding the time before entering it. A 0.1 s difference over 100 m changes the speed by about 0.07 m/s.
  • Using a hand-timed result and an electronic one interchangeably. Hand timing usually reads faster, so the same run gives a different speed.

About this calculator

Sprint speed is simply distance divided by time, but converting a raw split time into a comparable speed figure — meters per second, kilometers per hour, or miles per hour — is what makes a stopwatch reading useful for comparison. Elite male sprinters average around 10 to 10.5 m/s over 100 meters, with peak instantaneous speed reaching roughly 12 to 12.4 m/s (Usain Bolt's world-record run hit an estimated 12.4 m/s at its fastest point), which gives a frame of reference for interpreting a measured time.

Track and field coaches use average sprint speed calculated this way to compare athletes across different distances, strength and conditioning coaches use it to benchmark a 40-yard dash or flying-sprint test, and sports scientists use it as one input into broader speed and acceleration profiling.

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