Sprint Speed Calculator
Turn a sprint distance and time into speed in km/h, m/s and mph, plus your pace per 100 metres — for the 40-yard dash, 100 m and any short sprint.
How it works
speed = distance ÷ time · km/h = m/s × 3.6 · mph = m/s × 2.237 · pace/100 m = time ÷ distance × 100
Sprint speed is just distance over time, but the units matter: coaches quote m/s, track fans quote km/h, and US football scouts quote 40-yard times. This converts between all of them and adds a per-100 m pace for comparing efforts of different lengths. Note it is an average — you accelerate from a standstill, so your top-end speed in the middle of a 100 m is meaningfully faster than the average shown.
Worked example
100 m in 12.00 s: speed = 100 ÷ 12 = 8.33 m/s, which is 8.33 × 3.6 = 30.0 km/h and 8.33 × 2.237 = 18.6 mph. The pace per 100 m is 12.0 s. Elite men cover 100 m near 9.6 s, averaging about 37 km/h and peaking above 43.
Frequently asked questions
Is this my top speed?
No — it is average speed over the whole distance. A sprint starts from zero, so you spend the first 30–40 m accelerating. Peak speed in the middle of the run is often 10–20% faster than the average.
How do I compare a 40-yard dash to a 100 m?
Convert 40 yards to 36.6 m, enter that with your time, and read the m/s and per-100 m figures. The per-100 m pace lets you line up sprints of different lengths on the same scale.
Why convert to km/h and mph at all?
They make speed intuitive next to everyday references — 30 km/h is roughly urban traffic pace, and seeing a sprint in mph shows just how fast human running is over a short burst.
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Estimates for general fitness and education — individual results vary with terrain, fitness, technique and measurement error. Not medical advice.