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Tennis Serve Speed (mph) from Distance and Time Calculator

speed_mph = (distance_ft / time_s) · 0.6818.

Compute the speed of a tennis serve from the (foot-traced) distance the ball travels between leaving the racquet and crossing the receiver's baseline and the elapsed time, captured by a high-speed video or radar timer. mph = ft/s × 0.6818. Reports mph, km/h, and the proper m/s value.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

ft
s

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

mph = (ft / s) × 0.6818.

In depth

Compute the speed of a tennis serve from the (foot-traced) distance the ball travels between leaving the racquet and crossing the receiver's baseline and the elapsed time, captured by a high-speed video or radar timer. mph = ft/s × 0.6818. Reports mph, km/h, and the proper m/s value.