Swing tempo calculator
Time your swing on video (frame count or stopwatch, in tenths of a second) and enter the two phases below. Tour average tempo is close to a 3:1 backswing:downswing ratio (source: published swing-tempo research, e.g. Tom Tomasello / trackable via most swing-analysis apps).
Swing history
Tempo research emphasizes consistency across swings, not a single good rep. Save each analyzed swing to track your ratio over time and see your real personal average.
No saved swings yet — analyze one above, then click "Save this swing".
Smash factor calculator
Smash factor is a real, standard club-fitting metric: ball speed divided by clubhead speed, a direct measure of strike efficiency (energy transfer at impact). Get both numbers from a launch monitor, swing-speed radar, or any app that reports them, then enter them below. Max efficient smash factor is limited by the physics of the collision (roughly 1.5 for a driver with modern COR rules) — higher isn't always better if it comes with a mis-hit launch angle, but it's a real, checkable number.
Smash factor history
Strike efficiency varies shot to shot more than swing tempo does. Save each analyzed shot to see your real average smash factor by club over time.
No saved shots yet — analyze one above, then click "Save this shot".
Spin loft calculator
Spin loft is a real, well-documented swing metric: the dynamic loft the clubface presents at impact, minus the club's angle of attack (negative for a descending strike, positive for an ascending one). It is a real driver of backspin and launch conditions, independent of tempo or smash factor. Get dynamic loft and angle of attack from a launch monitor or swing-analysis app, then enter them below. The ranges below are commonly cited in club-fitting/instruction content as general guidance, not a precise measurement this page itself performs.
Spin loft history
Spin loft varies more swing-to-swing than tempo does, especially with angle of attack. Save each analyzed swing to see your real average over time.
No saved swings yet — analyze one above, then click "Save this swing".
What's real here, what isn't yet
All three calculators above run entirely in your browser and give real, correct calculations — no fake numbers. Saved history (tempo, smash factor, and spin loft, separately) is stored only in this browser's local storage: no account, no server, nothing synced across devices, and "Clear saved history" really deletes it (there is no copy anywhere else). These are three narrow slices of the full "biomechanics analysis and computer-aided training" product named in this venture's spec, not the whole thing: full swing-plane video analysis, joint-angle tracking, and a coached training program are not built yet — those require pose-estimation input this account does not currently have wired up, so they aren't described as if they exist. This page will be extended as those pieces become real.