Backswing-to-Downswing Ratio
Also known as: timing ratio, BS:DS ratio
Backswing-to-downswing ratio is the frame-counted timing of a swing's two halves. Video tools use it to track tempo objectively across sessions, not by feel.
"Swing tempo ratio" is the coaching concept: the idea that good tempo clusters near 3:1. The backswing-to-downswing ratio is the actual measured number behind it. It counts the video frames or milliseconds from takeaway to the top of the backswing. Then it divides that by the frames or milliseconds from the top to impact. This turns tempo from a felt sensation into a trackable data point. It can be logged, graphed, and compared across practice sessions, or even across holes within a single round.
The measurement depends on identifying precise moments: the takeaway start and the top-of-backswing transition, then the top and impact. So its accuracy is only as good as the video frame rate and the clarity of those transition points. A low frame rate video can genuinely misplace the top-of-backswing frame by a meaningful fraction of a second. That distorts the resulting ratio.
Tracked over time, this ratio is most valuable as a trend line rather than a single reading. Say a golfer's ratio drifts from session to session, or spikes noticeably under pressure. That golfer has objective evidence of where their swing timing is breaking down.
Example
A golfer logs their backswing-to-downswing ratio across ten range sessions and notices it creeps from 2.9:1 toward 2.2:1 whenever they are rushing — a pattern invisible without frame-by-frame timing data.
In SwingVantage Motion Lab
Motion Lab times this ratio from your hands: from the takeaway to the top, then from the top to impact, as estimates from pose. It gives no ratio when the clip starts after the takeaway or an event is unclear. The club starts back before the hands rise and reaches the top after them, so a count of the club can come out higher. To count your own ratio, step through a 60 fps clip from takeaway to the top, then from the top to impact.
Related terms
- Swing Tempo RatioSwing tempo ratio compares backswing time to downswing time, commonly near 3:1 for tour players. It is one of the simplest, most coached swing numbers.
- Frame Rate (Video Capture)Frame rate is how many images per second a video captures. It directly determines how precisely fast moments of a swing, especially impact, can be measured.
- Swing ConsistencySwing consistency measures how much tempo, plane, and impact position vary from swing to swing. Less variation generally goes with tighter shot dispersion.
- Baseline SwingA baseline swing is a reference swing recorded before you start work on a specific change. It is the fixed point every later retest is measured against.
Related guides & benchmarks
Put this into your swing
SwingVantage can spot this in your own swing — free to start.
See a sample Golf report first