The data-driven golfer's putting calculator.
Enter stimp, distance, slope, and grain. Get a target ball speed and a recommended backstroke length, calculated from the same physics a launch monitor measures. Built for golfers who already measure things, and for golfers who want to start.
What it does
- calculator Target ball speed from stimp, distance, slope, and grain — multi-segment putts supported.
- backstroke Recommended backstroke length from your saved smash factor and stroke tempo.
- stimp Per-round stimp calibration from a few rolled putts, with a chart of your data points against the fitted curve.
- tempo Metronome with named cadences. Train a consistent stroke time on the practice green.
- drills Snowman drill: 12 clock positions, your safe-zone shape on every slope you practice.
- stats Make rate by distance bucket, with PGA Tour comparison from Mark Broadie's published tables.
Who it's for
Golfers who like numbers. If you've ever used a launch monitor on putts, tracked strokes-gained, or wondered why your feel-based practice isn't getting feedback — this is the tool.
The calculator is offline-first. It works in the bottom of your bag with no signal, on the practice green at sunrise, and on a course your phone has never seen. Logging, calibration, and history sync to your account when you have a connection.
Status
v1.0 is on the App Store today as Golden Hour Putting Calculator. v2 is in active development and adds putt logging, stimp calibration, the Snowman drill, tempo training, and Sign in with Apple. v2 ships under the same app entry on the App Store — existing users get an update.