Understanding Green Speed (Stimpmeter)
A Stimpmeter is a 36-inch aluminum ramp. A golf ball is released from a notch and rolls across the green. The distance it rolls (in feet) is the Stimpmeter reading.
| Stimpmeter | Speed | Typical Venue |
|---|---|---|
| 6–7 | Slow | Municipal courses, after rain |
| 8–9 | Average | Standard public courses |
| 10–11 | Fast | Well-maintained private clubs |
| 12–13 | Very Fast | PGA Tour events |
| 13–14+ | Major Championship | Augusta National, US Open venues |
Augusta National during The Masters typically runs at 13.0–14.0 on the Stimpmeter. US Open venues run 12.5–13.5. Your local muni is probably 7–9.
How to Read Break
Walk to the low side of the putt and look at the slope. The ball will always break toward the lowest point. Crouch behind the ball and behind the hole for two perspectives.
A 2-degree slope on a 20-foot putt breaks roughly 10–14 inches on average-speed greens. On fast greens (12+ Stimpmeter), that same putt breaks 16–20+ inches.
Speed vs Break Relationship
Faster greens = more break. If you hit the putt hard (die it 3 feet past), the ball takes less break because it's moving faster. If you lag it to die at the hole, it takes the maximum break.
Tour players aim to have a putt die 12–18 inches past the hole. This gives the best chance of falling in — firm enough to hold the line but soft enough to catch the lip.
How to Use This Green Speed Calculator
- Enter the distance to the hole in feet. Pace it off on the green — each pace is roughly 2.5 feet.
- Estimate the slope in degrees. Flat = 0, slight tilt = 1, moderate = 2-3, severe = 4+. If unsure, stand behind your ball and judge visually.
- Select the green speed. Public courses run 7-9 on the Stimpmeter. Private clubs 10-11. Tournament greens 12+.
- Choose putt direction. Uphill, level/sidehill, or downhill. This affects how hard to hit the putt.
- Click "Calculate." The tool shows break amount, aim point (in cup widths), effective distance, and a putting tip.
Benefits of Calculating Break
Read greens with confidence. Most amateur golfers underread break by 30-50%. This calculator shows you the actual break amount, which is almost always more than you think.
Save strokes on the green. Putting accounts for 40% of your total strokes. Reading break accurately drops your putts-per-round by 2-4, which directly lowers your handicap.
Better speed control. Knowing the effective distance (adjusted for uphill/downhill) helps you calibrate your stroke. A 20-foot uphill putt might play like 25 feet. A downhill one might play like 15.
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