Putting Green Speed (Stimpmeter)
Also known as: Stimp rating, green speed
Green speed, measured with a Stimpmeter and expressed in feet (commonly 8 to 13), tells how far a ball released from a standard ramp rolls on a level part of the green. This means faster greens amplify break and demand lighter stroke speed.
Green speed is measured with a Stimpmeter, a grooved metal ramp that releases a golf ball at a standard, repeatable speed onto a flat section of green. The distance the ball rolls in feet is the green's Stimp rating. Everyday public course greens commonly run in the 7 to 9 range, well-maintained private clubs often run 9 to 11, and championship tournament setups can reach 12 to 14 or higher, with faster speeds achieved through closer mowing height, rolling, and reduced moisture.
Green speed matters directly to two skills: distance control and break reading. A faster green requires meaningfully less swing length and force to cover the same distance. This is why golfers who are unfamiliar with a course's green speed frequently blow putts well past the hole on their first few holes before recalibrating. Speed also amplifies break. This means the same slope produces more visible curve on a fast green than on a slow one. This is. This is because the ball is traveling with less forward momentum relative to the pull of gravity across the slope. This gives the break more time and opportunity to act on the ball's path.
Because green speed varies by course, by time of day (morning greens are typically slower than afternoon greens as moisture evaporates and mowing effects wear off), and even hole to hole within one round on some courses, most experienced golfers treat the first several holes' worth of putts as calibration opportunities. This means deliberately reading speed as much as break. Instead of assuming a speed carried over from a previous round or a different course.
Example
A player used to a home course running 9 on the Stimpmeter plays a tournament on 12-foot greens and blows their first three putts well past the hole before adjusting their feel for the faster speed.
Why it matters
Green speed changes both how hard to hit a putt and how much a given slope will actually break. This is why calibrating to a specific green's speed early in a round prevents repeated distance-control errors.
Common mistakes
- Assuming green speed carries over from a previous round or a different course without recalibrating on the practice green first.
- Under-reading break on fast greens, where the same slope produces meaningfully more curve than on a slower green.
- Not accounting for green speed changing over the course of a day as moisture and mowing effects change.
Frequently asked questions
What does a Stimpmeter measure?
It measures how far, in feet, a golf ball rolls when released at a standard speed down a grooved ramp onto a flat section of green. This means that distance is the green's speed rating.
Why do faster greens break more?
The ball travels with less relative forward momentum on a fast green. This gives gravity and slope more time and opportunity to curve its path. This means the same slope produces more visible break at higher speeds.
Related terms
- Reading BreakReading break is predicting how much and which direction a putt will curve based on slope. It is a distinct skill from executing the putting stroke. This means a well-struck putt on a misread line still misses.
- Speed Control (Putting)Speed control is calibrating stroke length and tempo. As a result, the ball travels the intended distance. This means widely considered the single most important putting skill, since a well-read putt at the wrong speed still misses and often leads to a three-putt.
- Lag PuttingLag putting is the deliberate strategy of prioritizing distance control over making a long putt, aiming to leave a short, stress-free second putt rather than attacking the hole aggressively.
- Green ReadingGreen reading is assessing the slope, grain, and speed of a putting surface to predict how much and which way the ball will curve from its starting line to the hole.
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