Putting Green Speed (Stimpmeter)
Also known as: Stimp rating, green speed
Green speed is measured with a Stimpmeter and expressed in feet, commonly 8 to 13. It is how far a ball released from a standard ramp rolls on a level part of the green. Faster greens amplify break and demand a lighter stroke.
Green speed is measured with a Stimpmeter, a grooved metal ramp. It 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 7 to 9. Well-maintained private clubs often run 9 to 11, and championship setups can reach 12 to 14 or higher. Faster speeds come from closer mowing, rolling, and reduced moisture.
Green speed matters directly to two skills: distance control and break reading. A faster green needs meaningfully less swing length and force to cover the same distance. That is why golfers new to a course's green speed often run putts well past the hole for the first few holes before recalibrating. Speed also amplifies break. The same slope produces more visible curve on a fast green than on a slow one. The ball carries less forward momentum against gravity's pull across the slope, so the break has more time to act.
Green speed varies by course and by time of day. Morning greens are usually slower than afternoon greens as moisture evaporates and mowing effects wear off. On some courses it even varies hole to hole within one round. So most experienced golfers treat the first several holes' putts as calibration, reading speed as much as break. They do not assume 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 break. Calibrating to a 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. 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. The same slope produces more visible break at higher speeds.
Related terms
- Reading BreakReading break is predicting how much, and which way, a putt will curve based on slope. It is a separate skill from the putting stroke: a well-struck putt on a misread line still misses.
- Speed Control (Putting)Speed control is calibrating stroke length and tempo so a putt rolls the intended distance. It is widely considered the single most important putting skill.
- Lag PuttingLag putting is the deliberate strategy of putting distance control ahead of making a long putt. The aim is a short, stress-free second putt rather than an aggressive attack on the hole.
- Green ReadingGreen reading is judging a green's slope, grain, and speed. The goal is to predict how much, and which way, a putt will curve from its starting line.
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