Calculate greens-in-regulation percentage, normalize a mixed sample to 18 holes, or find the greens needed for a target.
How the Greens In Regulation Calculator Works
GIR percentage divides the number of greens reached in regulation by the holes played. The target-greens mode rounds up to a whole green so the target is met. The equivalent-holes inverse can be fractional and does not represent a playable hole count.
Formula: GIR% = greens hit / holes played x 100; required greens = ceiling(holes x target percentage / 100)
Choosing the Right Inputs
Count a green when the ball is on the putting surface in one stroke on a par 3, two or fewer on a par 4, or three or fewer on a par 5. Use whole counts from one round or a combined sample of up to10,000 holes, without assuming every record contains18 holes. Combine counts before computing the rate.
| Hole par | Maximum strokes to reach green | Reason |
|---|---|---|
| Par 3 | 1 | Two putts remain for par |
| Par 4 | 2 | Two putts remain for par |
| Par 5 | 3 | Two putts remain for par |
Understanding Your Results
GIR percentage leads, followed by hit and miss counts, a normalized GIR-per-18 value, and holes per GIR. Target mode also shows the actual rate produced by the rounded whole-green requirement.
Worked Example
Nine greens in 18 holes is 50.0%, nine misses, 9.0 GIR per 18, and one GIR every two holes. A 55% target over 72 holes requires 40 greens, which produces 55.6%.
Assumptions and Limitations
GIR describes approach outcomes, not proximity, hole difficulty, weather, or putting performance. Partial-round and multi-course samples remain mathematically valid but may not be directly comparable.
Sources
PGA TOUR. Greens in Regulation Percentage, Stat 103.
