How a course is measured here
Nothing on a course page is typed in by hand. Each one is computed from the geometry that OpenStreetMap contributors have drawn for that course, so the same formula produces every figure on all 13,416 courses, and anyone can check it against the map.
The source
OpenStreetMap tags a course boundary as leisure=golf_course and, where someone has taken the time, each fairway, green, tee box, bunker, water hazard and the line of each hole from tee to green, with that hole's number, par and stroke index. The extract used here is from October 15, 2026. Of the 13,416 US courses with a boundary, 7,938 have at least nine numbered holes drawn and most of their greens; those are the ones called mapped hole by hole. The rest show the property outline, elevation and nearby courses only, and their pages are kept out of search engines until the holes exist.
The data is © OpenStreetMap contributors under the ODbL. If a course is wrong or missing, the fix belongs on OpenStreetMap, where it helps every map; this site picks the change up at its next refresh.
Length
Measured yardage is the geodesic length of the line drawn for each hole, usually from a tee box to the middle of the green. Mappers tend to start the line at a middle tee rather than the tips, so a course measures a little shorter than its card from the back tees. When a mapper has recorded the card yardages per tee color, those appear as separate columns.
Bunkers and water
A hole's bunker count is the number of mapped bunkers within 50 yards of its line. The course total counts every bunker on the property. Water is “in play” on a hole when a pond, lake, stream or mapped hazard comes within 40 yards of the line. Sand and water acreages are the areas of those polygons. A course whose mapper drew only the big bunkers will undercount; compare bunker figures with that in mind.
Elevation
Elevation is sampled every 15 meters along each hole from USGS 3DEP terrain (about 10 m resolution, via AWS Terrain Tiles). Rise is the green's elevation minus the tee's. Climb is the sum of every uphill step along the line after light smoothing, so a hole that dips and rises counts both rises; the course total adds the holes together. The profile under a hole is that same sample.
Dogleg, fairway width, greens
The dogleg angle is the turn at the point where the hole line is farthest from a straight tee-to-green chord, reported when it exceeds 15 degrees. Fairway width is the fairway polygon's area divided by the length of hole line running through it, an average rather than the width at any one landing zone. Green size is the area of the green polygon nearest the end of the hole line.
Green to next tee
The straight-line distance from each green to the next hole's tee, added up. It is a rough guide to how far a walker goes between holes, not a path measurement.
Towns
A course is listed under the Census-designated place its center falls in. One outside any place boundary is listed as “near” the closest place within 15 miles.
What is not here, and why
- Course rating and slope are published by golf associations under license and not in any open dataset.
- Green fees change weekly and by season; a copied price is wrong within a month. The course website is linked when the map records one.
- Conditions and reviews are opinions this site has no way to verify. Nothing here is a ranking.
- Public or private is shown only when the map says so (an access tag, or a city or county as operator). A blank means the map doesn't say, not that the course is public.
Found an error in a figure rather than on the map? Say so here.