Data sources
Where our numbers come from
Every figure on this site shows its source and the date it was checked. These are the open datasets we build on, and the credit each licence asks for.
Typical driving distance by handicap, age and sex, offered as a starting point in the shot planner
- Licence
- © 2026 Arccos Golf. A published report; figures cited with attribution. No reuse licence is stated; permission not yet confirmed
- Credit
- Source: Arccos Annual Driving Distance Report, 2026 edition
Course outlines, maps, par, website and phone gaps (read via Overture Maps' base theme); hole lines, greens, tees and hazards for hole guides (read through the Overpass API)
- Licence
- Open Database Licence (ODbL)
- Credit
- © OpenStreetMap contributors
The street map behind course, town and county maps (its Positron style, drawn in the visitor's browser)
- Licence
- Free public map service with no keys or limits; map data © OpenStreetMap contributors (ODbL), map design © OpenMapTiles
- Credit
- OpenFreeMap © OpenMapTiles Data from OpenStreetMap
Flood warnings near courses, and rain measured in the last 72 hours (England)
- Licence
- Open Government Licence. Not for safety-critical use.
- Credit
- This uses Environment Agency flood and river level data from the real-time data API (Beta)
Forecasts for the playability score (Site Specific, Global Spot)
- Licence
- Weather DataHub terms
- Credit
- Contains Met Office data
Golf courses: names, locations, websites and phones
- Licence
- CDLA Permissive 2.0 (Meta, Microsoft) and Apache 2.0 (Foursquare)
- Credit
- © Overture Maps Foundation; includes data from Meta, Microsoft and Foursquare
Towns, their counties and populations (from OpenStreetMap)
- Licence
- ODbL (OpenStreetMap) and CC0 (Esri Community Maps)
- Credit
- © OpenStreetMap contributors, via Overture Maps Foundation
Trolley specs, prices and stock in the trolley finder (live from Evo's online shop); which golf balls are on sale in the UK, and shop-stated ball figures kept apart from the makers'
- Licence
- Connected business; used with permission
- Credit
- Prices and stock from Evolution Golf
Our compression estimates for balls whose maker gives no figure (ADR 0020): one figure per ball from each, linked beside it
- Licence
- Single figures cited with a link; no table copied. Neither site's terms forbid citing a figure (checked 5 Nov 2026)
- Credit
- Each estimate links to the charts it came from
Prices and stock for launch monitors, enclosures, mats, projectors, PCs and software in the golf simulator cost calculator, read live from its public product feed
- Licence
- Prices are facts from public product pages; no text copied. GolfBays is the spec's simulator affiliate (not yet joined)
- Credit
- Each part links to its GolfBays page
Prices for golf balls Evolution Golf doesn't sell (Affordable Golf, Callaway UK, Seed Golf UK, Costco UK), each with its page and the date checked
- Licence
- Prices are facts, read from public product pages that allow an ordinary read; no text copied
- Credit
- Each price names its shop and links to the page
Photos of balls Evolution Golf doesn't sell, in the golf ball compression chart (ADR 0021)
- Licence
- Makers' own images, used to identify the product, with the source page kept for each; removed on request
- Credit
- Images: Callaway, Cut Golf, Honma, Costco, Mizuno, Seed, Snell, Titleist, Vice, Volvik
Compression, cover, layers and swing speed ranges in the golf ball compression chart, each linked beside its ball
- Licence
- Facts only (figures and short descriptions in our words), each with its page and the date read
- Credit
- Each ball links to its maker's page
Green fees, read automatically from each club's own website and spot-checked by a person (each price links to its page)
- Licence
- Facts only: we store the price, the date and the page, never their text
- Credit
- Each price links to the page it came from
Handicap allowances for every format, and the count-back for ties, in the golf society calculator
- Licence
- Published rules; figures cited with a link. No text reproduced
- Credit
- Source: R&A, Rules of Handicapping Appendix C; Committee Procedures 5A(6)
Ceiling, width and depth each launch monitor needs, in the simulator room checker (Trackman, Foresight, Uneekor, Bushnell, SkyTrak, Garmin, Rapsodo, FlightScope, Full Swing)
- Licence
- Facts only: each figure is cited with a link to the maker's page. No text or images reproduced
- Credit
- Each figure links to the maker's page
Hand circumference and length for glove sizes 6 to 11, in the glove size calculator
- Licence
- Measurements from an international standard, cited as facts with the page they were read from
- Credit
- EN ISO 21420:2020 hand sizes, as published by Wenaas
Driver swing speed bands for each flex, shown side by side in the shaft flex calculator
- Licence
- Facts only: each guide's speed bands are cited with a link. No text reproduced
- Credit
- Each guide is named and linked beside its answer
Grip size from hand and finger length, in the grip size calculator
- Licence
- Facts only: the chart's sizes are cited with a link; its terms place no limit on citing it. No text reproduced
- Credit
- Grip sizes from the Grips4Less fitting chart
Change from standard club length by height and wrist-to-floor, in the club length calculator
- Licence
- Facts only: the chart's rows are cited with a link; its terms place no limit on citing it. No text reproduced
- Credit
- Club lengths from the Grips4Less chart, which credits Hireko's fitting guide