How it works

Historical information about who enters, starts and finishes each race. We record women's and men's counts separately at each stage, and where possible per distance, so a 100km field is never hidden inside a 10km one.

Every data point carries its source. We never present an estimate as official event data.

• Official event data — Published by the event or its timing provider.
• Organiser supplied — Provided directly to us by the race organiser.
• Public results data — Derived from publicly available results listings.
• Estimated from available data — Inferred where fields are incomplete. Never presented as official.

Information provided by race organisers and by women who have participated: facilities, safety provisions, policies and how the event actually felt. Organiser-supplied information can be marked verified once we have confirmed it.

The runner rating is simply the average of the overall star ratings left by women who ran that specific race, in that specific year. Nothing is weighted, adjusted or blended across distances or across years.

We always show the number of reviews next to the rating, so you can judge for yourself how much to read into it. Where a race has no reviews yet we say so rather than inventing a number.

Where results are published we summarise women's finishing times for each race — typically the median, along with the spread from quicker to slower finishers. The median is a description of what happened last time, not a prediction of your race.

Every checklist item is recorded in one of four public states:

• Available — the race provides it.
• Not available — the race does not provide it.
• Conditional — provided in some circumstances, with the conditions shown.
• Unknown — we have not been able to confirm it, either publicly or with the organiser. That is a gap in information, not a mark against the race.

A status may be confirmed from published information or directly with the organiser; both are recorded the same way.

A single number out of 100 hides more than it reveals, and can look like a verdict when the underlying information is thin. Instead we show the facts side by side and let you weigh what matters to you.

Plenty of events already do excellent work and simply have not published it. Others are one policy away from a meaningfully better experience. Our aim is transparency and constructive improvement — showing organisers exactly which categories are moving, and giving runners the context to choose well.

Organisers can supply or correct information at any time, and verified information is labelled as such.