Why this exists
Most pace calculators stop at a finish time. That leaves out a practical part of long races: time continues while a runner refills bottles, eats, changes clothing, finds a drop bag, or checks in with crew.
Aid Station Planner connects those pieces. It calculates the moving pace needed for a goal, or the finish produced by an expected pace, while showing how every planned stop changes later arrivals and departures.
What the calculator is—and is not
It is an independent planning utility. It is not a coaching service, medical tool, official race schedule, or performance guarantee. The site is not affiliated with a race organizer, UTMB, Garmin, Strava, or another endurance platform.
The calculation intentionally stays simple: one average moving pace, cumulative station distances, and explicit stop time. That makes the result easy to audit and easy to print. The tradeoff is that terrain, elevation, weather, fatigue, and race-day problems remain outside the model.
How information is handled
Race names, start times, pace, goal time, and station details are calculated in the browser. This version does not create accounts or save a plan to a server. The privacy page explains the current data and advertising posture.
How the site is maintained
Calculation behavior is covered by automated tests for both planning modes, unit conversion, stopped time, invalid station order, and overnight races. When calculation logic changes, the methodology and worked examples are updated with it.
The scope remains intentionally narrow. New features belong here only when they improve aid-station timing or the printed race-day card.