Analyze marathon course elevation with a GPX file. View elevation profile, total climb, grade %, and identify the key hills that affect pacing.
Course elevation should inform pacing and fueling. Upload a GPX to find the climbs that will matter most on race day.
Every page on this site has a Markdown mirror at the same path with a .md suffix (for example /calculator.md), and honors an Accept: text/markdown request header on the HTML URL. The calculations here are also available as callable tools through a free public MCP server — no account or API key.