Route difficulty calculator. Upload a GPX to break down grade, climbs, and hard segments so you can plan pacing for hilly courses.
Difficulty is more than distance. Hills change effort, pacing, and fueling. Use grade breakdowns to plan where to stay conservative.
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.