Trail running elevation analysis. Upload a GPX to see climbs, descents, grades, and where the toughest sections land on the route.
On trails, pacing swings more with terrain. Use grade and climb placement to plan effort and fueling.
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.