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Run the numbers. Then run easy.
Split tables, a gel planner, a race predictor and the World Marathon Majors. Built for a phone at the start line, with every formula written out underneath.
Example: a 3:30 marathon- finish
- 3:30:00finish
- per km
- 4:59/km
- per mile
- 8:01/mi
- km/h
- 12.1km/h · 7.5 mph
Tools
- Pace tableGoal time in, split table out. Even or negative, km or miles, printable pace band.
- Pace convertermin/km, min/mile, km/h and mph, with finish times for the big four distances.
- Nutrition plannerCarbs per hour in, gel count and a timed schedule out. Fluid and sodium ranges included.
- Race predictorA recent race result in, predictions for other distances out, with the caveats spelled out.
The Majors
Tokyo, Boston, London, Sydney, Berlin, Chicago and New York: course profiles, dates and how to get a bib.
How the numbers work
Formulas on the page
Each tool explains what it calculates and where the method stops being reliable. No black boxes.
A source for every spec
Shoe and race facts link to where they came from. If a value can't be verified, it says so instead of guessing.
Your data stays yours
No accounts, and analytics only if you agree. Results live in the page link, so sharing a plan means sharing a URL.