Observed arrival · 2026-11-14
Runjisu: running math with a doctor's perspective
A Korean-language running calculator turns a recent race time into training paces, distance predictions, and other tools for planning runs and races.
- For
- Korean-speaking recreational runners planning training or races
- Worth noticing
- It cautions that a marathon estimate based on a 10K can be too fast when long-distance training is lacking.
Field notes
The calculator accepts a recent result across standard race distances or a custom distance and returns a score, equivalent-distance estimates, and five pace bands. Its explanations distinguish easy, marathon, threshold, interval, and repetition work, with weekly-distance limits shown for some faster sessions. The site also links to tools for weekly schedules, race splits, shoe mileage, and injury information. It advises that a 10K-based marathon estimate may overstate readiness when long-distance training is insufficient.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue