Predict pace for every distance
from a single result
Enter one recent race and get target pace, split plans, and training targets in seconds. Use the numbers right away instead of building your own spreadsheet.
Core tools
Start here for the calculators you will use most often.
๐ Race Time Predictor
Project 5K to marathon goals and split pacing from one recent race result.
Calculator๐ Heart-Rate Zones
Calculate Zone 1-5, MAF, and Karvonen outputs in one screen.
Converter๐งฎ Treadmill Pace
Convert speed and pace instantly, including 400m split references.
Calculator๐ฅ Lactate Threshold
Map LT pace/HR to practical tempo and cruise workout intensity.
More running resources
Use these pages to turn numbers into training decisions.
๐ About
See the product direction, update policy, and how each tool is designed.
๐ Running Guides
Use practical playbooks for Zone 2, tempo, intervals, fueling, and recovery.
๐๏ธ Gear Guide
Compare shoes, wearables, and fueling items by purpose and level.
๐๏ธ Marathon Schedule
Check major race dates and registration timing for Korea and global events.
Start with the tools you will use most
Begin with race prediction, then layer in HR zones and LT to lock in your training intensity.