Zone2CalHow do I calculate marathon goal pace?
Enter a recent race result and target distance. Zone2Cal estimates finish time with the Riegel model, then converts that result into average pace and split targets.
Science-backed running tools
Predict pace for every distance
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.
Open the right calculator by goal
Start with the question you need answered, then move from race pace to heart rate and training intensity.
Calculator
🏁 Race Time Predictor
Project 5K to marathon goals, average pace, and split pacing from one recent race result.
Answers: predicted time · goal pace · split plan Calculator💓 Heart-Rate Zones
Calculate Zone 1-5, Zone 2, MAF, and Karvonen outputs from age and resting HR.
Answers: Zone 2 bpm · max HR · training zones Converter🧮 Treadmill Pace
Convert speed and pace instantly, including 400m split references.
Answers: km/h · mph · min/km · min/mile Calculator🔥 Lactate Threshold
Map LT pace/HR to practical tempo and cruise workout intensity.
Answers: LT pace · LT heart rate · tempo range
AEO Quick Answers
Direct answers for common running questions
What should I use for Zone 2 heart rate?
Use 60-70% of max heart rate as a baseline, or use Karvonen when you know resting heart rate and want a more personalized range.
How do treadmill speed and outdoor pace match?
Convert km/h or mph into min/km and min/mile, then compare the result with your target workout pace and 400m split reference.
More running resources
Use these pages to turn numbers into training decisions.
📌 About
See the product direction, update policy, and how each tool is designed.
📚 Running Guides
Use practical playbooks for Zone 2, tempo, intervals, fueling, and recovery.
🛍️ Gear Guide
Compare shoes, wearables, and fueling items by purpose and level.
🗓️ 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.