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Marathon Time Predictor & Pace Planner

Estimate your marathon finish time with pace decay or plan your race with split times every 5 km.

※ Use if necessary

Marathon Time Predictor & Pace Planner

Choose a mode to predict your marathon finish time or plan your race with split times every 5 km.

Calculation Mode

Distance Unit

Distance Covered (km or miles)

Runner Level

Elapsed Time (Hours)

Elapsed Time (Minutes)

Elapsed Time (Seconds)

Marathon Distance

This calculation is an estimate and does not account for variables such as terrain or weather. Results are for reference only and were created for educational and testing purposes.

Calculation Results

Estimated Finish Time 0h 0m 0s

Marathon Time Predictor & Pace Planner Guide

Estimate your marathon finish time with pace decay or plan your race with split times every 5 km.

How to Use the Calculator

Select a mode and follow the steps below:

Predict Finish Time Mode

Enter Distance Covered.
Select Distance Unit (km or miles).
Select Runner Level (Beginner: 25%, Intermediate: 12%, Elite: 3% decay).
Enter Elapsed Time.
Select Marathon Distance or enter a custom distance.
Click "Calculate".

Target Pace Planner Mode

Enter Target Finish Time.
Select Distance Unit.
Select Marathon Distance or enter a custom distance.
Click "Calculate".

Understanding Marathon Distances

Full Marathon

42.195 km (26.2 miles).

Half Marathon

21.0975 km (13.1 miles).

Custom Distance

Input any distance for personalized predictions.

Pace Calculation Methods

Predict Finish Time Mode

Uses current pace with decay (25%, 12%, or 3%).

Target Pace Planner Mode

Calculates uniform paces for target time.

Factors Affecting Performance

Fatigue, terrain, and weather can impact times.