endurance performance tool
Race Time Predictor
Predict your race times for 10K, Half, or Full Marathon based on a recent running distance.
Interactive Calculator System
5
22
10 180
21.1
Real-time Calculated Outputs
Predicted Target Duration
1
Predicted Pace Target4:48 min/km
Based on your recent baseline performance, your predicted target time is 1h 41m 13s at an average velocity of 4:48 min/km.
Methodology & Formula: Riegel Performance Formula
Predicted Time (T2) = Recent Time (T1) × (Target Distance [D2] ÷ Recent Distance [D1])^1.06.
Standard Reference Calculations
Predicting Marathon from 20-min 5K
Inputs: Distance: 5K, Time: 20 mins, Target: Marathon
Output: Predicted: 3:11:51
Frequently Asked Questions
Get answers to common queries based on clinical literature and fitness research.
Highly reliable, provided your endurance volume and training correspond to the target distance. Do not attempt a predicted marathon without building a high-volume aerobic base!