Tool roadmap
Running Pace & Split Calculator
Convert pace, speed and finish time, then build cumulative splits.
Race Time Predictor
Estimate equivalent 10K, half-marathon and marathon performances with appropriate limitations.
Training Zone Calculator
Create usable running heart-rate and pace zones plus cycling power zones.
More than a widget
Each calculator will explain what the result means, which assumptions it uses, when it becomes unreliable and how to apply it safely. The first tool in production is the Running Pace & Split Calculator.