Calculators

Useful numbers. Better decisions.

Indexable, explained endurance tools that connect pace, effort, time and fueling to the decision you actually need to make.

Tool roadmap

Running Pace & Split Calculator

Convert pace, speed and finish time, then build cumulative splits.

Coming first →

Race Time Predictor

Estimate equivalent 10K, half-marathon and marathon performances with appropriate limitations.

Planned →

Training Zone Calculator

Create usable running heart-rate and pace zones plus cycling power zones.

Planned →

Race Fueling Calculator

Build a time-based carbohydrate, fluid and gel schedule.

Planned →

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.