Free Tools

Training Tools & Calculators

Fast, private tools that run entirely in your browser — nothing you type is uploaded. Pick one to get started.

Running Pace Calculator

Solve pace, time, or distance — in min/km and min/mile.

 Race Time Predictor

Estimate another distance from one race, via the Riegel formula.

 Heart Rate Zone Calculator

Your five training zones from age and resting heart rate.