Endurance Calculators

Endurance Calculators is a free toolkit for endurance athletes covering running, cycling, and swimming. RUNNING • Pace converter (min/mile ↔ min/km) • Race finish time predictor • VDOT training zones • Altitude pace adjustment CYCLING • Power & HR training zones • Watts per kilogram calculator • Altitude power adjustment • Distance & speed converter SWIMMING • Pace converter (per 100m / 100yd) • Pool course conversion (SCY, SCM, LCM) Built for athletes who want quick answers without the math. Works offline.