Running Tools
Free calculators for runners — race performance, training zones, and route analysis.
VDOT Calculator
Jack Daniels' VDOT — predict equivalent race times and training paces from any race performance.
McMillan Calculator
McMillan Running — equivalent race times and training paces from 800m to marathon.
Tinman Calculator
Critical Velocity method — CV pace, equivalent races, and training paces.
Humphrey Calculator
Hansons/Humphrey method — race equivalencies and training paces.
80/20 Calculator
Matt Fitzgerald's 80/20 Running — pace zones and heart rate zones.
Friel Calculator
Joe Friel's training zones — HR, power, and pace from your lactate threshold.
KM-Effort Calculator
Elevation-adjusted distance — account for vert in your run effort calculation.
GPX Elevation Analyzer
Upload a GPX file for per-kilometer elevation gain, loss, and grade analysis with map.