AgeCalc Pro
Age and body-metric calculators in the browser
PaceCalc Pro offers calculators for pace, marathon pacing, VDOT, VO2 max, 5K splits, treadmill conversion, and race-time prediction. It supports runners and coaches planning training or race day strategy.
Runners and coaches.
PaceCalc Pro is an independent website. Tools Lib lists it; features and pricing are set by its makers and can change.