Explore heart-rate and fitness-testing calculators for training zones, aerobic capacity, thresholds, step and shuttle tests, fitness age, reactive strength, and heart-rate-based calorie estimates. The tools are grouped by the result they measure so related methods stay easy to compare.
Heart Rate & Zones
Calculate resting, maximum, reserve, target-zone, and post-exercise recovery heart-rate values.
Aerobic Capacity & Thresholds
Estimate VO2 max, lactate and anaerobic thresholds, MET intensity, and 20-meter shuttle-test performance.
Fitness & Performance Measures
Compare fitness index and fitness age results, reactive strength, and heart-rate-based calorie estimates.