Health tool map
Exercise & fitness
Training, performance, heart-rate, and activity estimates.
Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.
Heart Rate Reserve Zone Calculator
Calculate a user-selected heart-rate-reserve percentage band from age, resting heart rate, and either entered or estimated maximum heart rate.
One Rep Max Calculator
Estimate one-repetition maximum with Epley, Brzycki, and Lombardi formulas from a completed set in pounds or kilograms.