Training calculators
Choose what you want to calculate. Every tool works without an account, and your inputs are processed only in your browser.
HRmax calculator
Estimate your maximum heart rate with three formulas: Tanaka, Fox and Gellish. See how the results differ and when a real test is worth doing.
Open calculator →Heart rate zones calculator
Get heart rate zones using the best method your data allows: LTHR, Karvonen or percentage of HRmax. The calculator picks the method and tells you how confident it is.
Open calculator →Karvonen calculator
Calculate target heart rate using heart rate reserve. More accurate than a plain percentage of HRmax because it accounts for your resting heart rate.
Open calculator →e1RM calculator
Estimate your one-rep max from a safe working set. Three formulas, a confidence rating and ready percentage-based loads.
Open calculator →FTP power zones calculator
Convert your FTP into seven Coggan power zones. See the exact watts for endurance, tempo, threshold and VO2max work.
Open calculator →TSS calculator
Calculate the Training Stress Score of a ride from duration, normalized power and FTP. One number for the session load.
Open calculator →Running pace calculator
See how your pace compares to threshold pace, what load the session generates and what your critical speed is.
Open calculator →CSS swimming calculator
Determine your critical swim speed from a 400 m and 200 m test. You get threshold pace per 100 m and ready-made swim zones.
Open calculator →Results are informational. Estimates do not replace a measurement or individual consultation.