Find your maximum heart rate and training zones
Your maximum heart rate (MHR) is the highest number of beats per minute your heart can reach during all-out effort, and it sets the boundaries for your training zones. This calculator estimates MHR using four research-backed formulas — Tanaka, Haskell & Fox, Gulati and Nes — and breaks the result into five zones from easy recovery to maximum effort.
Enter a resting heart rate and the zones switch to the Karvonen heart-rate-reserve method for a more personalised result. Everything runs in your browser, so nothing is uploaded. Age-based estimates carry a typical error of around ten beats per minute, so treat them as a guide.