Heart Rate Reserve (Karvonen) Calculator
Calculate your heart rate reserve and target training zones using the Karvonen formula for precise exercise intensity planning.
Max Heart Rate
190 bpm
Heart Rate Reserve
125 bpm
Target HR at 50%
128 bpm
Target HR at 60%
140 bpm
Target HR at 70%
153 bpm
Target HR at 80%
165 bpm
Target HR at 90%
178 bpm