Karvonen formula heart rate zones using resting HR and max HR for precise training targets.
Karvonen: target = ((maxHR − restingHR) × intensity%) + restingHR
Karvonen Heart Rate Calculator
Karvonen Heart Rate Calculator. HR zones using heart rate reserve. Fast, accurate, private.
Estimated max HR
190 bpm
Karvonen zones from 220 − age.
Zone 1 (recovery)125–138 bpm
Zone 2 (fat burn)138–151 bpm
Zone 3 (aerobic)151–164 bpm
Zone 4 (threshold)164–177 bpm
Zone 5 (max)177–190 bpm
Steps
- Open the calculator
- Enter your values
- Read the result instantly
Related
FAQ
Are results official?
No — quick estimates only. Confirm with your bank or provider.
Is data saved?
No. Calculations run in your browser.
Where is the full tool?
Each satellite links back to the main hub calculator.