Health & Fitness
Karvonen Heart Rate Calculator
Calculate training heart rate zones using the Karvonen method.
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
Frequently asked questions
What is the Karvonen formula?
A more accurate heart rate zone calculation that accounts for resting heart rate (heart rate reserve).
Why use resting HR?
It personalizes zones to your fitness level. Fitter people have lower resting HR.
How do I find my resting HR?
Measure first thing in the morning, lying still, for several days and average.
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About this tool
This Karvonen Heart Rate Calculator turns your inputs into practical results. Provide Resting Heart Rate, Max Heart Rate (optional), and Age to calculate Zone 1 (Recovery) and Zone 2 (Aerobic).
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.