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.
Related tools
About this tool
Inputs
- Age
- Resting Heart Rate
- Max Heart Rate (optional)
Results
- Zone 1 (Recovery)
- Zone 2 (Aerobic)
- Zone 3 (Tempo)
- Zone 4 (Threshold)
- Zone 5 (Anaerobic)
When precision matters, guesswork falls short. The Karvonen Heart Rate Calculator applies the correct formula to the values you enter and returns a clear result. Enter age, resting heart rate and max heart rate (optional). The tool processes your data and returns zone 1 (recovery), zone 2 (aerobic), zone 3 (tempo) and other key metrics. Caloric needs combine basal metabolism with an activity multiplier.
Reference ranges published by organizations like WHO and NIH apply to general adult populations and may not suit everyone. Use results as a conversation starter with a healthcare professional, not as a substitute for medical advice. Having a dedicated tool to calculate training heart rate zones using the karvonen method saves time you would otherwise spend searching for formulas or setting up a spreadsheet. Body composition, metabolism, and vital signs interact in complex ways that a single number cannot capture. Use the result as a starting point for deeper analysis. Pair it with other tools for a more complete picture.