How to Use Heart Rate Zone Calculator
Find your estimated maximum heart rate and the five target training zones (from recovery to maximum effort) using the Karvonen heart-rate-reserve method, based on your age and resting heart rate.
Open the Heart Rate Zone Calculator tool →What is Heart Rate Zone Calculator?
Calculate your max heart rate and the five training zones using the Karvonen method. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Heart Rate Zone Calculator
- Open the Heart Rate Zone Calculator tool.
- Enter your details or values.
- The result is calculated instantly.
- Copy or use the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
Which zones does it calculate?
Your estimated maximum heart rate and the five training zones, using the Karvonen (heart-rate reserve) method.
Why use the Karvonen method?
It factors in your resting heart rate, giving more personalised zones than a simple percentage of max.
Is this medical advice?
No — it's for training guidance. Check with a doctor before intense exercise if you have health concerns.
Ready to try it?
Open Heart Rate Zone Calculator →