Karvonen Heart Rate Calculator
The Karvonen method sets a target heart rate by counting from your resting rate, not from zero. It is one common way to talk about exercise effort. This page gives general information only.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Your estimated maximum heart rate is the classic 220 minus your age. The heart rate reserve is that maximum minus your resting rate.
The target is your resting rate plus the chosen share of the reserve. A share of about 60% is often used for easy effort. Heart rate estimates are rough, and some medicines change heart rate, so read the result with that in mind.
Worked example
At age 40, with a resting rate of 60, 60% of your reserve gives a target of about 132 beats a minute.
Questions
How do I find my resting heart rate?
Count your pulse for a full minute after waking and before getting up. Do it on a few mornings and use the average.
How exact is the maximum heart rate estimate?
Not very. Real maximums vary a lot between people of the same age, so the estimate is a starting point only.
Should I check with a doctor first?
Yes, if you have a heart condition, take heart medicine, or feel unwell during activity. A doctor can set limits that fit you.
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