Heart Rate Zone Calculator
Calculate personalized training heart rate zones from your age (and optionally resting heart rate).
Calculate personalized training heart rate zones from your age (and optionally resting heart rate).
How Heart Rate Zone Calculator Works
Maximum heart rate is estimated as 220 minus your age, and training zones are set as percentages of that maximum. If you provide a resting heart rate, the calculator instead uses the Karvonen method, which factors in your heart rate reserve (the gap between resting and maximum) for a more personalized zone estimate.
Who Uses Heart Rate Zone Calculator and Why
- Setting up training zones for interval or endurance workouts based on percentages of estimated maximum heart rate.
- Getting a more personalized zone estimate by adding resting heart rate and using the Karvonen method instead of the simpler age-only calculation.
- Comparing zones estimated from age alone against zones estimated with heart rate reserve factored in, to see how much difference resting heart rate makes.
- Setting a target heart rate range for a specific training goal (like fat-burning or aerobic-base pace) using the zone breakdown.
Mistakes to Avoid
- Leaving resting heart rate blank when you actually know it, missing out on the more personalized Karvonen-based zones the calculator offers — the FAQ notes this method better reflects individual cardiovascular fitness than the flat 220-minus-age approach.
- Measuring resting heart rate right after waking up versus after already being active for a while — these can differ meaningfully, so use a consistent measurement approach (commonly first thing in the morning, still lying down).
- Treating the age-based maximum heart rate (220 minus age) as a precise personal number rather than a population average estimate, which can be off by a meaningful margin for any individual.
Tips for Best Results
- If you know your actual resting heart rate (measured calmly, ideally first thing in the morning), enter it for Karvonen-based zones that account for your personal heart rate reserve rather than just age.
- Recalculate periodically as fitness changes resting heart rate, since a lower resting heart rate from improved cardiovascular fitness will shift Karvonen-based zones even at the same age.
Fixing Common Problems
My zones look different depending on whether I enter a resting heart rate. — That's expected — leaving resting heart rate at the default uses the simple age-only formula, while entering a real resting heart rate switches to the Karvonen method, which factors in your heart rate reserve and can shift the zones meaningfully.
Terms Explained
Karvonen method: A heart rate zone calculation that factors in heart rate reserve (maximum minus resting heart rate) rather than just a flat percentage of maximum heart rate, producing more individualized training zones.
Heart rate reserve: The gap between resting heart rate and maximum heart rate, used by the Karvonen method as the basis for calculating personalized training zones.