Plenty of heart rate zone calculators only ask for your age, run 220 − age, and slice the result into zones. That ignores a useful piece of information you already have: your resting heart rate.
Our heart rate zone calculator uses the Karvonen method, which factors in resting heart rate through Heart Rate Reserve (HRR) before building the five zones:
- Fitness-aware — two people with the same age get different zones if their resting heart rates differ, because Karvonen accounts for your baseline instead of ignoring it.
- Instant — enter age and resting heart rate, get all five zones as target BPM ranges immediately, no submit button.
- Shareable — your age and resting heart rate live in the link.
- Honest about limits — 220 − age is a population-average estimate with real individual variance (roughly ±10–15 bpm), and we say so plainly. This is general information, not medical advice — talk to a doctor before starting intense exercise if you have any heart condition or health concerns.
Grab your resting heart rate first thing tomorrow morning — count your pulse for 60 seconds before you get out of bed — and try the calculator with your real numbers. It’s also embeddable on your own site with one iframe.