MayoCalc / Health

Heart Rate Zone Calculator

Find your personalized training zones for fat burn, cardio, and peak performance.

Last updated April 2026
years
bpm
Measure resting HR first thing in the morning before getting out of bed.
Estimated Max Heart Rate
190 bpm
Disclaimer: This tool is for general educational and informational purposes only. It does not constitute medical advice, professional diagnosis, or treatment and is not a substitute for consultation with a qualified healthcare provider. No doctor-patient relationship is created by your use of this tool. Results are estimates based on published formulas and population-level data that may not reflect your individual medical circumstances. Neither MayoCalc nor Cook Media Systems assumes any liability or responsibility for damage or injury (including death) to any person arising from the use of any information, results, or content provided by this tool. Always consult your physician or other qualified healthcare provider with any questions about a medical condition. See our full Disclaimer and Terms of Service.

Understanding Heart Rate Zones

Your heart rate during exercise indicates how hard your cardiovascular system is working. Heart rate zones are defined as percentages of your maximum heart rate (MHR). The most commonly used formula for estimating MHR is 220 minus your age, though this is an approximation with a standard deviation of 10-12 beats per minute. More accurate formulas exist (Tanaka: 208 - 0.7 x age), but all are estimates. The only precise way to determine MHR is through a maximal exercise test.

Max Heart Rate = 220 - Age (traditional)
Max Heart Rate = 208 - (0.7 x Age) (Tanaka formula)

How to Use This Calculator

Enter your age and resting heart rate (measured first thing in the morning before getting out of bed). The calculator shows your estimated maximum heart rate and your five training zones: Zone 1 (50-60% MHR, warm-up/recovery), Zone 2 (60-70%, fat burning/endurance), Zone 3 (70-80%, aerobic fitness), Zone 4 (80-90%, lactate threshold), and Zone 5 (90-100%, maximum effort).

Resting Heart Rate and Fitness

Resting heart rate (RHR) is a useful indicator of cardiovascular fitness. The average adult RHR is 60-100 BPM. Well-trained athletes often have RHR of 40-60 BPM. A lower RHR generally indicates a stronger, more efficient heart. Track your RHR over time: if it is trending downward with consistent exercise, your cardiovascular fitness is improving.

Heart Rate FAQ

Which zone burns the most fat?
Zone 2 (60-70% MHR) uses the highest percentage of fat for fuel, but higher-intensity zones burn more total calories (and more total fat) per minute. For weight loss, total calorie burn matters more than the fuel source. That said, Zone 2 training is sustainable for longer periods, making it excellent for building an aerobic base and overall health.
Is the 220-minus-age formula accurate?
It is a rough estimate with significant individual variation (plus or minus 10-12 BPM). Some people have naturally higher or lower max heart rates. If the formula gives you 180 but you regularly hit 195 during hard exercise without distress, your true max is likely higher than the formula suggests. Consider using the Tanaka formula (208 - 0.7 x age) for a slightly better estimate.

Understanding Heart Rate Zones

Resting heart rate (RHR) for adults typically ranges from 60 to 100 beats per minute (bpm). Well-trained athletes may have RHRs as low as 40-50 bpm. A lower resting heart rate generally indicates better cardiovascular fitness because a stronger heart pumps more blood per beat. Consistently elevated resting heart rate (above 80 bpm) is associated with increased cardiovascular risk in population studies.

Exercise heart rate zones are based on percentage of maximum heart rate (MHR), commonly estimated as 220 minus age. Zone 1 (50-60% MHR) is light activity for warmup and recovery. Zone 2 (60-70%) builds endurance and burns fat efficiently. Zone 3 (70-80%) improves aerobic capacity. Zone 4 (80-90%) increases speed and lactate threshold. Zone 5 (90-100%) develops maximum performance for short bursts. Most health benefits come from spending 150+ minutes per week in zones 2-3, as recommended by the AHA and WHO.

Factors Affecting Heart Rate

Beyond exercise, many factors influence heart rate: caffeine (increases by 3-15 bpm), dehydration (increases by 10-20 bpm for every 1% body water loss), temperature (heat increases heart rate as the body works to cool itself), stress and anxiety (activate the sympathetic nervous system), sleep deprivation (raises resting rate by 5-10 bpm), and medications (beta-blockers lower rate, stimulants raise it). Tracking resting heart rate over time is a simple, reliable way to monitor cardiovascular fitness trends. The Blood Pressure Calculator provides another essential cardiovascular health metric.

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Understanding Heart Rate Zones

Your maximum heart rate is roughly 220 minus your age, though individual variation is significant. Training zones are percentages of that max: Zone 1 (50-60%) is easy recovery, Zone 2 (60-70%) builds aerobic base, Zone 3 (70-80%) is moderate effort, Zone 4 (80-90%) is threshold training, and Zone 5 (90-100%) is all-out effort.

Most cardiovascular benefit comes from Zone 2 training, which feels like "I can talk but I'd rather not." This calculator shows your zones based on age and resting heart rate using the Karvonen formula, which is more accurate than simple percentage of max because it accounts for your fitness level through resting heart rate.