Heart Rate Zones Calculator
Calculate your max heart rate and training zone boundaries from age.
Results update as you type.
This calculator provides estimates based on population research. Results are not medical advice. Consult a qualified healthcare provider before making health or nutrition decisions.
How it works
Heart rate zones are the backbone of structured cardio training, dividing effort into bands so you can train each energy system on purpose rather than by guesswork. A heart rate zones calculator estimates your maximum heart rate from your age using the classic 220-minus-age formula, then marks the beats-per-minute boundaries that separate the main training zones. Zone 2, starting near 60 percent of maximum, is the easy aerobic range where you build endurance and burn fat efficiently and can hold a conversation. Zone 3, around 70 percent, is a moderate tempo that improves aerobic capacity. Zone 4, from about 85 percent upward, is the hard threshold and high-intensity range that lifts your ceiling and sharpens speed but can only be held briefly. Training across the right mix of zones, plenty of easy work and smaller doses of hard, is how endurance athletes and everyday exercisers alike make steady progress while managing fatigue. A heart rate zones calculator gives you concrete pulse targets to aim for with a chest strap or wrist monitor, turning vague intensity into numbers. Remember the 220-minus-age formula is a population average and your true maximum can differ by ten to fifteen beats, so the zones are a starting framework rather than exact personal limits. For precise zones, a lab test or field test of your actual maximum or lactate threshold is more accurate. Anyone with a heart condition should get medical clearance before training hard near their upper zones.
Max HR = 220 − age; zone starts at 60%, 70% and 85% of max HR
Maximum heart rate falls gradually with age because the heart's pacemaker cells slow and become less responsive over time, dropping roughly one beat per year, which the 220-minus-age formula approximates for the average adult. Each training zone is then defined as a percentage of that estimated maximum: multiplying by 0.6, 0.7 and 0.85 marks where the easy aerobic, moderate tempo and hard threshold zones begin, giving you concrete beats-per-minute targets to pace your workouts by intensity.
Source:American Heart Association target heart-rate guidance
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter age.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Maximum heart rate updates instantly as you type — no button to press.
Frequently asked questions
How accurate is the 220-minus-age formula?
It is a convenient average but imprecise for individuals, with real maximum heart rates commonly differing by ten to fifteen beats per minute in either direction. Maximum heart rate depends more on genetics and physiology than age alone. Alternative equations such as 208 minus 0.7 times age fit large groups slightly better. For general training the simple formula is adequate, but for serious performance work a measured maximum from a supervised test gives far more reliable zones.
Why is zone 2 training so popular?
Zone 2, the easy aerobic range around 60 to 70 percent of maximum, builds the aerobic base that underpins all endurance. Training here improves your body's ability to use fat for fuel, increases capillary and mitochondrial density, and can be sustained for long durations with low fatigue, so you can accumulate lots of it. Many coaches advise spending the bulk of weekly training in zone 2, reserving harder zones for shorter, targeted sessions.
How do I measure my heart rate during exercise?
A chest-strap monitor is the most accurate for exercise, reading the heart's electrical signal much like an ECG, while wrist-based optical sensors are convenient but can lag or misread during rapid changes and high intensity. You can also check manually by counting your pulse for fifteen seconds and multiplying by four, though this is impractical mid-effort. For zone training, a strap or a good wrist device gives real-time feedback so you can hold the target range.
Should I train in all the zones?
A balanced programme touches several zones for different purposes: easy zones build endurance and aid recovery, moderate zones raise aerobic capacity, and hard zones lift threshold and speed. A common effective pattern is mostly easy training with a smaller share of hard work, sometimes called polarised training. Spending too much time in the moderate middle can leave you tired without the gains of either extreme. Match your zone mix to your goals and recovery.
Is a higher maximum heart rate better?
No. Maximum heart rate is largely determined by age and genetics and is not a measure of fitness, so a higher or lower maximum does not make one person fitter than another. What matters is performance and efficiency at a given effort, such as running faster at the same heart rate as you get fitter. Do not compare your maximum with others; use your own value to set personal training zones.