Maximum Heart Rate Zone Calculator
For your goal
Enter age and resting HR, choose a goal, confirm adult scope, then select Calculate zones.
These zones are exercise-intensity estimates, not medical limits. If you have a heart condition, take heart-rate-affecting medication or have been advised to limit exercise, use individualized professional guidance. Stop exercise and seek medical help for chest pain, faintness, unusual shortness of breath or other concerning symptoms.
Private by default: inputs and results stay in this tab’s memory. No automatic saving, calculation request or input-sharing URL. Refreshing resets the form.
About this calculator
Estimate five heart-rate reserve training zones from age and resting heart rate, with a highlighted range for your selected goal and clear limits on precision.
Heart-rate zones are estimates of exercise intensity and are not measured physiological thresholds or medical exercise prescriptions. The highlighted range is a practical starting point for understanding the model, not a requirement to exercise at that intensity.
How to use the Maximum Heart Rate Zone Calculator
Enter age and resting heart rate, choose a training goal, confirm that you are 18 or older, then select Calculate zones. The initial example uses age 30, resting HR 60 bpm and Endurance. After calculating, valid edits update the result; invalid entries remove stale zones.
Advanced options contains two choices: the age-prediction formula and an optional user-provided measured maximum. Changing goals only changes the highlighted zone, not the five calculations. Copy zones exports result text explicitly; no input-sharing link or automatic storage is created.
What maximum heart rate means
Maximum heart rate, or HRmax, refers to the highest heart rate attained during maximal effort. An age equation predicts a population-average value; it does not observe your heart during exercise or establish a safe upper limit.
If you already have a reliable maximal-test result or known training value, you may enter it as an override. This tool cannot verify how it was obtained. A smartwatch peak is not automatically a laboratory-confirmed maximum, and you should not attempt an unsupervised maximal test solely to obtain this input.
Why maximum heart rate is estimated
Without an entered maximum, this calculator uses an age-based prediction. Such equations describe average relationships and can differ substantially from one person’s actual maximum.
In the HERITAGE Family Study comparison, standard errors of estimate were 12.4 bpm for 220 − age and 11.4 bpm for Tanaka. These study-specific errors illustrate uncertainty; they are not a personalized confidence interval or a guaranteed error bound. A different formula does not remove individual variation.
The 220 minus age formula
Estimated Max HR = 220 − age
This is the default simple estimate. The American Heart Association presents it as an approximate guide and notes that its figures are averages. At age 30 the equation gives 190 bpm.
AHA’s general target chart uses percentages of maximum heart rate. This calculator instead uses heart-rate reserve after incorporating resting HR; the two percentage systems should not be confused.
The Tanaka maximum-heart-rate formula
Tanaka estimated Max HR = 208 − (0.7 × age)
Tanaka and colleagues developed this equation using a meta-analysis and laboratory validation in healthy adults. At age 30 it predicts 187 bpm. It remains a prediction, not a measurement or universally exact improvement for every person.
With measured maximum enabled, the selected formula supplies only the age-predicted comparison; the entered maximum determines reserve and zones.
What heart-rate reserve means
Heart-rate reserve = maximum HR used − resting HR
Reserve is the difference between the two values. For a maximum of 190 and resting HR of 60, reserve is 130 bpm. This is not itself a target exercise pulse or a fitness diagnosis.
If resting HR is at least the selected maximum, the inputs do not provide positive reserve. The tool asks you to review them and produces no normal zones.
How the Karvonen formula works
Target HR = resting HR + (heart-rate reserve × intensity fraction)
For 60 bpm resting and 130 bpm reserve, 50% HRR is 60 + 130 × 0.50 = 125 bpm. At 60% HRR it is 60 + 130 × 0.60 = 138 bpm. The resting value is added back after multiplication.
The engine keeps decimal precision. It does not calculate targets as a percentage of maximum alone, and it does not round the predicted maximum before calculating reserve.
How the five training zones are calculated
The product uses five continuous HRR bands: 50–<60%, 60–<70%, 70–<80%, 80–<90% and 90–100%. Each lower edge is included; the next edge belongs to the next zone. Zone 5 includes the maximum. These bands cover the upper half of reserve, not every possible exercise intensity.
This is a practical five-zone framework, not a universal medical standard. Federal Physical Activity Guidelines discuss reserve-based relative intensity more broadly; their aerobic-capacity-reserve example describes 40–59% as moderate and 60–84% as vigorous. ACSM guidance likewise places 40–<60% HRR in moderate intensity and 60% or more in vigorous intensity. Different frameworks have different boundaries.
Consequently, this model does not call Zone 2 universally easy or label Zone 3 medically “moderate.” Lower range, Endurance, Tempo, Hard and Very hard are product names. They do not locate physiological thresholds.
For whole-bpm displays, round the lower edge upward. For Zones 1–4, round the next edge upward and subtract one; for Zone 5, round the maximum downward. This assigns each representable integer to exactly one band. When reserve is too narrow for five integer bands, empty bands say No whole-bpm range and show the continuous interval, with a review notice. No reversed or fabricated range is shown.
What heart-rate zones can and cannot tell you
The calculator can organize arithmetic ranges and highlight a product default: Fat burn and Endurance → Zone 2, Fitness → Zone 3, Hard training → Zone 4. Goal selection does not change reserve or boundaries.
Fat burn means a sustainable aerobic-work option toward the lower end of this model, which may still feel vigorous. It does not guarantee greater body-fat loss or a special fuel-use outcome. Overall activity, energy intake and consistency matter. Lower-intensity work can also support fitness; no goal requires Zone 4 or Zone 5.
Heart-rate zones are not measured thresholds
Calculated HRR zones do not directly identify aerobic, anaerobic, lactate or ventilatory thresholds. Those concepts involve physiological responses that require more specific testing or assessment.
No exercise stress test, lactate test, ventilatory assessment or VO₂ max measurement occurs here. A zone name or sharp numerical boundary should not be mistaken for a measured change in your physiology.
How to measure resting heart rate
Measure when calm and at rest. AHA suggests morning after a night’s sleep, before getting out of bed or having coffee, as a useful time.
Use two fingertips on the thumb side of the wrist, press lightly, count beats for 30 seconds and multiply by two. One reading is not definitive; repeat under similar relaxed conditions if uncertain. The supported 30–120 bpm range is an input limit, not a classification of normal or abnormal heart rate.
How heart-rate zones may feel
The five cards offer approximate effort cues. Breathing, experience and the type of activity all influence how a given pulse feels. The labels are not exact physiological tests.
CDC’s talk test describes moderate effort as allowing talking but not singing; during vigorous activity only a few words may be possible before pausing for breath. It provides broad context, not a one-to-one mapping onto these five HRR bands. Do not assume full sentences will be comfortable just because a card says Endurance.
Medications and factors that affect exercise heart rate
Heart-rate-affecting medications can change the usefulness of an age prediction and target range. AHA advises individualized guidance when a heart condition or medication affects exercise heart rate. The calculator does not ask for medication names or compute dosing or beta-blocker adjustments.
Heat, hydration, fatigue, fitness and device error can affect readings or response. An ACSM-hosted research commentary explains how heart rate can rise during prolonged constant-load exercise without a matching increase in metabolic intensity. This heart-rate drift is one reason to use perceived effort and context as well as the number.
These are not medical limits. Follow individual exercise restrictions. If chest pain, faintness, unusual shortness of breath or other concerning symptoms develop, stop exercise and seek medical help rather than trying to stay inside a calculated band.
Assumptions and limitations
Adult educational exercise planning only; no pediatric zones, cardiac rehabilitation prescription or clearance for maximal exercise. Existing site health limitations also exclude pregnancy, breastfeeding and therapeutic planning.
Age accepts whole years from 18 to 100. Resting HR accepts 30–120 bpm and entered maximum 100–240 bpm, each in whole bpm or one decimal place. These broad engineering limits are not proof that a value is medically normal or suitable. The maximum must exceed resting HR. Invalid hidden measured-max drafts are ignored when the override is off.
The formulas, five-band split and goal defaults do not account for all individual differences, sports, medical conditions or training histories. A correctly calculated number can still be an unsuitable exercise target. Perceived effort and professional guidance remain relevant.
Worked example
Age 30, resting HR 60 bpm and 220 − age produce estimated Max HR 190 bpm and reserve 130 bpm. Exact continuous edges are 125, 138, 151, 164, 177 and 190 bpm.
- Zone 1 · Lower range: 125–137 bpm · 50–<60% HRR
- Zone 2 · Endurance: 138–150 bpm · 60–<70% HRR
- Zone 3 · Tempo: 151–163 bpm · 70–<80% HRR
- Zone 4 · Hard: 164–176 bpm · 80–<90% HRR
- Zone 5 · Very hard: 177–190 bpm · 90–100% HRR
For Endurance, Zone 2 is highlighted: 138–150 bpm.
Heart-rate zone FAQ
How do I calculate my maximum heart rate?
The default age estimate is 220 minus age. Advanced options offers Tanaka or an entered maximum. None of these inputs makes this page a maximal exercise test.
What is the Karvonen formula?
Add resting HR to a chosen fraction of heart-rate reserve: resting HR + (maximum HR − resting HR) × intensity.
What is heart-rate reserve?
It is maximum HR minus resting HR. Maximum must exceed resting for the calculation to provide positive reserve.
Is 220 minus age accurate?
It is a simple population-average prediction with substantial individual uncertainty. It is not your measured maximum or a medical limit.
Is the Tanaka formula better?
It has a meta-analysis and laboratory-validation basis in healthy adults, but can still differ substantially from an individual’s measured maximum. No formula is guaranteed best for everyone.
What zone should I train in for endurance?
This tool highlights Zone 2 as its endurance default. At 60–<70% HRR it may be vigorous. It is not a prescription or a measured aerobic threshold.
Is Zone 2 the fat-burning zone?
No zone here guarantees greater body-fat loss. Fat burn is a goal label that highlights a lower band within this model, without claiming a unique fat-loss effect.
How should I measure resting heart rate?
Check when relaxed, such as after waking before getting up or having caffeine. Count your wrist pulse for 30 seconds and double it; recheck if a reading seems unrepresentative.
Can medication change my heart-rate zones?
Medication that affects heart rate can alter target interpretation. Seek individualized guidance; do not adjust medication based on this calculator.
Are heart-rate zones the same as aerobic and anaerobic thresholds?
No. These are calculated reserve bands, not measurements of aerobic, anaerobic, lactate or ventilatory thresholds.
Sources and methodology review
Methodology reviewed September 28, 2026. Sources support formula provenance, uncertainty and broad intensity context. The five exact bands, names and goal mappings are product choices, not source-endorsed medical prescriptions.
- American Heart Association: Target Heart Rates (opens in a new tab)
- Tanaka et al. (2001): Age-predicted maximal heart rate revisited (opens in a new tab)
- Physical Activity Guidelines for Americans, second edition (opens in a new tab)
- CDC: How to Measure Physical Activity Intensity (opens in a new tab)
- ACSM-hosted research commentary: Mind the Drift of HR (opens in a new tab)
- HERITAGE Family Study: Measured versus age-predicted maximal heart rates (opens in a new tab)
- ACSM (2015): Updating exercise preparticipation health screening recommendations (opens in a new tab)
- CDC: Physical Activity and Your Weight and Health (opens in a new tab)
The ACSM-hosted drift article is a research commentary whose authors’ views do not necessarily represent ACSM policy. No source turns these calculated zones into direct physiological measurements.