Estimate light, moderate, and intense exercise heart rates with the heart-rate-reserve method.
Use a resting pulse measured under calm, consistent conditions.
Educational estimate only. It is not medical advice, a diagnosis, or a substitute for assessment by a qualified healthcare professional. Exercise targets may be inappropriate with symptoms, heart conditions, pregnancy, or medicines that affect pulse.
This target heart rate calculator estimates three exercise pulse levels using age, resting heart rate, and the heart-rate-reserve method. The displayed points correspond to 50%, 70%, and 85% of reserve added back to resting pulse.
These are broad planning estimates for adults, not diagnoses or personal exercise prescriptions. Medicines, heart conditions, pregnancy, heat, altitude, illness, and fitness can change a safe or useful training response.
For a better resting value, measure under consistent quiet conditions and consider several mornings. Stop exercise and seek appropriate help for chest pain, fainting, severe breathlessness, or other urgent symptoms.
Estimated maximum HR = 220 − age
Heart-rate reserve = estimated maximum HR − resting HR
Target HR = resting HR + intensity × heart-rate reserve
The three intensities used are 0.50, 0.70, and 0.85. Results are rounded to whole beats per minute.
| Entry or result | Meaning |
|---|---|
| Age | Completed years, accepted from 18 through 100. |
| Resting HR | Pulse at rest in beats per minute. |
| Maximum HR | Age-based estimate, not a measured maximum. |
| Reserve | Difference between estimated maximum and resting rate. |
| Intensity | Selected fraction of reserve. |
For a 40-year-old with a resting pulse of 60 bpm, estimated maximum is 220 − 40 = 180 bpm. Reserve is 180 − 60 = 120 bpm.
The targets are 60 + 0.50 × 120 = 120 bpm, 60 + 0.70 × 120 = 144 bpm, and 60 + 0.85 × 120 = 162 bpm.
Read the outputs as estimated points on a continuum, not exact boundaries between safe and unsafe effort. Day-to-day heart rate changes with sleep, hydration, temperature, stress, caffeine, and accumulated fatigue.
The familiar 220 − age equation has substantial individual error. A measured maximum from an appropriately supervised test may differ. Do not attempt an all-out test solely to replace this estimate without considering health status and professional guidance.
The reserve method includes resting pulse, so two people of the same age can receive different targets. A falling resting pulse may reflect training adaptation, but measurement conditions and health also matter.
Heart-rate monitors can lag or misread, particularly wrist sensors during rapid movement. Pair the number with how the effort feels and, where appropriate, the talk test. The American Heart Association describes moderate and vigorous zones as broad percentages of maximum heart rate; those are a different method from reserve percentages.
Beta blockers and other medicines can blunt or alter heart-rate response. People with cardiovascular, pulmonary, metabolic, or other relevant conditions should use targets supplied by a qualified clinician or rehabilitation team.
Beginners commonly start near the lower end and progress gradually. Session duration, frequency, activity type, recovery, and symptoms matter as much as a single pulse reading.
The page’s “light,” “moderate,” and “intense” labels are convenient labels for its three points. They should not be treated as a clinical classification. Record the formula used when comparing results from another source.
Use the same resting measurement method when tracking change over time. Sitting versus lying down, manual pulse counting versus a device, and different counting intervals can shift the value. An unexpected persistent change deserves context and, when concerning, professional advice.
Enter resting heart rate in beats per minute, measured while calm. The old target-heart-rate wording was ambiguous; the reserve formula specifically needs resting pulse.
No. It is a population-based estimate with substantial individual variation. A person’s measured maximum can be higher or lower.
The method first takes a percentage of the range between resting and estimated maximum, then adds the resting baseline to locate that effort level.
No. They are general estimates. Health conditions, symptoms, medicines, and professional instructions can require a different approach.
Measure while relaxed under repeatable conditions, often after waking and before activity. Several readings provide more context than one unusual day.
Devices may use percent of maximum, reserve, a measured threshold, or a proprietary method. Check its formula and personal settings before comparing labels.
Some heart medicines change exercise pulse response. Ask the prescribing clinician or rehabilitation team for suitable intensity guidance rather than relying on this estimate alone.