Resting Heart Rate Calculator

Resting heart rate is easy to measure and easy to measure badly, and on its own it is just a number. This page is about the second half: once you have a trustworthy figure, enter it with your age below and it becomes a set of training ranges built around your fitness rather than around your birthday.

If what you want is the reference table — what counts as normal at each age and what a high or low value means — that lives on normal resting heart rate by age. The short version, from the AHA: 60 to 100 bpm is normal for most adults, lower usually means the heart muscle is in better condition, and an active person may sit as low as 40 bpm.

Measure it so it is worth using

A resting rate that is 10 bpm too high pushes every Karvonen zone up by several beats, so the measurement deserves more care than it usually gets:

• Rest for at least ten minutes first. MedlinePlus sets that as the condition for a resting measurement. The classic version is stricter and better: measure in bed, on waking, before getting up, before coffee and before your phone.
• Count for a full 60 seconds, or 30 seconds doubled. Ten- and fifteen-second counts multiply your counting error along with the beats.
• Use the wrist, on the thumb side, with the tips of your first two fingers — never the thumb, which has a pulse of its own. If you use the neck, sit or lie down first and never press both sides at once.
• Average three or four mornings. One night of bad sleep, a late coffee, a warm room or the first day of a cold will move a single reading enough to mislead you.

A wearable that samples overnight reports a lower, steadier number than a morning hand count. Neither is wrong; they are different measurements. Pick one and stay with it, because everything useful here is a comparison over time.

Three things the number unlocks

Personalized zones. With your maximum and your resting rate, the Karvonen method works from heart rate reserve rather than raw percentages — the same intensity label lands on a different bpm for a fitter heart. The Karvonen formula calculator shows the arithmetic.

A VO2 max estimate. The ratio of maximum to resting heart rate is the entire input to one published estimate of aerobic capacity, which means a lower resting figure directly produces a higher estimate. The VO2 max calculator runs it and is honest about the limits.

A trend. This is the underrated one. Aerobic training lowers resting heart rate over weeks, so a slow downward drift is one of the cheapest confirmations that your plan is working. Equally, a resting rate several beats above your own baseline for a few days is a reliable early sign of an approaching illness, poor sleep, alcohol or accumulated training fatigue — often before you consciously feel it.

What “good” means for you specifically

Comparing yourself to a population range answers a narrow question: whether you are inside normal limits. Comparing yourself to yourself answers the useful one. A runner at 48 bpm and a sedentary person at 78 bpm are both inside the AHA’s normal band; what would be worth noticing is either of them moving 10 beats in a month without an explanation.

Context beats the isolated number in both directions. A low resting pulse with no symptoms in someone who trains is a good sign; the same low pulse with dizziness, weakness or fainting in someone who does not is a reason to be seen. MedlinePlus advises discussing rates that are continually above or below the normal values with a provider, and an irregular pulse always deserves that conversation.

This content is informational and does not replace medical evaluation. See the max heart rate calculator for the other half of the reserve calculation, and the weight loss heart rate calculator for using the zones.