Heart rate 124 on an adult - what does it mean?

Where 124 bpm sits on the adult scale

What a resting pulse of 124 means

If you just climbed stairs, exercised or are very anxious, a pulse of 124 can be a normal response and should fall within minutes. A fast rate that persists at rest can come from fever, dehydration, blood loss or anemia, an overactive thyroid, or a heart rhythm disorder such as atrial fibrillation, atrial flutter or supraventricular tachycardia (SVT).

An irregular pulse at this speed is a typical sign of atrial fibrillation, which raises stroke risk and should always be evaluated.

Ranges apply to adults and children aged 10 and older, measured at rest (American Heart Association). By the numbers: at 124 bpm the heart beats about every 0.48 seconds — roughly 178,560 beats a day.

Working out where 124 falls in your moderate band

The American College of Sports Medicine describes moderate-intensity exercise as roughly 64 to 76 percent of your maximum heart rate. The usual quick estimate of that maximum is 220 minus your age. Put the two together and you can see whether 124 during a workout is a gentle effort, solid moderate work, or the start of something harder.

Here is the arithmetic for four ages:

• Age 30: estimated max 190. Moderate band about 122 to 144. A 124 sits near the bottom of it.
• Age 45: estimated max 175. Moderate band about 112 to 133. A 124 is right in the middle.
• Age 55: estimated max 165. Moderate band about 106 to 125. A 124 is at the top edge.
• Age 65: estimated max 155. Moderate band about 99 to 118. A 124 is about 80 percent of the estimated maximum, which ACSM counts as vigorous.

To do it for yourself: subtract your age from 220, multiply by 0.64 and by 0.76, and round. Those two results are your moderate range.

Why the table below may label it differently

The zone table on this page uses a five-zone system with its own cut-offs, so 124 may appear there as “light” or “moderate” for an age where the ACSM band above says something slightly different. Neither is wrong. Zone systems are training tools built on round percentages, and different organisations draw the lines in different places. What they agree on is the order: the higher the share of your maximum, the harder the work.

Bigger uncertainty comes from the 220 − age formula itself. Real maximum heart rates scatter widely around it, by ten to twenty beats in many people. If you are fitter than average for your age, or simply built that way, your true band may sit higher. If you take a beta blocker, it will sit lower, and percentage targets based on age may not apply at all, so ask your doctor what to aim for.

Using the band, and knowing its limits

Once you know your range, aim to spend most of your weekly exercise inside it. That kind of steady work builds aerobic fitness and, over months, tends to lower the resting pulse as well. A tool such as heart rate zones lets you plan sessions around it.

All of this applies only while moving. If 124 is what you see after sitting quietly for ten to fifteen minutes, the training maths is irrelevant: that is a high resting rate, and a doctor should hear about it the same day.

For a reliable resting value, sit quietly for five minutes first and average a few mornings: Resting Heart Rate: What It Says About Your Health. You can also measure by tapping along on the start page.

Nearby values

• 119 bpm
• 120 bpm
• 121 bpm
• 122 bpm
• 123 bpm
• 125 bpm
• 126 bpm
• 127 bpm
• 128 bpm
• 129 bpm

Measured on a child instead? See heart rate 124 in a child.

Sources: American Heart Association: All About Heart Rate · MedlinePlus: Pulse · ACSM position stand on exercise intensity (2011)

This page explains a single reading in general terms. It is not a diagnosis. Heart rate alone cannot tell whether the rhythm is regular or whether the heart is healthy — if you are worried, talk to a doctor.