Heart rate 147 on an adult - what does it mean?

Where 147 bpm sits on the adult scale

What a resting pulse of 147 means

If you just climbed stairs, exercised or are very anxious, a pulse of 147 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 147 bpm the heart beats about every 0.41 seconds — roughly 211,680 beats a day.

Living with diabetes and seeing 147 on your watch

For people who use insulin or sulfonylurea tablets, a sudden pulse of 147 while sitting still has one cause that should be ruled out before anything else: a low blood sugar. When glucose falls, the body releases adrenaline to raise it, and adrenaline drives the heart hard. The sensible first move is to check your glucose, not your pulse again.

Diabetes care uses three levels for lows. Level 1 is below 70 mg/dl. Level 2 is below 54 mg/dl, where the brain starts to run short and quick treatment matters more. Level 3 is any low where you need another person’s help because you are too confused or drowsy to treat yourself.

Watch, CGM and the night-time low

Many people now wear a continuous glucose monitor alongside a smartwatch. Looking at both graphs together can be revealing. A low during sleep often shows up as a jump in heart rate at the same time the glucose line dips. Waking with damp sheets, a headache, vivid dreams or a fast pulse are classic signs of a night-time low that went untreated.

Over time, repeated lows can blunt the warning response, so the shaking, sweating and racing heart become weaker or vanish. This is called hypoglycemia unawareness, and it is one reason a CGM with low alarms is often recommended. A fast pulse is a helpful clue when it appears, but its absence does not prove your glucose is fine.

Common triggers include a delayed or smaller meal, more activity than planned, a dose taken twice, and alcohol, which can cause lows many hours later, even the next morning.

A plan for you and the people around you

• Treat a level 1 or 2 low with fast sugar and recheck after fifteen minutes, as your diabetes team taught you.
• Keep glucose tablets or gel in your bag, car and bedside drawer.
• Ask your doctor about glucagon. It comes as a nasal spray or ready-to-use injection, and family, friends or coworkers can learn to give it.
• Tell people close to you that confusion or odd behaviour may mean a low. If you cannot swallow safely or are unconscious, they should give glucagon if available and call 911, never food or drink.
• Check your glucose before driving, and do not drive while low.

If your glucose is normal and the pulse stays above 120 after resting, the cause lies elsewhere and needs a doctor today. Frequent lows are a reason to review your treatment soon. For how glucose links to other heart rate changes, see the human heart rate.

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

• 142 bpm
• 143 bpm
• 144 bpm
• 145 bpm
• 146 bpm
• 148 bpm
• 149 bpm
• 150 bpm
• 151 bpm
• 152 bpm

Measured on a child instead? See heart rate 147 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.