Yes, many Apple Watch models can record a single-lead ECG in about 30 seconds.
If you are asking, “does Apple Watch have ECG,” the answer depends on your watch model, region, and software. This guide explains how the ECG app works, which models support it, how to take a reading, and what the results can and cannot tell you.
Does Apple Watch have ECG?
Yes, Apple Watch has an ECG feature on many newer models. The ECG app uses electrical sensors built into the back of the watch and the Digital Crown. When you touch the crown with a finger from your opposite hand, the watch creates a single-lead electrocardiogram.
An ECG, also called an electrocardiogram, records the electrical signals that control your heartbeat. Think of it as a short snapshot of your heart’s rhythm rather than a full medical exam.
The Apple Watch ECG app can look for signs of:
• Sinus rhythm, which usually means your heart rhythm looks regular
• Atrial fibrillation, often called AFib
• High or low heart rates that prevent a clear reading
• An inconclusive result
The ECG feature is useful, but it is not a replacement for a doctor, hospital ECG, or heart test. It can offer helpful information when symptoms occur, but it cannot detect every heart problem.
Which Apple Watch models have ECG?
The ECG app is available on selected Apple Watch models. In general, supported models include:
• Apple Watch Series 4
• Apple Watch Series 5
• Apple Watch Series 6
• Apple Watch Series 7
• Apple Watch Series 8
• Apple Watch Series 9
• Apple Watch Series 10
• Apple Watch Ultra
• Apple Watch Ultra 2
The Apple Watch SE models do not include the electrical sensors needed for the ECG app. The original Apple Watch, Series 1, Series 2, and Series 3 also do not support ECG recording.
A newer watch does not always mean better ECG results. The key factor is whether the model has the required electrical heart sensors and whether Apple has approved the ECG app in your country.
Does Apple Watch have ECG in every country?
No. ECG availability depends on local approval. Apple must receive permission from health regulators before enabling the feature in a region.
Your Apple Watch may have the correct hardware, but the ECG app might still be unavailable because of local rules. Availability can also change as Apple receives new approvals.
To check your watch:
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Open the Health app on your iPhone.
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Tap your profile picture.
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Select Health Details or Apps, depending on your iOS version.
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Look for the ECG app and heart health features.
You can also search for the ECG app directly on your Apple Watch. If you cannot find it, check your model, watchOS version, iPhone software, and country availability.
How does the Apple Watch ECG work?
The Apple Watch ECG uses two electrical contact points. One sensor sits on the back of the watch against your wrist. The second sensor is built into the Digital Crown.
During a reading, the electrical signal travels from your wrist, through your body, to the finger touching the crown. The watch measures the timing and pattern of your heartbeat for about 30 seconds.
To take an ECG reading:
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Wear the Apple Watch snugly on your wrist.
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Open the ECG app.
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Rest your arm on a table or in your lap.
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Place a finger from your opposite hand on the Digital Crown.
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Stay still and avoid talking.
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Keep your finger on the crown until the countdown ends.
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Review the result in the Health app.
The watch does not send electricity into your body. It only senses the small electrical signals produced by your heart. This makes the process painless and quick.
For the clearest result, clean and dry your skin. Sweat, water, loose contact, movement, and a poor fit can cause an inconclusive reading.
What can the Apple Watch ECG detect?
The main purpose of the Apple Watch ECG app is to identify signs of atrial fibrillation. AFib is an irregular heart rhythm that can increase the risk of stroke and other health problems.
A reading may show one of these results:
Sinus rhythm
This means the watch detected a regular rhythm during the recording. It is generally a reassuring result, but it does not prove that your heart is completely healthy.
Heart conditions can come and go. A normal ECG at 10:00 a.m. cannot rule out symptoms that appear later in the day.
Atrial fibrillation
This means the watch detected an irregular rhythm that may match AFib. You should contact a health professional, especially if this result is new or happens with symptoms.
A watch result alone does not confirm a medical diagnosis. A clinician may use a medical ECG, exam, blood tests, or other tools to confirm AFib.
High heart rate or low heart rate
The app may not classify the rhythm if your heart rate is too high or too low. Exercise, stress, illness, medication, and poor sensor contact can affect the result.
Inconclusive
An inconclusive result means the app could not classify the recording. This does not automatically mean something is wrong.
Try again while sitting still. If the result continues or you have symptoms, save the recording and discuss it with a health professional.
Poor recording
The watch may show a poor recording when your finger is not touching the crown correctly or when you move during the test. Dry skin, a loose band, and a dirty sensor can also cause problems.
How accurate is the Apple Watch ECG?
The Apple Watch ECG can be useful, but its accuracy has limits. Apple’s regulatory studies found that the ECG app can help identify AFib in suitable users under test conditions. Real-life results may differ.
The watch records a single-lead ECG. In a clinic, a standard 12-lead ECG looks at the heart from several angles. The hospital test gives doctors much more information.
The Apple Watch ECG may not detect:
• A heart attack
• A blood clot
• Heart failure
• High blood pressure
• All types of arrhythmia
• Structural heart problems
• Every episode of AFib
It also may not work well for people with certain implanted devices or conditions. Follow the instructions for your specific Apple Watch and ask your doctor if you have a pacemaker, defibrillator, or other cardiac device.
One practical lesson is easy to miss: a clear reading is not the same as a clean bill of health. Use the ECG as one piece of information. Your symptoms, medical history, and clinical tests matter more.
How to set up ECG on Apple Watch
Before using the feature, update your iPhone and Apple Watch. The ECG app requires a compatible watch, a supported iPhone, and a current enough version of watchOS and iOS.
The exact setup steps may vary, but the process usually looks like this:
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Open the Health app on your iPhone.
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Tap Browse, then Heart.
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Select ECG.
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Follow the setup instructions.
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Enter your birth date when asked.
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Read the safety information.
