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Apple Watch ECG works on Apple Watch Series 4 or later and all Apple Watch Ultra models; Apple Watch SE models are excluded. Whether you can use it also depends on ECG availability in your country or region, and setup requires a paired iPhone and compatible software.
Before buying a watch specifically for ECG, check Apple’s ECG support guidance and its watchOS feature-availability list for your location.
Apple Watch models with ECG
Apple’s compatibility rule is Series 4 or later, plus all Apple Watch Ultra models. Apple Watch SE is not supported. The Series 4 introduced the electrical heart sensor used for ECG; the app creates a recording using the electrodes in the Digital Crown and the rear of the watch.
| Model family | ECG support | Important note |
|---|---|---|
| Apple Watch Series 4 or later | Yes | All Series models from Series 4 onward are eligible, subject to regional availability and setup requirements. |
| Apple Watch Ultra | Yes | Apple includes all Ultra models. |
| Apple Watch SE | No | SE models are excluded, even though they may include other health features. |
| Apple Watch Series 3 or earlier | No | These models fall outside Apple’s Series 4-or-later compatibility rule. |
Apple’s ECG support article gives the compatible model rule. Do not infer ECG support from optical heart-rate monitoring or other health features alone.
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- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
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Does Apple Watch SE have ECG?
No. Apple Watch SE models do not support the ECG app. “Series 4 or later” refers to the Series model family, not every Apple Watch released after Series 4. If ECG is essential, choose a Series 4-or-later model or an Ultra, and confirm that the feature is available in your location.
What to check before buying
ECG support is not determined by a single specification. Confirm these points before purchase:
- Model family: Choose Series 4 or later or an Apple Watch Ultra. Avoid SE if ECG is required.
- Country or region: ECG is available only in supported locations, and availability can change. Check Apple’s live feature-availability list.
- iPhone and software: Use a paired iPhone and update the iPhone and watch to the latest software they support.
- Setup: ECG must be set up in the Health app on iPhone before you can take a recording.
How to set up the ECG app
- Update the paired iPhone to the latest iOS it supports and Apple Watch to the latest watchOS it supports.
- Open the Health app on iPhone.
- Tap Browse, then Heart.
- Tap Electrocardiograms (ECG).
- Tap Set Up ECG App and follow the onscreen instructions.
If ECG still does not appear on the watch, open the iPhone’s Watch app, tap Heart, and install ECG from the ECG section if that option is available. Apple says the ECG app is not intended for people under 22.
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- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
How to take an Apple Watch ECG
- Wear the watch snugly on the wrist selected in the Watch app.
- Rest your arm on a table or in your lap.
- Open the ECG app on Apple Watch.
- Touch and hold the Digital Crown with a finger from the opposite hand. Do not press the crown.
- Stay still until the 30-second recording finishes.
- Review the classification, add symptoms if you want, and save the recording.
The waveform, classification, and any symptoms you note are stored in Health. You can export a PDF of the recording from Health to share with a doctor.
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The ECG app creates a waveform similar to a single-lead (Lead I) ECG and checks a recording for signs of atrial fibrillation (AFib). It is an on-demand recording, not a continuous ECG monitor. A sinus-rhythm result describes that particular recording; it does not establish that you are healthy.
Apple says the ECG app cannot detect a heart attack, stroke, blood clots, high blood pressure, congestive heart failure, high cholesterol, or other forms of arrhythmia. It is not a substitute for clinical evaluation. If you have chest pain or think you may be having a heart attack, contact emergency services; seek medical advice if you feel unwell or have symptoms.
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- The most crack-resistant front crystal yet on an Apple Watch, IP6X dust resistance, and swimproof design just to name a few awesome features
- Take an ECG anytime, anywhere - Get high and low heart rate, and irregular heart rhythm notifications - Measure your blood oxygen with a powerful sensor and app
- Track your daily activity on Apple Watch, and see your trends in the Fitness app - Stay in the moment with the new Mindfulness app, and reach your sleep goals with the Sleep app
- Track new tai chi and pilates workouts, in addition to favorites like running, yoga, swimming, and dance - Sync your favorite music, podcasts, and audiobooks - Pay instantly and securely from your wrist with Apple Pay
ECG versions and heart-rate ranges
ECG app features and version availability can differ by region because of local regulations. Apple documents different AFib classification ranges for ECG versions 1 and 2:
| ECG app version | Documented AFib-check range |
|---|---|
| Version 1 | 50–120 beats per minute (BPM) |
| Version 2 | 50–150 BPM |
These are app classification ranges, not general definitions of a normal heart rate. To check your version, open Settings > Heart > ECG on Apple Watch, or Health > Browse > Heart > ECG > About on iPhone. See Apple’s ECG app version guidance.
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A recording may be inconclusive if the rhythm or circumstances fall outside the app’s intended classification or if the signal is poor. To improve the recording:
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- Advanced Health Monitoring: Includes ECG support, heart rate tracking, blood oxygen monitoring, and sleep insights.
- Precision Finding for iPhone: Helps locate compatible iPhone devices using directional guidance.
- Keep the band snug so the back of the watch contacts your wrist.
- Rest your arms and stay still for the full recording.
- Make sure your wrist, hand, and watch are clean and dry.
- Move away from plugged-in electronics that could cause electrical interference.
- After swimming, showering, heavy sweating, or hand-washing, allow the watch to dry; Apple says this may take an hour or more.
Some people may not produce a strong enough signal, and a clean-looking reading does not rule out conditions the app cannot detect. Discuss concerning or repeated results with a healthcare professional.
How to share an ECG with a doctor
- Open the Health app on iPhone.
- Tap Browse, then Heart.
- Tap Electrocardiograms (ECG) and select a recording.
- Choose the option to export a PDF for your doctor.
- Use the share controls to send, print, or save the PDF.
The recording is a single-lead ECG and is not equivalent to a standard clinical 12-lead ECG.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How accurate is Apple Watch ECG?
Apple reports that a clinical trial of approximately 600 subjects found 99.6% specificity for sinus-rhythm classification and 98.3% sensitivity for AFib classification among classifiable results. These figures are not a blanket accuracy claim: Apple cautions that real-world use can produce more inconclusive or unclassifiable recordings.
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Frequently Asked Questions
Which Apple Watch has ECG?
Apple Watch Series 4 or later and all Apple Watch Ultra models support ECG, subject to regional availability and setup requirements. Apple Watch SE models do not.
Does Apple Watch SE have ECG?
No. Apple excludes Apple Watch SE models from ECG support.
How do I set up ECG on Apple Watch?
Update the paired iPhone and watch, then open Health on iPhone and go to Browse > Heart > Electrocardiograms (ECG) > Set Up ECG App. Follow the onscreen instructions.
How do I take an ECG on Apple Watch?
Wear the watch snugly, rest your arm, open the ECG app, and touch and hold the Digital Crown with a finger from your opposite hand for 30 seconds while staying still.
Can Apple Watch ECG detect a heart attack?
No. Apple says the ECG app cannot detect a heart attack. Contact emergency services if you have chest pain or think you may be having one.
Why is Apple Watch ECG unavailable in my location?
Availability depends on country or region and can change due to local regulations. Check Apple’s watchOS feature-availability list for your location.
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