How to Check Blood Pressure With Your iPhone

Can an iPhone check your blood pressure by itself?

Not in a way you should rely on. Home blood pressure monitors work by inflating a cuff around your upper arm and sensing the pressure as it releases. An iPhone has no part that does that job.

Some apps promise an exact reading from a fingertip on the camera. The evidence is not on their side. In 2016, Johns Hopkins researchers tested a popular app of this kind, Instant Blood Pressure, against a standard cuff in 85 adults. Its readings were far off, and more than three quarters of the people with high blood pressure would have been told their numbers looked normal.

In December 2025, the American Heart Association published a scientific statement on cuffless devices, meaning wearables and other tools that estimate blood pressure without a cuff. It said these devices should not currently be used to diagnose, track or treat high blood pressure. It also explained that many of them estimate changes relative to a cuff calibration rather than measuring pressure directly.

So the honest answer has two parts. A cuff does the checking. Your iPhone does the remembering, organizing and sharing.

What do you need to check blood pressure with an iPhone?

You need three things:

What	Why it matters
A validated upper-arm cuff	Upper-arm cuffs are preferred over wrist devices. In the US, validated models are listed at validatebp.org.
The right cuff size	A cuff that is too small can push readings up, and one that is too large can pull them down.
A place to log readings	Apple Health, a blood pressure journal app, or both, so each number is saved with its date and time.

Many Bluetooth cuffs can save readings to Apple Health, often through a companion app. A standard cuff works just as well. You simply type the numbers in.

How do you take an accurate home reading?

Good technique matters as much as the device. The American Heart Association and CDC give the same core steps:

1. Prepare. Skip caffeine, smoking and exercise for 30 minutes before. Empty your bladder.
2. Sit correctly. Use a chair with your back supported, feet flat on the floor and legs uncrossed.
3. Position your arm. Rest it on a table so the cuff sits at heart level. Put the cuff on bare skin, just above the bend of your elbow.
4. Rest. Sit quietly for five minutes. Do not talk or scroll on your phone.
5. Measure. Take two or three readings, one minute apart.
6. Be consistent. Measure at the same times each day, for example morning and evening.
7. Record everything. Save every reading, not just the best one.

If slowing down before a reading is hard, a minute of slow breathing can help you settle. Our free breathing pacer guides the pace for you.

How do you log blood pressure on your iPhone?

In Apple Health: open the Health app, tap Browse, then Heart, then Blood Pressure, and tap Add a Measurement. Enter the date, time, systolic and diastolic numbers, then tap Add.

In a blood pressure journal app: a dedicated journal adds context beyond the raw numbers. Pulse Tracker lets you type in the numbers from your own cuff and labels each entry with its American Heart Association stage. You can add mood and notes such as “after coffee” or “before bed,” see weekly trends, and sync entries with Apple Health so everything stays in one place.

Once a reading is saved, check where it falls on our blood pressure chart or with the blood pressure calculator. Here are the adult categories from the 2025 AHA/ACC guideline:

Category	Systolic (mmHg)		Diastolic (mmHg)
Normal	Under 120	and	Under 80
Elevated	120 to 129	and	Under 80
Stage 1 hypertension	130 to 139	or	80 to 89
Stage 2 hypertension	140 or higher	or	90 or higher
Severe hypertension	Higher than 180	and/or	Higher than 120

One reading does not define your blood pressure. Doctors look at the average of several readings taken over days or weeks, which is exactly why a tidy log on your iPhone is useful.

What about a blood pressure estimate between cuff readings?

Some people want a rough sense of how things are going on days they do not use the cuff. Pulse Tracker offers an optional estimate for that, with clear limits.

First, you calibrate it by entering a reading from your own cuff. After that, the app uses the shape and timing of your pulse wave, captured with a fingertip on the iPhone camera, to show an estimate between cuff readings. It is always labeled as an estimate. It is kept separate from your cuff history, and the calibration expires, so it asks for a fresh cuff reading rather than drifting quietly.

Treat the estimate as a prompt, not a result. If it looks higher or lower than usual, take a proper reading with your cuff. Only cuff readings belong in conversations with your doctor.

The same fingertip check also gives you heart rate, which is free and unlimited, plus heart rate variability and respiratory rate. Our guide to measuring your pulse with a phone camera explains how that works.

When should you see a doctor about your blood pressure?

Home logging is a tool to bring to appointments, not a substitute for them. Book a visit if:

• Your home average is 130/80 or higher, or keeps climbing.
• Your readings are often unusually low and you feel dizzy or lightheaded.
• Your numbers change a lot after starting a new medicine. Do not change any medicine on your own; ask your prescriber.

If a reading is higher than 180/120, rest a few minutes and measure again. If it is still that high, contact your doctor right away.

Call emergency services (911 in the US) if a high reading comes with chest pain, shortness of breath, back pain, numbness or weakness, a change in vision, or trouble speaking. Do not wait to recheck in that case.

If you have a heart condition or take blood pressure medicine, talk to your doctor about how often to check and what targets fit you.

Sources

• American Heart Association, How to accurately measure blood pressure at home
• American Heart Association, Cuffless Devices for the Measurement of Blood Pressure: Top Things to Know (scientific statement, Hypertension, 2025)
• American Heart Association, Top 10 Things to Know About the AHA/ACC High Blood Pressure Guideline
• CDC, Measuring Your Blood Pressure
• Plante TB, Urrea B, MacFarlane ZT, et al. Validation of the Instant Blood Pressure Smartphone App. JAMA Internal Medicine, 2016.
• Apple Support, Log your blood pressure in the Health app

Related: Blood pressure chart explained · /blood-pressure-monitor-app/ · /tools/blood-pressure-calculator/ · /guides/measure-pulse-with-phone-camera/

Wellness disclaimer. Pulse Tracker is intended for general wellness use only. It is not a medical device, is not FDA cleared or approved, and is not intended to diagnose, treat, cure or prevent any disease or condition. Blood pressure shown in the app is either a value you entered from your own cuff or an estimate derived from the pulse signal after cuff calibration; it is not a measurement and must not be used to make medical decisions. Read the full wellness disclaimer. Camera readings, estimates and classifications are for general information only and can be affected by movement, lighting, skin temperature and other factors. Do not use them to diagnose, treat or make decisions about a medical condition. Always consult a qualified healthcare professional, and call emergency services if you have chest pain, shortness of breath, fainting or other urgent symptoms.