Smartwatches with blood pressure (BP) have become one of the most popular gadgets among health users. Xiaomi, the leader in the wearable electronics market, offers several models with claimed support for this feature. But how does Xiaomi watches that measure pressure actually work, how accurate they are and what nuances to consider when choosing? In this article, we will examine everything from the principles of sensors to comparing popular models and setting instructions.
Many users mistakenly believe that any fitness bracelet or smart watch from Xiaomi can measure pressure as accurately as a professional blood pressure monitor. In fact, it is more complicated: the technology of measuring blood pressure through the wrist is still imperfect, and its results depend on many factors — from the correct position of the hand to individual characteristics of the circulatory system. We will tell you which Xiaomi models are really equipped with this function, how they work and what to do if the readings seem unreliable.
It is important to understand that measuring pressure on a smartwatch is not a medical diagnosis, but an auxiliary tool for monitoring Trends. Even the most advanced gadgets will not replace a doctor’s consultation, but will help to track the dynamics of indicators in everyday life.
What Xiaomi watches can measure pressure?
To date, only a few Xiaomi devices officially support blood pressure measurement, and it is important to distinguish models with full blood pressure support from those where this option is implemented through third-party applications or requires manual data entry.
- 🔹 Xiaomi Watch 2 Pro – flagship model with certified pressure sensor (supports measurement to standard) ISO 81060-2).
- 🔹 Xiaomi Watch S3 — optically sensored PPG to assess blood pressure, but requires calibration using an external tonometer.
- 🔹 Redmi Watch 4: A budget version with basic monitoring function, but without medical certification.
- 🔹 Xiaomi Mi Band 8 Pro - fitness bracelet with experimental support for blood pressure (accuracy lower than that of a full-fledged watch).
Please note: Xiaomi Mi Band models 7/7 Pro and earlier versions do not know how to measure pressure – this feature appeared only in firmware for the Mi Band. 8 Also avoid fakes: clones are often found on the market with the promise of "pressure measurements" that actually just show random numbers.
If you’re looking for maximum accuracy, the Xiaomi Watch 2 Pro is the only model in the lineup to have passed clinical trials, and the rest are more suited for trend tracking than for medical purposes.
How do pressure sensors in Xiaomi watches work?
The technology of measuring blood pressure through a smart watch is based on a combination of two methods: optical PPG-And this is how it works in practice, and this is how it works:
1. PPG-The sensor emits green light that enters the skin and reflects off the blood vessels, and the frequency of the reflected signal allows you to estimate the pulse wave and indirectly the pressure level.
2. Xiaomi algorithms analyze the data obtained, comparing them with reference values (if calibrated with an external tonometer).
3 Additional sensors (accelerometer, gyroscope) adjust the readings taking into account the position of the hand and the activity of the user.
The key nuance: Xiaomi watches do not measure pressure directly, like a mechanical tonometer, but calculate it by indirect signs.
- 📉 Accuracy depends on proper calibration (the first measurement must be carried out simultaneously with the medical tonometer).
- 🕒 Indications may “float” during the day due to changes in blood flow (stress, exercise, body temperature).
- 🚫 Not suitable for people with arrhythmia, tachycardia, or vascular disease – algorithms don’t take these features into account.
Xiaomi Watch 2 Pro and Watch models S3 It uses an advanced sensor with an increased number of LEDs, which slightly improves accuracy. ±10 mmHg compared to medical devices.
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To improve the accuracy of measurements 30 minutes before the procedure, avoid coffee, alcohol and intense physical exertion. It is best to measure pressure in a calm state, sitting on a chair with a back support.
Step-by-step: how to measure the pressure on the watch Xiaomi
The pressure measurement process may vary slightly from model to model, but the overall algorithm is the same, as seen in the Xiaomi Watch 2 Pro (the steps are similar for other devices, but menu items may be different).
Preparation:
- 🕒 Make sure the watch is at least 20% charged – with a low charge, the function can be blocked.
- 🤲 Put your watch on your left hand wrist (if you are right-handed) or right hand (if left-handed), tightly but not squeezing your skin.
- 📱 Install the latest version of Mi Fitness or Zepp Life (depending on the model).
Sizing (first measurement only):
- Put a certified tonometer on the other hand (such as an Omron or a smron). AND).
- Run the measurement on the tonometer and simultaneously activate the function on the clock through the Applications → Pressure. → Sizing.
- Enter the tonometer readings at the hours they request the data.
Pressure measurement:
- Sit on a chair, put your hand with your clock on a table at heart level.
- Run the function through the menu → Health → Pressure (or swipe down and select the tonometer icon).
- Do not move or talk for 30 to 60 seconds while you are freezing.
- After completion, the systolic and diastolic pressure values will appear on the screen.
Density of the strap fitting (not too loose, but also does not crush)
Battery level (minimum 20%)
Lack of movement and conversations during measurement
Right Hand Position (at Heart Level)-->
History view:
All measurements are automatically synchronized with the Mi app. Fitness/Zepp Life, to see the dynamics:
- Open the app on your smartphone.
- Go to the Health section. → Pressure.
- Select a period (day/week/month) to analyze trends.
What to do if your watch does not measure your blood pressure?
Measurement Accuracy: What to Expect from Xiaomi Watches
The main question that users are concerned about is, can you trust the readings of a smartwatch? The answer depends on the model, the measurement conditions and the purposes of use, and we'll do a comparative analysis of accuracy based on tests and user feedback.
| Model | Type of sensor | Certification | Error (compared to medical tonometer) | Features |
|---|---|---|---|---|
| Xiaomi Watch 2 Pro | PPG + algorithms AI | ISO 81060-2 | ± 5-8 mm Hg | Requires calibration 1 time in 4 weeks |
| Xiaomi Watch S3 | Improved. PPG | No. | ±8-12 mm Hg. | Sensitive to arm movement |
| Redmi Watch 4 | Basic PPG | No. | ±10-15 mm Hg. | Suitable only for tracking trends |
| Mi Band 8 Pro | Experimental PPG | No. | ±12-20 mm Hg. | Low accuracy, frequent failures |
The table shows that only Xiaomi Watch 2 Pro is close to medical standards, but its readings are not 100% reliable.
- 🩺 Cardiologists recommend using smart watches only to monitor dynamics, not to make diagnoses.
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Xiaomi watches do not replace a professional tonometer, but they help to track daily pressure fluctuations and notice dangerous trends in a timely manner (for example, a sharp jump after stress).
If accuracy is critical to you, consider alternatives:
- 💡 Huawei Watch D – watch with built-in pump for direct pressure measurement (more accurate than Xiaomi, but more expensive).
- 💡 Omron HeartGuide – medical bracelet tonometer with cuff (gold standard among wearable devices).
Frequent problems and their solutions
Xiaomi watch users with pressure measurement often face common mistakes, and let’s look at the most common ones and how to fix them.
1.The watch does not find the function of measuring pressure
If there is no option in the menu, check:
2.The indications are very different from the tonometer
⚠️ Attention: If the difference between the watch and the medical blood pressure monitor exceeds 15 mm Hg, recalibration is required. Also check: Density of the strap fit (should be tightly fastened, but not crushed vein) Arm position (should lie on a flat surface at heart level). Time of day (in the morning the pressure is usually higher than in the evening).
3.The clock gives off an error "failed to measure"
Causes and solutions:
- 🔋 Low battery power – charge the device up to 50% and try again.
- 💦 Sweat or dirt on the sensor - wipe the bottom of the watch with an alcohol napkin.
- 🤒 Arrhythmia or unstable pulse – in this case, the clock will not be able to correctly measure the pressure.
4.Measurement history is not synchronized with the phone
Try it:
- Restart the Mi app Fitness/Zepp Life.
- Turn off and turn on Bluetooth on your phone again.
- Reconnect the watch to the app (profile) → Devices → Disconnect/Connect).
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If your watch is constantly over- or under-reported, try recalibrating it and re-calibrate it with a medical blood pressure monitor. → Pressure. → Reset calibration.
Comparison with competitors: who is the best pressure gauge?
Xiaomi watches are not the only ones on the market with a BP measurement feature. Let’s compare them with the main competitors to see if it’s worth overpaying for other brands.
| Brand/Model | Type of measurement | precision | Price (2026) | Pluses | Cons |
|---|---|---|---|---|---|
| Xiaomi Watch 2 Pro | PPG + AI | ± 8 mm Hg. | ~15 000 ₽ | Certification ISO, long-term autonomy | Requires calibration |
| Huawei Watch D | Pneumatic sensor (mini pump) | ± 3 mm Hg. | ~25 000 ₽ | Maximum accuracy among smart watches | Large body, high price |
| Samsung Galaxy Watch 6 | PPG + calibration | ±10 mm Hg. | ~22 000 ₽ | Integration with Samsung Health | It only works with Samsung phones. |
| Omron HeartGuide | A full cuff. | ± 1 mm Hg. | ~30 000 ₽ | Medical accuracy | Inconvenient for permanent wearing |
The table shows that the Xiaomi Watch 2 Pro offers the best value for money among smartwatches, but if you want medical accuracy, consider the Omron HeartGuide or Huawei Watch D (despite the high price).
Should you overpay for your competitor? Depends on your goals:
- 🎯 Xiaomi Watch 2 Pro is enough for daily monitoring and trend tracking.
- 🏥 To control hypertension or take medications, it is better to choose the Huawei Watch D or medical bracelet.
- 💰 Redmi Watch 4 is a budget option, but with an understanding of accuracy limitations.
Tips for Choosing Xiaomi Watches with Pressure Measurement
If you decide to buy a Xiaomi watch for monitoring pressure, pay attention to the following criteria:
Purpose of use:
- 📊 Any model with a dynamic tracker is suitable PPG-sensor.
- 🩺 To control hypertension, choose only Xiaomi Watch 2 Pro (with certification).
- 🏃 For sports and fitness, it is better to take the Xiaomi Watch S3 — It has more sports regimes.
Autonomy:
If you want your watch to work for several days without recharging, compare the time of operation in pressure monitoring mode:
- 🔋 Xiaomi Watch 2 Pro: Up to 5 days (with pressure measurement 2 times a day).
- 🔋 Xiaomi Watch S3: Up to 7 days (but with a less accurate sensor).
- 🔋 Redmi Watch 4: Up to 10 days (but higher error).
Compatibility with a smartphone:
Make sure your phone supports the watch app:
- 📱 Mi Fitness – works on Android and iOS, but on iPhone some of the features may be limited.
- 📱 Zepp Life – better optimized for Android, iOS possible lag.
Additional functions:
If you need other options besides pressure, pay attention to:
- 🩺 ECG – only available in Xiaomi Watch 2 Pro (requires certification in your country).
- 💤 Sleep monitoring is best implemented in Xiaomi Watch S3.
- 🏊 Water Protection – All models have 5 ATM, But for swimming, you should choose the Watch 2 Pro.
⚠️ Note: Before buying, check if the selected model is certified for medical use in your country. For example, in the EU and the US, the Xiaomi Watch 2 Pro is sold with ECG disabled due to local regulations.