How a Smart Watch Measures Blood Pressure

blood pressure monitor

Smart Watch Blood Pressure

Fitness trackers offer the convenience of measuring blood pressure directly on the wrist. For increased accuracy, it's essential to position the wrist at heart level during measurement, as readings taken on the arm may be less precise or potentially higher. This discrepancy arises from the fact that the arteries in the wrist are smaller and shallower, influencing how fitness bands gauge blood pressure.

Commonly, fitness trackers employ an oscilloscope for morning and evening measurements. Electronic sensors automatically initiate blood pressure measurement by inflating the smartwatch cuff. This inflation temporarily narrows blood vessels and halts blood flow. To enable blood flow, the pressure is gradually released, and pressure sensors detect pulsations and oscillations in the arteries. The highest value recorded is then utilized to calculate either systolic or diastolic blood pressure, constituting the oscilloscope-based method.

smart watch blood pressure

An alternative technique for precise blood pressure measurement involves Photoplethysmography (PPG). This method utilizes a heart rate sensor equipped with a pulse oximeter. When the sensor illuminates the skin, light absorption occurs, contributing to accurate readings.

Unlike traditional sphygmomanometers that use inflatable cuff technology, fitness trackers using PPG may be slightly less accurate. However, following the user guide can enhance the reliability of results.

To ensure accuracy, certain steps should be followed when measuring blood pressure with a fitness tracker:

  1. Relax and sit down.
  2. Perform the measurement twice for comparison.
  3. Ensure the device is worn on the wrist without being overly tight.
  4. Avoid caffeine, exercise, and smoking prior to the measurement.
  5. Maintain a flat surface for your armrest, such as a desk, with your upper arm at heart level.

When seeking accurate health tracking of blood pressure, users can cross-verify readings by taking their fitness tracker to a doctor's office. If the readings closely align, it confirms the fitness tracker's accuracy.

Various factors can impact the accuracy of fitness trackers' blood pressure readings, including environmental conditions, time of day, exercise, and dietary habits. Comparing readings from fitness trackers and blood pressure monitors helps assess accuracy.

smart band watch

Pros and cons of fitness trackers measuring blood pressure include:


  1. User-friendly.
  2. Motivational for fitness routines.
  3. Portable blood pressure measurement.
  4. Provides insights into heart health.
  5. Convenient for home use.


  1. Sensitivity to movement.
  2. Slightly less accuracy compared to blood pressure monitors.

Twellmall BP Doctor Pro 12 4.0 Circle Dial Blood Pressure Smartwatch uses an air bag to pressurize the wristband when measuring blood pressure. The 12-band circuit accurately captures each blood pressure signal and provides 24-hour real-time feedback.


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