How to Fix Inaccurate Heart Rate Monitoring on Wearables

Step by step

1. 1 min

   Adjust the band tension

   Ensure the device is snug against your skin, roughly one finger-width above your wrist bone. A loose band allows ambient light to interfere with the optical sensor's green LED readings. Tighten the strap until it maintains consistent skin contact without restricting blood circulation.

   Note: For high-intensity workouts, tighten the band one additional notch to compensate for increased arm movement.
2. 1 min

   Clean the sensor array

   Turn the device over and inspect the glass back for sweat, dust, or lotion residue. Use a dry, lint-free microfiber cloth to wipe the sensor surface clean. If residue persists, dampen the cloth slightly with fresh water and wipe again before drying completely.

   Note: Avoid using harsh chemicals or abrasive cleaners as they can scratch the sensor lens.
3. 1 min

   Toggle heart rate tracking

   Navigate to Settings > Privacy & Security > Health on your paired smartphone. Locate the heart rate setting and toggle the switch off, wait ten seconds, and toggle it back on to reset the data polling process. This forces the device to re-initialize the connection between the sensor and the health database.

4. 1 min

   Perform a hard restart

   Execute a hard reset on the wearable to clear temporary cache errors affecting sensor frequency. Hold the crown or side button simultaneously with the power button until the screen goes dark and the device logo reappears. This ensures all background sensor processes restart cleanly.

   Note: Do not release the buttons until the logo appears to ensure a full hardware-level reset.
5. 1 min

   Verify software version

   Go to General > Software Update on your watch or the companion app on your phone. If an update is available, initiate the installation to patch known sensor firmware bugs. Developers frequently release updates to refine the algorithms that calculate heart rate metrics during intermittent sampling.

   Note: Ensure your device has at least 50% battery or is connected to the charger before starting an update.