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How accurate is heart rate monitoring on the Galaxy Watch 8?

By ShopSavvy Team

Published: January 20th, 2026

2 min read

Last Updated: January 20th, 2026

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❤️The Samsung Galaxy Watch 8 includes an upgraded optical heart rate sensor with improved skin contact through the new case design.

Accuracy by Activity Level

Resting and Low-Intensity Activities:

Typically accurate within 3-5 BPM of chest strap measurements
Reliable for daily fitness tracking and trend monitoring

Moderate-Intensity Activities:

Generally accurate within 5-8 BPM
Minor variations possible during irregular arm movement

High-Intensity Activities:

Accuracy decreases with intense movement
Chest strap recommended for precise heart rate zone training

Heart Rate Features

24/7 continuous heart rate monitoring
Resting heart rate tracking
Real-time workout heart rate display
Automatic heart rate zone calculation
Heart rate variability (HRV) for stress monitoring
High and low heart rate alerts (customizable thresholds)
Irregular heart rhythm detection (potential AFib notification)

Factors Affecting Accuracy

Optimal conditions:

Snug fit one finger-width above wrist bone
Clean sensor area
Comfortable room temperature
Consistent skin contact

Accuracy may decrease with:

Wrist tattoos (ink blocks optical sensor light)
Cold temperatures (reduced blood flow to skin surface)
Rapid arm movement during exercise
Loose watch fit
Sweat or debris on sensor

Comparison to Other Smartwatches

The Galaxy Watch 8 performs comparably to premium competitors including Apple Watch Series 10 and Garmin Venu devices. All optical wrist sensors share similar limitations during high-intensity activities.

When to Add a Chest Strap

Consider using a compatible chest strap for:

Heart rate zone training
Competitive athletic performance tracking
VO2 max testing
Situations requiring clinical-level accuracy

The watch pairs with Bluetooth heart rate straps and will use their data for improved accuracy during workouts.

How we researched this

Where this comes from: This answer is based on ShopSavvy's product database, real-time pricing from thousands of retailers, and a look at hundreds of user reviews to give you a well-rounded picture.