![Samsung Galaxy Watch 8 (2025) 40mm Bluetooth Smartwatch, Cushion Design, Fitness Tracker, Sleep Coaching, Running Coach, Energy Score, Heart Rate Tracking, Silver [US Version, 2 Yr Warranty] Silver 40mm Bluetooth Watch8](https://i.shopsavvy.com/https://x.shopsavvy.com/https://m.media-amazon.com/images/I/31LaWf6wVqL._SL500_.jpg)
The Samsung Galaxy Watch 8 heart rate monitor is accurate for everyday fitness tracking but less precise than chest straps during intense exercise.
Accuracy Statistics
Clinical testing of similar Samsung technology:
- Average error: 3.4% (vs Apple Watch at 1.8%)
- High-intensity: Gap widens during interval training
Best Accuracy Conditions
- Resting heart rate measurements
- Light to moderate exercise
- Steady-state cardio
- Snug, stable watch fit
- Clean sensor contact
Reduced Accuracy Factors
- HIIT and interval training
- High wrist movement activities
- Cold conditions
- Loose watch fit
- Arm tattoos
- Sweaty/dirty sensors
BioActive Sensor Technology
Multi-sensor approach:
- Optical (PPG): Light-based blood flow detection
- Electrical (ECG): Heart electrical activity
- Bioimpedance (BIA): Body composition
Continuous Monitoring
Alerts for:
- High heart rate (customizable threshold)
- Low heart rate
- Irregular rhythm (Samsung phone required)
ECG Readings
On-demand ECG by placing fingers on side button for 30 seconds. Irregular rhythm notifications require Samsung phone.
Tips for Better Accuracy
- Wear snugly, one finger-width above wrist bone
- Keep sensor clean before workouts
- Allow warm-up time before intense exercise
- For maximum precision, pair with Bluetooth chest strap
Bottom Line
Sufficient for general fitness tracking and trend analysis. For competitive training or clinical needs, supplement with a chest strap heart rate monitor.
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How we researched this
Where this comes from: this answer draws on the product's published specifications and the reviews ShopSavvy collected for it, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen Jun 17, 2026.
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