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Oura Ring 4
Smart Sensing technology that adapts to individual health metrics
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⚡⚡ Specification Summary: Oura Ring 4
⚡ Specification Summary: Oura Ring 4
Oura Ring 4 offers a biometric tracking suite with a $5.99/mo membership. Published specifications list up to 8-day battery life, Fully titanium design or high-performance zirconia ceramic for the Oura Ring 4 Ceramic., and 3g weight.
📋 Key Takeaways:
- ✓Rated Battery Life: Up to 8 days per charge cycle (20-minute full recharge).
- ✓Monthly Subscription: $5.99/month ($564.64 3-year total).
- ✓Durability & Sizing: 100m/328ft water resistance with US 4-15 sizing options.
Smart Sensing technology that adapts to individual health metrics
Order the manufacturer sizing kit prior to ring delivery to verify finger fit.
Advantages & Pros
- ✓Breakthrough sensing technology
- ✓Comfortable fit for continuous wear
- ✓Lightweight design
- ✓Long battery life
Limitations & Cons
- ✕Charging time may vary
- ✕Size limitations for some users
Independent Video Reviews
Oura Ring 4 Review: Best Smart Ring in 2026?
By Digit
Comprehensive breakdown of Oura Ring 4's titanium design and sensor updates.
I Wore the Oura Ring 4 for 1 Year - Here's the Truth
By The Daily Deitz
Details how the ring holds up to scratches, battery wear, and daily life over an extended period.
Form Factor & Resilience
| Materials | Fully titanium design or high-performance zirconia ceramic for the Oura Ring 4 Ceramic. |
| Width / Thickness | 7.9mm wide / 2.88mm thick |
| Weight | 3g |
| Water Resistance | 100m/328ft |
| Size Range | US 4-15 |
| Sizing Kit Offered | ✓ YesOfficial Sizing Protocol → |
Power Architecture
| Battery Life | Up to 8 days |
| Charging Time | 20 minutes |
| Charger Type | N/A |
| Charging Case Included | ✕ No |
Sensor Array & Biometrics
| Built-in Sensors | Red LEDs, Infrared LEDs, Green PPG sensors, Digital temperature sensor, Accelerometer |
| LED Optical Colors | Red, Infrared, Green |
| Stress Tracking | ✓ Yes |
| Cycle Prediction | ✓ Yes |
| Sleep Metrics | Sleep Duration, Sleep Stages, HRV, SpO2 |
Software & Ecosystem
| Companion App | Oura App |
| Supported OS | iOS & Android |
| Apple Health Link | ✓ Yes |
| Google Connect Link | ✓ Yes |
| Offline Storage | Up to 7 days |
| Bluetooth version | Bluetooth Low Energy (Bluetooth Smart®) |
Virtual Sizing Assistant
Convert your finger circumference to a standard US ring size. Smart ring brands may size differently from jewelers, so confirm with the manufacturer's sizing guide or sizing kit before buying.
Your Standard US Ring Size
Smart ring sizes vary by brand and model. Use this as a starting point and confirm your size with the manufacturer's sizing guide or sizing kit before ordering.
Sizing Decision Matrix (24-Hour Sizing Kit Rule)
Learn how to bypass sizing mismatches. Under the 24-Hour Sizing Kit Rule, users must wear a plastic sizing ring for a full day to capture natural biometric swelling cycles.
Do you own or have access to an official vendor sizing kit?
Frequently Asked Questions: Oura Ring 4
Does the Oura Ring 4 require a monthly subscription?
Yes. The Oura Ring 4 has an MSRP of $349 and requires a $5.99/month membership, resulting in a 3-year total cost of $564.64.
How long does the Oura Ring 4 battery last?
Manufacturer specifications rate the Oura Ring 4 for up to 8 days per charge, with a full recharge time of approximately 20 minutes.
What are the Oura Ring 4 dimensions and water resistance?
The Oura Ring 4 weighs 3g, measures 7.9mm wide by 2.88mm thick, is constructed from Fully titanium design or high-performance zirconia ceramic for the Oura Ring 4 Ceramic., and is rated for 100m/328ft.
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