Oura Ring 4 - 30% off
Oura Ring 4 - 30% off
Sleeker, smarter, and made for you
Our new Smart Sensing technology provides enhanced accuracy, deeper personalization, and longer battery life.
Sleek, fully-titanium design and discreet sensors provide 24/7 comfort.
With 5-8 days** of battery life per charge, never miss a beat when it comes to tracking your health.
Oura Membership grows with you
Track over 50 health and wellness metrics, and get personalized insights into your sleep, activity, stress, metabolic, heart health, and women's health. With innovative, AI-powered tools like Oura Advisor, get exclusive access to actionable insights that become increasingly tailored over time.
Frequently Asked Questions
The sensors in the Oura Ring have been tested against laboratory results in multiple validation studies. Wearables differ in where they're worn, the sensors they use, and how they process data. For the most consistent and meaningful insights, it's best to track trends and changes over time within your Oura Ring and Oura App, rather than comparing your Oura results to those from other devices.
Oura Ring is water-resistant up to 100 meters (~330 feet). You can wear it while showering, swimming, or snorkeling, but we don't recommend scuba diving or keeping it submerged for over 12 hours. Chlorine will not damage it.
Operating temperature: -10–52°C / 14–125°F. Safe for showers, hot tubs, saunas, ice baths, and cryotherapy tanks. Extended exposure below -20°C / -4°F or above 60°C / 140°F may damage the battery.
Oura Ring gives a complete picture of your health, including:
- Readiness
- Sleep
- Activity
- Daytime Stress and Resilience
- Heart Health: Cardiovascular Age and Cardio Capacity
- Women's Health: Cycle Insights, Pregnancy Insights, and Menopause Insights
Oura Membership unlocks the full potential of the Oura App, allowing you to access detailed insights and personalized guidance. Without a membership, the Oura Ring can be used only with limited functionality.
We recommend you use an Oura Ring sizing kit before selecting your size. The kit includes plastic ring sizers corresponding to Oura Ring sizes, which differ slightly from standard ring sizes (note: half sizes are not available).
For accuracy, wear the sizing ring for at least 24 hours, including while sleeping. If you're between sizes, choose the smaller size for a more secure fit.
Oura Ring Size Chart
| Oura Size | Inner Circumference (mm) | Inner Diameter (mm) |
|---|---|---|
| 4 | 44.2 | 14.1 |
| 5 | 46.8 | 14.9 |
| 6 | 49.3 | 15.7 |
| 7 | 51.8 | 16.5 |
| 8 | 54.4 | 17.3 |
| 9 | 57.0 | 18.1 |
| 10 | 59.5 | 18.9 |
| 11 | 62.1 | 19.8 |
| 12 | 64.6 | 20.6 |
| 13 | 67.2 | 21.4 |
| 14 | 69.7 | 22.2 |
| 15 | 72.3 | 23.0 |
To measure your finger, wrap a strip of paper around the base of your finger, mark where it overlaps, and measure the length in mm — that's your inner circumference. Match it to the table above.
📦 What's Included
- Oura Ring 4
- Size-specific charger
- USB-C cable
Tech Specifications
❤ Sensors
Red and infrared LEDs measure blood oxygen levels
Green and infrared LEDs alternate to measure heart rate and HRV 24/7 and respiration rate
Digital sensor measures temperature trends
Accelerometer tracks movement and activity 24/7
✓ Compatibility
Available on iOS and Android
Oura App available in English, Finnish, Japanese, German, French, Spanish, Italian, Norwegian, Swedish, Czech, Dutch, and Danish
Supports metric and imperial units
Integrates with 40+ apps
📐 Weight and Dimensions
Width: 7.90mm
Thickness: 2.88mm
Weight: 3.3 to 5.2 grams (depending on ring size)
🔋 Battery Life
5-8 days of battery life**
Typically charges in 20-80 minutes, depending on battery level
◯ Quality Materials
Non-allergenic titanium on inner & outer surfaces
Seamless titanium interior
Water resistant up to 100m/328 ft
📶 Connectivity
Bluetooth Low Energy
Automatic firmware updates via Oura App
EMF-safe | Airplane mode | FCC-certified
**Battery life and longevity depend on Oura Ring size, Oura App settings, feature configuration, activity, battery age, usage, and many other factors; actual results will vary.