Oura Ring 4 Ceramic

The world's smallest smart ring

Colors

Midnight — $399.00

Select a size

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Free sizing kit ✓
Select a size

Select a size

The product sizing is unique with respect to the American standard.

Not sure what size you are? You can go back and select the free sizing kit option.

Get a free sizing kit with your order and size at home.

*Choosing the right Oura Ring size is essential for comfort and accurate readings.

Get a free sizing kit with your order and size at home.

Select the 'Free Sizing Kit' option when you order your Oura Ring.

Most orders are processed and delivered within 3 days.

Test the sample rings on your preferred finger.

Confirm your size and we will ship your Oura Ring to you.

*Choosing the right Oura Ring size is essential for comfort and accurate readings.

Pay twelve months in advance and forget about it

Subscription

The subscription will start when the trial period or current subscription ends.

Pay twelve months in advance and forget about it

  • The most popular option
  • Great for gifting to friends and family
  • Forget about monthly fees

The subscription will start when the trial period or current subscription ends.

Big changes start small

  • Ultra-thin and 40% smaller than Oura Ring 4. Designed to wear like jewelry. Made to move with you...

    Ultra-thin and 40% smaller than Oura Ring 4. Designed to wear like jewelry. Made to move with you, every day.

  • Track 50+ health metricswith research-grade accuracy for a clearer view of your holistic health a...

    Track 50+ health metricswith research-grade accuracy for a clearer view of your holistic health and wellbeing.

  • 6-9 days* of battery life. A rebuilt battery and tuned firmware make the smallest Oura Ring the l...

    6-9 days* of battery life. A rebuilt battery and tuned firmware make the smallest Oura Ring the longest-lasting yet.

Experience the science of self-care

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.

Heart health

Sleep and rest

Activity and movement

Stress

Metabolic health

Metabolic health

Experience the science of self-care

Frequently asked questions

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What's Included

  • Oura Ring 4 Ceramic
  • Size-specific charger
  • USB-C cable
  • Ceramic Polishing Pad

Tech Specifications

Sensors

  • Red and infrared LEDs measure blood oxygen levels
  • Green and infrared LEDs alternate to measure heart rate and heart rate variability 24/7 and respiration rate
  • Digital sensor measures temperature trends
  • Accelerometer tracks movement and activity 24/7

Compatibility

  • Oura App is available in English, Finnish, Japanese, German, French, Spanish, Italian, Norwegian, Swedish, Czech, Dutch, and Danish
  • Supports metric and imperial units of measurement
  • Integrates with 40+ apps
  • Available on iOS and Android

Weight and Dimensions

  • Width: 7.9 mm
  • Thickness: 3.51 mm (similar to a wedding band)
  • Weight: 5.1 - 8.1 g (depending on ring size)

Battery Life

  • 5-8 days of battery life**
  • Typically charges in 20-80 minutes, depending on battery level

Quality Materials

  • High-performance zirconia ceramic exterior
  • Seamless titanium interior
  • Water resistant up to 100m/328 ft
  • Minor scratches from regular wear are normal
  • Erasable scuffs may occur while handling metal objects

Connectivity

  • Bluetooth Low Energy
  • Automatic firmware updates via Oura App
  • EMF-safe
  • Supports airplane mode
  • FCC-certified