Key takeaways
- The Oura Ring tracks more than 50 health metrics from LEDs, a temperature sensor and a 3D accelerometer.
- Its 3 daily scores are Sleep, Readiness and Activity, and they are the only data visible without an Oura Membership.
- Heart rate, HRV, stress, Cardiovascular Age, Cardio Capacity and cycle insights all need a membership.
- Oura Ring 5 lasts 6 to 9 days per charge and Oura Ring 4 lasts 5 to 8 days.
The Oura Ring is a smart ring made by the Finnish company Oura that tracks sleep, recovery, activity and heart health from the base of your finger, and Oura says it measures more than 50 health and wellness metrics. This guide covers the sensors that collect the data, the 3 daily scores, every metric group from sleep to women's health, how the ring detects activity, which features need a membership, and how long the battery lasts.
What sensors does the Oura Ring use?
The Oura Ring uses 4 sensor types: green and infrared LEDs for heart rate, red and infrared LEDs for blood oxygen, a digital temperature sensor, and a 3D accelerometer for movement. Oura says the Oura Ring 5 sensor array has 12 optical signal pathways.
| Sensor | Data it collects |
|---|---|
| Green and infrared LEDs | Heart rate, heart rate variability (HRV) and breathing rate |
| Red and infrared LEDs | Blood oxygen (SpO2) and nighttime breathing disturbances |
| Digital temperature sensor | Body temperature changes |
| 3D accelerometer | Daily movement, workouts and sleep stages |
Every metric in the app is built from these readings. Our guide to what a smart ring is explains how the light-based heart rate sensor works.
What are the Oura Ring's 3 daily scores?
The Oura Ring's 3 daily scores are Sleep, Readiness and Activity, each rated from 0 to 100. They are the only data the app shows without an Oura Membership.
- Sleep score. Rates last night's sleep from total sleep time, sleep stages and timing.
- Readiness score. Rates how recovered your body is by comparing last night's HRV, resting heart rate and skin temperature with your normal ranges, along with recent sleep and activity.
- Activity score. Rates daily movement against a goal that adjusts to your Readiness score.
A low Readiness score after a hard workout or a late night is a cue to take it easier. A high one means your body is ready for more.
What health metrics does the Oura Ring track?
The Oura Ring tracks 6 groups of health metrics beyond the daily scores: sleep detail, activity, stress and recovery, heart health, early-warning signals, and women's health. Oura lists all 6 as part of its membership.
| Group | Metrics Oura lists |
|---|---|
| Sleep | Sleep stages, resting heart rate, HRV, nightly trends |
| Activity | Live activity tracking, automatic activity detection, dynamic goals |
| Stress and recovery | Daytime Stress, Cumulative Stress, Resilience |
| Heart health | 24/7 heart rate, Cardiovascular Age, Cardio Capacity (VO2 max) |
| Health Radar | Blood Pressure Signals, Nighttime Breathing, Symptom Radar |
| Women's health | Cycle Insights with period prediction, Fertile Window, Pregnancy and Menopause Insights |
A few terms need defining. HRV is the variation in time between heartbeats; higher values generally mean better recovery. Cardio Capacity is Oura's estimate of VO2 max, the most oxygen your body uses during hard exercise. Cardiovascular Age is Oura's estimate of how your heart health compares with your actual age. Oura also lists blood oxygen sensing, temperature trends and metabolic tools such as meal logging and CGM (continuous glucose monitor) integration.
How does the Oura Ring detect activity?
The Oura Ring detects activity with its 3D accelerometer, which measures the direction and force of your hand's movement, and with its heart rate sensor, which shows how hard your body is working.
Automatic activity detection recognises workouts without you starting them, and live activity tracking shows heart rate during a session. Both need an Oura Membership. The accelerometer also feeds the sleep stage estimate.
Which Oura features need a membership?
Every Oura feature except the 3 daily scores, the battery level and the Explore content needs an Oura Membership, a paid subscription sold monthly or yearly, with the first month free for new members.
That makes the membership essential for most buyers. Without it, you see your Sleep, Readiness and Activity scores but not the sleep stages, heart rate graphs, stress, heart health or cycle data behind them. RingConn and QALO rings show every tracking feature with no subscription, which our best smart rings guide compares side by side.
How long does the Oura Ring battery last?
The Oura Ring 5 battery lasts 6 to 9 days per charge and the Oura Ring 4 lasts 5 to 8 days, depending on ring size and which features are switched on. A full charge takes about 80 minutes.
Oura gives 3 battery tips:
- Start the night with at least 30 percent charge to get Sleep and Readiness scores.
- The battery performs best between 25 and 80 percent.
- The optional charging case holds up to 5 ring charges for travel.
The ring also stores data when your phone is away: up to 7 days on Oura Ring 4 and up to 3 days on Oura Ring 5. Our Oura Ring 4 review covers battery life in daily use, and our Oura Ring size guide explains how to find the right fit for accurate readings.
Common questions
Does the Oura Ring track steps?
Yes. The 3D accelerometer counts daily movement, and the Activity score uses it together with automatic workout detection, which needs an Oura Membership.
Can the Oura Ring detect illness?
It can flag signs. Symptom Radar looks for changes in temperature, heart rate and breathing that can come before you feel unwell, but Oura says the ring is not a medical device and does not diagnose disease.
Is the Oura Ring waterproof?
It is water resistant to 100 m, so it can stay on in the shower and the pool. Oura Ring 5 is IP68 rated, and Oura says to rinse the ring after chlorinated or salt water and dry it before charging.
Writes guides and reviews for ProductHunter.
