Oura gives you a daily sleep score based on the quantity and quality of your rest.
Ranging from 0-100%, the sleep score is an overall measure of how well you slept. The score is a weighted sum of Sleep Contributors, which are displayed as horizontal bars in the sleep view.
Oura considers a sleep score of 85% to be very good, and a score above 90% excellent. A sleep score above 85% typically means that all sleep contributors are in balance, and that you meet the typical sleep needs of a person your age.
As sleep needs vary from person to person, it's good to evaluate and interpret your sleep score in relation to your feelings and performance level. Aiming for a perfect score isn't everything: If you feel refreshed in the morning and energetic throughout the day, your sleep score is most likely at a good level.