According to multiple sources, a normal blood oxygen level for adults is between 95% and 100% . A blood oxygen level below 95% is considered low and may put you at risk of hypoxemia, which can lead to serious complications. However, some people with chronic lung disease or sleep apnea can have normal levels around 90% . Its important to note that pulse oximeters are not always accurate, and actual blood saturation levels may be 2% to 4% higher or lower than what the oximeter reads. If you have a health condition that may affect your blood oxygen levels, its best to speak with a doctor to determine the ideal or realistic level for you.