Blood Oxygen Level Chart
Check if your blood oxygen (SpO2) level is normal
Enter your reading
For reference only, not a medical diagnosis. If you feel unwell or your reading is concerning, contact a healthcare professional.
About this reading
Wearables and oximeters give a snapshot; a single reading varies with rest, temperature and movement. Trends over time matter more than one number.
- Measure at rest, warm and still, for the most reliable reading.
- One unusual reading is rarely an emergency, but repeated abnormal values with symptoms should be checked by a doctor.
About this tool
What is Blood Oxygen Level Chart?
Rates your blood oxygen saturation (SpO2) against normal, low and critical ranges.
What is it for?
See whether the SpO2 reading from your watch or oximeter is in the healthy range.
How to read your result
95–100% is normal; 91–94% is mildly low; below 90% may need medical attention.
For reference only, not a medical diagnosis. See a healthcare professional for concerns.
Frequently asked questions
What is a normal blood oxygen level?
For healthy people at sea level, a normal SpO2 is 95–100%. Readings can dip slightly at high altitude.
Is 92 blood oxygen level ok?
92% is mildly low. Re-measure warm and still; if it stays at or below 92% or you feel breathless, contact a doctor.