Blood Oxygen / SpO2 Calculator
SpO2 Level Assessment
Assess your pulse oximetry reading and understand what it means
%
bpm
Supplemental Oxygen Estimator
Estimate supplemental oxygen flow rate to achieve target SpO2
%
Formula
Normal SpO2: 95-100% | Mild Hypoxemia: 91-94% | Moderate: 86-90% | Severe: <86% | COPD Target: 88-92% | Nasal Cannula FiO2 = 21% + (4% x flow rate L/min)
Frequently Asked Questions
What is a normal blood oxygen level?
Normal SpO2 for healthy individuals is 95-100%. Levels of 90-94% indicate mild hypoxemia. Below 90% is considered significant hypoxemia requiring medical attention. For COPD patients, a target of 88-92% is often recommended.
How accurate are home pulse oximeters?
FDA-cleared home pulse oximeters are typically accurate within +/- 2% for readings above 80%. Accuracy can be affected by dark skin pigmentation, cold or poor circulation, nail polish, artificial nails, and excessive movement. Always consider symptoms alongside readings.
When should I go to the ER based on my oxygen level?
Seek emergency care if SpO2 is below 90% (or below 85% for COPD patients), or if you have difficulty breathing, chest pain, confusion, or bluish lips/fingertips regardless of the oximeter reading. Trust your symptoms over the device reading.
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