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Table 1 Composite burn index (CBI) and relative differenced normalized burn ratio (RdNBR) values for each severity category.

From: Relating Fire-Caused Change in Forest Structure to Remotely Sensed Estimates of Fire Severity

Severity category CBI Initial RdNBR Extended RdNBR
Unchanged 0.00 to 0.10 <79 <69
Low 0.10 to 1.24 79 to 360 69 to 315
Moderate 4.25 to 2.24 361 to 732 316 to 640
High 2.25 to 3.0 ≥733 ≥641