HomeCalculatorsCetane Index - ASTM D4737 (improved)

Cetane Index - ASTM D4737 (improved)

ASTM D4737 improved 4-variable Cetane Index formula (preferred over D976 for regulatory use).

CetaneD4737Distillate
Cetane Index D4737
88.0 -
Formula, assumptions, and limits

Preferred over D976 for regulatory acceptance. ISO 8217 DMA minimum Cetane 40. D4737 accurate to ±3 cetane numbers vs engine CN.

Symbol legend

SymbolMeaningUnitSource
Distillation recovery temperatures°CASTM D86
Density @ 15 °Cg/mlISO 12185