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In this research, four different crude oils from Tatarstan oil fields with wide range of API gravities (from 16.6 to 32.5 °API) were used for hydrogen and carbon nuclear magnetic resonance spectroscopy (H NMR and C NMR) determinations. The hydrogen and carbon aromaticity factors were calculated by using the results of H NMR and C NMR spectroscopy results. The results show that the aromaticity factors were high for heavy crude oils. For predicting SARA fractions, the correlations were developed as a function of aromaticity factors. The developed correlations showed high accuracy for predicting SARA fractions for four crude oils. • The hydrogen and carbon aromaticity factors are increasing with increasing crude oil gravity. • The developed correlations showed high accuracy for predicting SARA fractions for four crude oils. • The maximum error was around 9.4% while the minimum was 0.1% for the developed correlations. [ABSTRACT FROM AUTHOR]