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This method is a procedure for calculating paraffin, olefin, naphthene and aromatic hydrocarbon types in hydrocarbon fractions, such as reformer feeds and reformates, having endpoints of 200°C or less (C3 through C11). C 12 paraffins and naphthenes at concentrations totaling less than 3% can be determined. Olefins must be less than 2%. C6 minus can be reported either individually or by carbon number. C7 through C12 paraffins and naphthenes are determined by carbon number. Aromatics through C10 can be determined individually or by carbon number with C11 aromatics determined as a composite. Olefins are reported undistributed. Results are reported in mass-percent (mass-%) or liquid volume-percent (LV-%).