The CCAI, the Calculated Carbon Aromaticity Index, is a measure of the Fuel Oils Ignition Quality. The value can be calculated using the following, ISO 8217 Ann.C, formula: CCAI = D-81-141 Log10 Log10( VK+0. 85)-483 Log10((T+273)/323) where D = density (kg/m³) at 15°C VK = kinematic viscosity (mm²/s) at temperature T (°C) The CCAI-calculation can easily be carried out by means of The FUEL OIL Calculation Program.