# How to Calculate Propane Gas Line Sizes?

To calculate propane gas line sizes, divide the rate of volumetric flow needed by the propane's pressure drop. Multiply the line's length by propane's viscosity and the resulting figure. Multiply this answer by a conversion constant which is 8 and then divide the answer by pi. Raise the result to the power of 0.25 and the final result will be the propane line's radius, in meters. You can get line sizing chart for propane gas on websites like mchsi, firelogs and propane-generators.