When using a laminar flowmeter for measuring flow rate, the type of gas plays an important role. Calibration of the flow meter for each gas may be economically inconvenient when using a flowmeter for different gases. The aim of this work was to determine whether a simple computational correction could be used to obtain suitable flow rate results for a gas, which is different to the one the flowmeter was calibreted (set) for. Experimental results were obtained by measuring flow rates of nitrogen and oxygen using a laminar flowmeter calibrated for air. The correction that was applied to experimental measurements accounts for the ratio of viscosities of actual and reference gas and is based on Poiseuille Law, gave a sufficiently accurate results, demonstrating the appropriateness of the use of the proposed correction.