The temperature gauge with quick response characteristic and ability to provide highly precise instantaneous temperature data is usually selected for the systems with minimal time available for the measurement. Thin-film gauges are best suited for such transient measurement. In this paper, the convective environment created by blower-heater arrangement is used to evaluate the dynamic response of platinum thin-film as a heat flux gauge. The in-house fabrication of the gauge is made by using quartz as a substrate and a thin-film of pure platinum acting as a sensing element. The response is measured to the step changes for the enforced convective heat flux. The heat flux value is inferred from transient temperature data from one-dimensional heat conduction model subjected to a semi-infinite body. Numerical analysis is also performed. The similarities of experimental and numerical results authenticate the experimental set up as well as the thin film gauge efficacy.