 Screen-printed electrochemical sensors are a cost-effective way to bring electrochemistry from the lab to the field. However, it is important to measure the real electrochemical surface area of the sensor to ensure accuracy and consistency. This paper discusses two methods, cyclic voltammetry and chronicalometry, to determine the real electrochemical surface area of screen-printed electrodes. These techniques require careful consideration of experimental parameters such as scan rate, potential sweep amplitude and temperature. The results obtained from these experiments can then be used to compare different types of screen-printed electrodes and assess their performance. This article was authored by Alejandro Garcia Miranda Ferrari, Christopher W. Foster, Peter J., Kelly and others.