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Virtual instrumentation is defined as the combination of measurement and control the hardware and software with industry-standard computer technology to create user-defined instrumentation systems. In this paper, the two-input fuzzy logic controller (FLC) for buck boost converter output-voltage regulation is proposed by using LabVIEW. Here the output voltage has been used as a closed loop feedback to determine the output error (e) and the change in error (Δe) as two inputs to the controller. The elements of the buck boost converter as inductance and capacitor have been selected to insure continuous operating mode (CCM) and low output voltage ripple. The experimental results show that the FLC has a good output voltage response compared with PID controller response. This research has successfully showed that LabVIEW and Fuzzy Logic controller can be applied to develop a system for selecting the modes of controller.