RF match calculator optimizer is a graphic impedance calculator. The program can be used to match sources to loads with networks made with impedances, inductors, capacitors, transmission lines, stubs and transformers. Frequency and components can be trimmed on line and the result is immediately shown. Frequency sweep and Monte Carlo simulation can be used to evaluate the behaviour of the matching network. Autotuning helps the user to find a solution to matching problems. A pop-up calculator for complex numbers is also included.