The Advanced Calculations on Curves Toolkit is a software add-on for LabVIEW. This add-on provides four VIs that you can use to perform advanced calculations on curves in an XY graph, where the x-axis data can be nonmonotonic. With the Advanced Calculations on Curves Toolkit, you can calculate crossing points of input curves, split a given curve into functional sections, and return the points of a given curve that corresponds to equidistant levels. You can also use the toolkit to calculate the surface of a given open or closed curve with the sign of the surface depending on the direction of the curve.