SplineCalc v4.3.1 Multipurpose scientific calculator designed to perform mathematical operations with maps (grids), data tables, lines, polygons and numbers. You can use arithmetic and logical operations on any combination of the above data. You can define surfaces analytically or load them from a file. You can then calculate first and second partial derivatives, surface area, and volume using contour integration with great accuracy. In addition to arithmetic and logical operations with multi-connected polygons it is possible to do union, inversion and subtraction operations. Any result can be visualized. You can extend SplineCalc with your own functions and variables. All expressions can be saved and loaded from disk as a separate project. SplineCalc is a powerful tool, but very easy to use. Six examples show rich features and high calculation accuracy. This product can be useful in mathematics, physics, geology, geophysics, medicine, ecology and biology. SplineCalc may be of interest to science students or as an additional tool for users of mapping programs such as Surfer.