SplineCalc is multipurpose scientific calculator for implementation of various mathematical operations with maps (grids), data tables, lines, polygons and numbers. You can use arithmetical and logical operations with any above data types. It is possible to specify some surface with usage analytical expression or to load it from data file of various popular formats. After you can calculate first- and second-order partial derivatives, surface area and volume by contour integration with highest precision. Besides arithmetical and logical operations it is possible to carry out union, inversion and subtraction with multiply connected polygons. Any results can be visualized. SplineCalc has the unlimited ability to extend itself with usage your own functions and variables. All expressions can be stored on and loaded from disk as separate project. SplineCalc is powerful, but it is very easy to use. Sixth samples are included which show ample opportunities and high precision of calculations. This software can be useful in mathematics, physics, geology, geophysics, medicine, ecology and biology. SplineCalc may be interested for hard science students or as additional tool for mapping software users, Surfer for example.