Visual Calculus is an easy-to-use calculus software for teaching and studying limit, derivative function, integral, 3D vector, double integral, triple integral, series, ode etc. It can create 2D, 2.5D and 3D function graphs, animations and table graphs. 2D Features: explicit, implicit, parametric, and in equation; Cartesian and polar coordinate systems; curve and animation; graph of inverse function and derivative function; parity; maximum, minimum, and inflexion; integration; root; the length of curve; tangent and normal; curvature circle; intersection; line plot; scatter plot; stem plot; step plot; curve smoothing; limits; series; odes; vector field. 3D Features: cartesian, cylindrical, and spherical coordinate systems; 3D curve and surface; animation; 3D surface based on table data; surface by rotation; 3D vector and vector operations; tangent and normal of 3D curve and surface; partial derivative functions; material and light. Ability to create color map, contour plot and vector plot. Ability to move, zoom in, zoom out and rotate graphs. Ability to save graphs as text file or bmp file. Ability to save animation as AVI file.