And this is called the integral curvature. No surprise there. And one nice feature of the integral curvature is that it applies even when curvature itself can't be computed at a point because of discontinuities in surface orientation, like edges and corners. But before we talk about that, let's go the other direction. Calculator online for a the surface area of a capsule, cone, conical frustum, cube, cylinder, hemisphere, square pyramid, rectangular prism, triangular prism, sphere, or spherical cap. Calculate the unknown defining side lengths, circumferences, volumes or radii of a various geometric shapes with any 2 known variables. Online calculators and formulas for a surface area and other geometry problems.