ODEcalc (tm) is a Ordinary Differential Equation (ODE) Calculator program for Windows. It solves Linear/Nonlinear ODEs. State your equation, boundary/initial value conditions & it solves your problem. Plots solution y & derivative ydot versus x. Calculus Programming demo application. State your equation, boundary or initial value conditions, & it solves your problem. Plots solution y & derivative ydot versus x. Solves most Boundary Value Problems (BVP) & Initial Value Problems (IVP) for Nth order ODE. ODE may be nonlinear, implicit, and any order. Source code included ... it"s short! Great teaching tool! ODEcalc is another improved productivity example do to using Calculus (level) programming ... ie. minutes to solve, days or years to understand solution and what it implies (e.g. wrong model, sampling rate error, etc.). Helps learn 1) Difference between IVP and BVP; 2) How one can solve most ODEs; and, 3) a start on Parameter Estimation. Hardcopy solution Plots are available. Industry problems with solutions over the past twenty plus years have been put into a textbook to show the power of Calculus (level) Problem-Solving. The textbook is on our website at fortranCalculus.info/textbook/welcome . The software architect behind Calculus Compilers is Joe Thames (read about Joe on our About page). Help improve science and engineering productivity by supporting Joe Thames" MetaCalculus University Rollout efforts, visit metaCalculus.com/campaigns.html, in developing MC Fortran. (There has been little if any corporate funding of Joe"s work for many years!) Help future science & engineers get jobs upon graduation. With MC Fortran, one increases their productivity by a factor of twenty! Please visit our textbook at fortranCalculus.info/textbook/welcome and help support Calculus level compilers at metaCalculus.com/campaigns.html. Thanks!