TL:DR; Calculate the percentage of any number out of any number.
Calculate the percentage of any number out of any number.Great little tool to have on hand.
FC-Win (tm) is a front-end program for Fortran Calculus (tm). The Fortran Calculus (FC) language is for math modeling, simulation, and optimization. FC is based on Automatic Differentiation that simplifies computer code to an absolute minimum.
Handy and useful expression calculator and converter with skins and lots of features
XLSTAT is a complete data analysis and statistics add-in for Excel. It includes regression (linear, logistic, nonlinear), multivariate data analysis, parametric tests, non parametric tests, ANOVA, ANCOVA, forecasting methods.