StatCalc was designed for high school and college students taking statistics courses and for researchers and managers who need a handy desktop statistics calculator. It serves as an instructional aid and easy to use tool for estimating basic statistics and practicing hypothesis testing. StatCalc calculates descriptive and inferential statistics, graphs distributions, and has a tutorial and context sensitive statistics handbook with definitions, formulas, and practice exercises. StatCalc estimates margins of error, standardized scores, and diagnostic accuracy. Enter and save data for a single variable and calculate descriptive statistics. Estimate sample sizes with two power analysis options. Calculate t-tests, ANOVA, z-tests, chi-square, correlation, and bivariate regression. Graph histograms for continuous data and scattergrams for correlation module. Includes sample data files, ability to import and export ASCII data files, and an Adobe pdf version of the Research Methods Handbook.