T-Test Calculator: One Sample, Two Sample, Paired and Welch
Calculate one-sample, independent, paired and Welch t-tests from raw data with t, degrees of freedom, p-value, effect size and confidence intervals.
Normal Distribution Calculator: Probability, Z-Scores and Percentiles
Calculate normal-distribution probabilities, z-scores, tails, intervals and inverse percentiles from a mean and standard deviation.
Linear Regression Calculator: Line of Best Fit, Correlation and R²
Calculate a least-squares regression line, Pearson correlation, R², residual error and predictions from paired X and Y data.
Matrix Calculator: Multiply, Inverse, Determinant and Transpose
Calculate 2×2 and 3×3 matrix multiplication, addition, subtraction, determinant, inverse and transpose with checked examples.
System of Equations Calculator: 2×2 and 3×3 Solver
Solve 2×2 and 3×3 linear systems, classify unique, inconsistent or dependent equations, and inspect ranks, RREF, determinant and residual.