Matrix Calculator
Work with 2x2 and 3x3 matrices: add, multiply, compute determinants and invert — all in one page with editable grids and instant results.
The four operations
Addition adds matching cells. Multiplication uses the row-by-column rule (A rows times B columns). The determinant is a single number summarizing the matrix — zero means no inverse exists. The inverse is the matrix that undoes the original, computed via the adjugate divided by the determinant.
How to use it
Pick an operation tab and a size, type numbers into the grids (decimals allowed), and hit Calculate. Addition and multiplication need both Matrix A and B; determinant and inverse use A only. Singular matrices report a clear error instead of a wrong answer.