Free Online Matrix Calculator

About Matrix Calculator

Matrices are the backbone of linear algebra, appearing everywhere from computer graphics transformations to solving systems of equations to machine learning — but even simple operations like matrix multiplication or finding an inverse involve enough bookkeeping that manual calculation is slow and error-prone, especially for anything larger than 2×2.

This tool supports 2×2, 3×3, and 4×4 matrices and computes addition, subtraction, multiplication, transpose, determinant, and matrix inverse. Determinant and inverse use Gaussian elimination with partial pivoting, a numerically stable technique that works correctly for any invertible matrix of these sizes, verified against standard textbook reference examples.

A matrix's determinant tells you immediately whether it has an inverse at all — a determinant of zero means the matrix is 'singular' and has no inverse, which this tool detects and reports clearly rather than producing a meaningless result. For invertible matrices, the inverse is exactly what's needed to solve systems of linear equations or reverse a transformation.

This is useful for linear algebra coursework and homework verification, computer graphics and game development transformation calculations, checking hand-computed matrix operations, and any application (economics, engineering, computer science) that models relationships as matrices.

How it works

1. Choose a matrix size. 2×2, 3×3, or 4×4.
2. Choose an operation. Add, subtract, multiply, transpose, determinant, or inverse.
3. Enter values and see the result. The result updates automatically as you type.