ffee All tools
EN 中文 FR DE

Determinant Calculator

Find the determinant of a 2x2 or 3x3 square matrix with instant results.

Determinant of a matrix

Determinant: —
The determinant is calculated locally in your browser as you type.

How to use the Determinant Calculator

  1. Choose the matrix size, 2x2 or 3x3.
  2. Type each entry of the matrix into the grid.
  3. Read the determinant from the result panel.

Features

Advertisement

More tools

Quadratic Solver Timestamp Converter Scientific Calculator Expression Evaluator Prime Number Checker Prime Factorization Fibonacci Generator Factorial Calculator Permutations and Combinations Matrix Calculator Matrix Inverse Calculator Linear Equation Solver

Frequently Asked Questions

Common questions about the free online determinant calculator.

Choose the matrix size, type in every entry, and the determinant appears instantly as you edit the numbers.
For a 2x2 matrix the determinant is a times d minus b times c, reading the entries row by row from the grid.
A 3x3 determinant expands along the first row: a(ei minus fh) minus b(di minus fg) plus c(dh minus eg).
A determinant of zero means the matrix is singular, so it cannot be inverted and its rows are linearly dependent.
No. Every entry stays in your browser and the determinant is calculated locally on your own device.
Yes. The calculator is responsive and works in any modern browser on a phone, tablet or desktop.
Yes. It is completely free with no account, no sign-up and no limit on how many determinants you work out.
Determinants show whether a matrix is invertible and are used in Cramer's rule, eigenvalues and volume scaling.

Last updated: October 10, 2026