Determinant Calculator — 2x2 up to 4x4
Compute determinants and inverses of small matrices
How to Use Determinant Calculator
Compute determinants and inverses of small matrices No signup, and nothing gets uploaded for most use.
- 1
Enter your numbers in the input fields.
- 2
Choose the calculation options or frequency.
- 3
The result updates instantly as you type.
- 4
Review the breakdown, chart, or schedule, and copy the answer.
Why you might like it
- Nothing to upload — the work happens on your device.
- Free with no signup, no watermarks, and no daily limits.
- Works in any modern browser on any device — nothing to install.
- Usually done in a few seconds, so it doesn't get in your way.
Frequently Asked Questions
What is a determinant?▾
The determinant is a scalar value computed from a square matrix. For 2×2 matrices it is ad − bc. It tells you whether a matrix is invertible: a zero determinant means the matrix is singular.
When is a matrix not invertible?▾
A square matrix has no inverse when its determinant is zero. Such matrices are called singular — their rows or columns are linearly dependent, and they collapse space rather than being a reversible transformation.
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