About this tool
Edit two small matrices (2×2 or 3×3), then add them, multiply them, or take the determinant of matrix A. Everything is computed live in your browser with no uploads.
Frequently asked questions
What sizes are supported?
Square matrices of size 2×2 and 3×3. Addition and multiplication use both matrices; the determinant button uses only matrix A.
How is the determinant computed?
For 2×2 it uses ad − bc, and for 3×3 it uses cofactor expansion along the first row — standard exact formulas.