Matrix Calculator | Add, Multiply, Determinant & Inverse
Free online matrix calculator for up to 4x4 matrices. Compute addition, multiplication, determinants, transposes, and inverses with step-by-step cofactor expansion.
Matrix A Coefficients (3 × 3)
Matrix B Coefficients (3 × 3)
Computed Matrix Output
multiply CompletedSolved
302418
846954
13811490
Linear Algebra Workings Log
Compute Cell (1, 1)
C[1, 1] = (1 * 9) + (2 * 6) + (3 * 3) = 30
Compute Cell (1, 2)
C[1, 2] = (1 * 8) + (2 * 5) + (3 * 2) = 24
Compute Cell (1, 3)
C[1, 3] = (1 * 7) + (2 * 4) + (3 * 1) = 18
Compute Cell (2, 1)
C[2, 1] = (4 * 9) + (5 * 6) + (6 * 3) = 84
Compute Cell (2, 2)
C[2, 2] = (4 * 8) + (5 * 5) + (6 * 2) = 69
Compute Cell (2, 3)
C[2, 3] = (4 * 7) + (5 * 4) + (6 * 1) = 54
Compute Cell (3, 1)
C[3, 1] = (7 * 9) + (8 * 6) + (9 * 3) = 138
Compute Cell (3, 2)
C[3, 2] = (7 * 8) + (8 * 5) + (9 * 2) = 114
Compute Cell (3, 3)
C[3, 3] = (7 * 7) + (8 * 4) + (9 * 1) = 90