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Cofactor Matrix Calculator
Cofactor matrix, determinant and inverse for a 2×2 matrix.
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Cofactor matrix
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Cofactor matrix, determinant and inverse for a 2×2 matrix.
Cofactor Matrix Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Cofactor C_ij = (-1)^(i+j) x minor M_ij.
How It Works
Key concepts behind this calculator
1
Enter Values
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2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
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Quick Reference Guide
Cofactor Quick Guide
Typical values for reference.
| Matrix | Determinant | Cofactor | Invertible |
|---|---|---|---|
| [[1,2],[3,4]] | -2 | [[4,-3],[-2,1]] | Yes |
| [[2,5],[1,3]] | 1 | [[3,-1],[-5,2]] | Yes |
| [[4,0],[0,4]] | 16 | [[4,0],[0,4]] | Yes |
| [[1,2],[2,4]] | 0 | [[4,-2],[-2,1]] | No |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Cofactor Matrix Calculator FAQ
Answers to common questions about this calculator.
The matrix of signed minors.
Inverse = transpose of cofactors / determinant.
Cofactor C_ij = (-1)^(i+j) x minor M_ij.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.