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Matrix Determinant (2x2 and 3x3) Calculator

Compute determinant of 2x2 and 3x3 square matrices.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Computes determinant via cofactor expansion. A zero determinant indicates a linearly dependent, non-invertible matrix.

How to use it (step by step)

  1. 1Fill in the boxes: “Matrix Dimensions”, “Row 1 elements (comma separated)”, “Row 2 elements (comma separated)”, “Row 3 elements (for 3x3 only)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Matrix
A grid of numbers in rows and columns, used in math, graphics and engineering.
Daily rate factor (261 / 313 / 365)
The number of paid days in a year your company uses to turn a monthly salary into a daily rate: 261 for Mon–Fri, 313 for Mon–Sat, 365 if rest days and holidays are paid too.

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