How does the Confusion Matrix Calculator work?

4 cells: TP (correct positive), FP (false positive), FN (false negative), TN (correct negative) Then: Accuracy = (TP+TN) / total Then: Sensitivity/Recall = TP/(TP+FN), Specificity = TN/(TN+FP) Then: Precision = TP/(TP+FP).

Can you give an example of how to use the Confusion Matrix Calculator?

Example: Input TP/FP/TN/FN gives a result of Metrics calc.

Is the Confusion Matrix Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Confusion Matrix Calculator?

Our Confusion Matrix Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Confusion Matrix Calculator

Confusion Matrix

Creates confusion matrix showing actual vs. predicted classifications. Basis for evaluation metrics.

Symbol	Name	Unit	Description
TP	TN/(TN+FP)	—	TN/(TN+FP)
TN	TN value	—	Variable used in the calculation

Difficulty:intermediate

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Did You Know?

Confusion matrix extends to multi-class; n×n matrix for n classes.

References

›Confusion Matrix Guide

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Confusion Matrix Calculator

Confusion Matrix

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Confusion Matrix