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Confusion Matrix Calculator
Compute accuracy, precision, recall and F1 from a confusion matrix.
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Accuracy
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Compute accuracy, precision, recall and F1 from a confusion matrix.
Confusion Matrix Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Accuracy = (TP + TN) / total.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Confusion Quick Guide
Typical values for reference.
| TP | FP | FN | Accuracy |
|---|---|---|---|
| 50 | 10 | 5 | 90.9% |
| 80 | 20 | 20 | 80.0% |
| 10 | 5 | 15 | 98.0% |
| 90 | 2 | 10 | 94.0% |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Confusion Matrix Calculator FAQ
Answers to common questions about this calculator.
A table of true and false positives and negatives for a classifier.
The harmonic mean of precision and recall.
When one class is much rarer than the other.
The share of actual negatives correctly identified.