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Specificity Calculator — result sheet
Calculate specificity, false-positive rate, and the number of actual negative cases from true negatives and false positives.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: specificity = TN/(TN+FP); false-positive rate = FP/(TN+FP).
Specificity asks how many of the actual negative cases were correctly identified. Its complement within the actual-negative group is the false-positive rate.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- True negatives — minimum 0; maximum 1000000000
- False positives — minimum 0; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| True negatives | 180 |
| False positives | 20 |
Specificity: 90%; false-positive rate: 10%; actual negatives: 200.
Assumptions and limits
- Counts are nonnegative whole-number outcomes from the same defined reference set.
- The actual-negative total TN+FP must be greater than zero.
- This metric does not describe prevalence, sensitivity, precision, or a clinical decision by itself.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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