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Youden's J Index Calculator — result sheet
Calculate Youden's J from sensitivity and specificity for a binary classification threshold.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Youden J=sensitivity+specificity−1; displayed percentage form=sensitivity%+specificity%−100%.
J summarizes threshold discrimination by combining true-positive and true-negative rates while keeping the two inputs visible.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Sensitivity — %; minimum 0; maximum 100
- Specificity — %; minimum 0; maximum 100
Worked example
| Input | Value |
|---|---|
| Sensitivity | 90 |
| Specificity | 85 |
Youden J = 0.75, or 75 percentage points.
Assumptions and limits
- Sensitivity and specificity are measured on a defined reference population and threshold.
- The index is descriptive and does not include prevalence, costs, or predictive values.
- Clinical, safety, diagnostic, or deployment decisions require domain validation.
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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