Our online False Positive Calculator helps you quickly determine the number of false positives in any test or screening scenario. Input total individuals, disease prevalence, and test specificity to understand potential errors and make informed decisions about diagnostic accuracy and statistical testing.
Formula:
False Positives (FP) = Total Individuals Tested (N) × (1 - Prevalence (P)) × (1 - Specificity (S))
Where:
- N: Total number of individuals tested.
- P: Prevalence of the condition in the population (as a decimal, e.g., 0.05 for 5%).
- S: Specificity of the test (as a decimal, e.g., 0.95 for 95%).