Post Test Probability Calculator

Post Test Probability Calculator

Input pretest probability without a percentage sign. e.g. input 95% as 95.

Pre-Test Odds = P/(1 – P)

Post-Test Odds = Pre-Test Odds * LR

Post-Test Calculator

Likelihood Ratio Calculator

If you don’t know the LRs then input the sensitivity and specificity without the % sign (e.g 70 for 70%)

LR+ = sensitivity / 1- specificity

LR- = 1- sensitivity / specificity

LR Calculator

An amazing resource for sensitivity and specificity values is here

Also see this calculator