Split-Half Reliability Calculator

Calculate reliability by correlating two halves of a test

First Half Scores (comma-separated):

Second Half Scores (comma-separated):

Split-half reliability divides a test into two halves and correlates them.

Spearman-Brown: rₛᵦ = 2r / (1 + r) - corrects for test length.

Flanagan-Rulon: Better when halves have unequal variances.

Common splits: Odd-even items, first-second half, random split.