Split-Half Reliability Calculator
Calculate reliability by correlating two halves of a test
About Split-Half Reliability
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.
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.