Free Tools

Calculators for survey research methodology.

Survey Methodology

Sample Size Calculator

Calculate required respondents for your survey.

Margin of Error Calculator

Calculate confidence intervals for your results.

Survey Length Estimator

Estimate completion time by question type.

Response Rate Calculator

Measure survey participation rates.

Psychometrics

Cronbach's Alpha Calculator

Measure internal consistency reliability of scales.

McDonald's Omega Calculator

Coefficient omega (ω) — the modern alternative to alpha.

Cohen's Kappa Calculator

Measure inter-rater reliability between two raters.

Inter-Rater Reliability Calculator

Fleiss' kappa & Krippendorff's alpha for 3+ raters.

Statistical Analysis

Chi-Square Test Calculator

Test association between two categorical variables.