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.

Cohen's Kappa Calculator

Measure inter-rater reliability between two raters.