Research tools
Calculate with context.
Quick calculations for planning and exploring research data. Data imported here stays in your browser and is not uploaded or saved.
Optional guidance
Choose by research area
Select the area closest to your work to highlight commonly used tools. This guidance is not restrictive: every tool remains visible, and the correct choice depends on your study design and data.
Suggested for this area: View the complete set of free tools. Choose this when your field is interdisciplinary or is not named below.
Tool access
Sample size and the calculator are open to everyone. Sign in to use statistical analyses or upload a research dataset. The catalogue above remains visible so visitors can see what is available for their discipline.
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Data-entry templates
These templates and their instructions are public. The general workbook contains descriptive statistics, frequency and percentage, t test, chi-square, ANOVA, CRD and RCBD sheets. The plant-ecology workbook covers diversity, site similarity, vegetation/IVI and basal area.
For analysis, use unique variable names in the first row and one observation per later row. Native SPSS `.sav` and `.zsav` files are not supported; export the SPSS Data View as `.xlsx` or CSV.
Sample size for one proportion
For a simple random survey estimating one yes/no outcome. Enter the expected prevalence and the margin of error you can accept.
Methods and use
These free tools provide basic exploratory calculations. Check study design, assumptions, missing values, sampling effort, and reporting requirements before using a result in a thesis or publication. Correlation, regression and advanced ecological modelling are not included in this free section.
Methods: CDC Epi Info: survey sample size · NIST: two-sample t test · NIST: one-way ANOVA