Naeem Insights
Discuss Your Requirement
Find a Tool Search or jump to another free utility.
All Tools
Home / Tools / Sample Size Calculator
Free Tool

Sample Size Calculator

Get a transparent starting estimate for a proportion, with optional finite-population correction.

FreeResearch planningFormula-based
Naeem Insights Useful tools. Clear limits. No unnecessary friction.
Use the ToolComplete the fields below and review the result immediately.

Research Planning

Sample Size for a Proportion

Initial estimate—
Adjusted estimate—
Recommended minimum—
This calculator is a planning aid. Cluster designs, design effects, power analyses, expected nonresponse and complex models require additional calculation.
How to use
01Choose confidence and margin of error
02Set the expected proportion
03Calculate the planning estimate
Related topics
sample size calculatorresearch sample sizesurvey sample sizeconfidence level

About This Tool

Sample Size Calculator

The Sample Size Calculator provides a planning estimate from the statistical inputs available in the tool. Sample-size decisions can also depend on design effect, expected prevalence or effect size, attrition, clustering and the planned analysis, so formal research should justify the final choice.