Survey Planning ・ Free native tool

Sample Size Calculator

Based on the confidence level, allowable error, estimated proportion and limited matrix correction, estimate the number of samples required for the proportional survey.

No uploadsMobile-friendlyTheme support

What is the proportional survey sample size calculator?

Based on the confidence level, allowable error, estimated proportion and limited matrix correction, estimate the number of samples required for the proportional survey. ToolHub places the core computing entirely within the browser, allowing immediate use on both desktop and mobile devices, without the need to register an account or send content to the backend.

How to use this tool?

  1. Enter the data according to the field prompts and select the required processing method.
  2. Click "Process Now" to view the results, indicator summary and necessary error messages.
  3. After confirming that the content meets actual needs, you can copy the results or download them into files for further use.

Suitable use cases

Questionnaire planning, poll sampling and quality spot check design. All processing is completed in the current page, which is especially suitable for workflows that do not want to post internal data to remote services.

Interpretation of results and precautions

This formula assumes simple random sampling, and a stratified or clustered design requires the inclusion of design effects. Tools will validate basic input formats and provide readable error messages, but production environments should still be reconfirmed against source specifications, business rules, or professional requirements.

Browser and device support

We recommend using the latest version of Chrome, Edge, Firefox, or Safari. The page supports dark, light and other website themes, and adjusts the fields and results layout for mobile, tablet and desktop widths.

Frequently Asked Questions

Will the proportional survey sample size calculator upload data to the server?
No. Tool functions are executed directly within the current browser tab, and input and generated results will not be uploaded or saved by ToolHub.
In which use cases is the proportional survey sample size calculator suitable?
Questionnaire planning, poll sampling and quality spot check design
Do I need to install software before using the proportional survey sample size calculator?
No need. Use a desktop or mobile browser that supports modern JavaScript, and no account is required.
What are the limitations of this tool?
This formula assumes simple random sampling, and a stratified or clustered design requires the inclusion of design effects.
Is manual inspection required after the results are generated?
Needed. Tools can assist with calculations, conversions, or formatting, but before going online, importing data, or making business decisions, the results should still be reviewed according to actual specifications.