ToolGrid AISurvey Sample Size
Estimate survey sample size for a confidence level and margin of error.
Runs entirely in your browser — your selected files are not uploaded by this tool. Device-provided speech voices may use online services.
About this free survey sample size tool
Estimate survey sample size for a confidence level and margin of error. Calculators answer a defined arithmetic question using the values you supply. Keep units and currencies consistent, choose the correct starting amount and inspect the assumptions before using a result. Estimates do not replace a lender quotation, an official tax rate, a medical assessment or a jurisdiction-specific deadline rule.
A practical example
A concrete example uses margin of error (%): 5; confidence level: 95%; population (0 = very large): 0. The result is Sample size: 385.
Before you rely on the result
Results use floating-point arithmetic and are rounded to six decimal places. Confirm units and required precision before relying on the result. Assumes 50% response proportion and simple random sampling.
Frequently asked questions
Is the survey sample size free to use?
Yes. The Survey Sample Size is free, needs no account and has no usage limit beyond what your device can handle.
Are my files or numbers uploaded anywhere?
No. The Survey Sample Size runs in your browser, so the values and files you enter stay on your device. Close the tab and nothing is kept.
What does the survey sample size do?
Estimate survey sample size for a confidence level and margin of error. Calculators answer a defined arithmetic question using the values you supply. Keep units and currencies consistent, choose the correct starting amount and inspect the assumptions before using a result. Estimates do not replace a lender quotation, an official tax rate, a medical assessment or a jurisdiction-specific deadline rule.
When should I double-check the result?
Results use floating-point arithmetic and are rounded to six decimal places. Confirm units and required precision before relying on the result. Assumes 50% response proportion and simple random sampling.
Can I share my result?
Yes. Use Copy result or Download, and on calculator-style tools use Copy share link to send someone a link that opens with the same inputs filled in.