Sample size calculator
How many survey responses do you need?
A quick planning estimate using 95% confidence and the conservative 50% response-distribution assumption. Add a finite population if you know it.
Estimated sample 385
completed responses
Planning estimate, not magic.
This assumes simple random sampling, 95% confidence, and maximum variability (p = 0.5). Non-response, sampling bias, quotas, clustering, tiny subgroups, and the actual analysis you plan to run can require a different target.
Build the survey →