Free Research Tool — H-in-Q
How large should your
research sample be?
Instantly calculate the minimum number of respondents for statistically reliable market research — based on your margin of error, confidence level, and response rate. Built by US market research experts.
Sample Size Calculator
10K
5%
95%
30%
for statistical validity
adjusted for finite population N
Sample size reference table
Common US research configurations — your current selection is highlighted in blue
| Margin of error | Confidence | Min. sample | Invitations (30% RR) | Risk | Typical use case |
|---|
Margin of error
The ± range around your results. At ±5%, if 60% say “yes,” the true answer is between 55–65%. Smaller margin = more invitations needed.
Confidence level
How certain you want to be. At 95%, your results reflect reality 95 times out of 100 if the study were repeated. Industry standard for consumer research.
Why it matters
Too small a sample produces unreliable insights. Too large wastes budget. This calculator finds the statistically optimal number for your research goals.
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