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.

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Market research analytics dashboard with sample size calculations and data charts

Sample Size Calculator

Your parameters

Population size
10K

500100K1M+

Desired margin of error
5%

1% precise5% standard10% broad

Confidence level
95%

Expected response rate
30%

5% cold outreach30% panel100%

Your results

384

minimum respondents needed
for statistical validity

Invitations to send

1,280

Z-score

1.96

Std deviation

0.50

Risk profile

Medium

Precision index

Standard precision — suitable for most consumer surveys

Cochran formula (finite population correction)

n = (Z² × 0.5 × 0.5) / e²
adjusted for finite population N

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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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How large should your
research sample be?

Sample size reference table

Margin of error

Confidence level

Why it matters

Need custom research?

Oh hi there 👋
It’s nice to meet you.

Sign up to receive awesome blog content in your inbox, every month.

Our AI Solutions

Connect with us

How large should yourresearch sample be?

Sample size reference table

Margin of error

Confidence level

Why it matters

Need custom research?

Oh hi there 👋It’s nice to meet you.

Sign up to receive awesome blog content in your inbox, every month.

How large should your
research sample be?

Oh hi there 👋
It’s nice to meet you.