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

Medio

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?

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Encantado de conocerte.

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Nuestras soluciones de IA

Conéctese con nosotros

How large should yourresearch sample be?

Sample size reference table

Margin of error

Confidence level

Why it matters

Need custom research?

Oh hola 👋Encantado de conocerte.

Suscríbase para recibir mensualmente en su buzón de correo electrónico contenidos de blogs increíbles.

How large should your
research sample be?

Oh hola 👋
Encantado de conocerte.