Survey Sample Size Calculator

Calculate the sample size you need for statistically significant survey results. Free, instant, and accurate.

Population SizeTotal number of people in your target audience

Confidence LevelHow confident you want to be in your results

Margin of Error (%)Acceptable error range (typically 5%)

370

Required Sample Size

responses needed for statistically significant results

Population

10,000

Confidence Level

95%

Margin of Error

±5%

How This is Calculated

Sample Size = (Z² × p × (1-p)) / E²
Where Z = 1.96 (for 95% confidence), p = 0.5 (maximum variability), E = 0.05

Tips for Better Response Rates

• Keep surveys short (under 5 minutes)
• Offer incentives for completion
• Send reminders to non-respondents
• Mobile-optimize your survey
• Explain why their feedback matters

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About This Calculator

This free calculator helps you quickly calculate and understand your metrics. All calculations happen in your browser - we don't store any of your data. Perfect for quick calculations or one-time analysis.