How many survey responses do I need for 95% confidence?

For 95% confidence and ±5% margin of error: ~385 responses for large populations (10,000+). For ±3% margin: ~1,067. For ±2% margin: ~2,401. For smaller populations use our calculator with population size correction.

Survey Sample Size Calculator | How Many Responses Need

You need51 108users in total for the test (Variant A + Variant B).

Survey sample size depends on: Population size (total people you could survey), Confidence level (typically 95%), Margin of error (typically ±5%). Rule of thumb: for populations over 20,000, the sample size plateaus — you need ~385 responses for 95% confidence at ±5% regardless of whether your population is 50,000 or 1 million. For smaller populations (under 1,000), use our finite population correction. For NPS surveys, aim for at least 200 responses per segment for reliable segment comparison.

You need51 108users in total for the test (Variant A + Variant B).

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