Survey Sample Size
Calculate Survey Sample Size instantly with the exact formula and a worked example.
Survey Sample Size
Population size
Confidence level%
Margin of error%
Expected share of “yes” answers%
Expected response rate%
Responses needed
370
Without finite population correction
385
Invitations to send
1234
z-value
1.96
More about: Survey Sample Size
What it calculates
The “Survey Sample Size” calculator computes Responses needed from 5 parameters: population size, confidence level (%), margin of error (%), expected share of “yes” answers (%), expected response rate (%).
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters Population size = 10,000, Confidence level = 95 %, Margin of error = 5 %, Expected share of “yes” answers = 50 %, Expected response rate = 30 % the result is 370.
How to use
- Enter population size, confidence level, margin of error, expected share of “yes” answers and expected response rate — each field above is adjustable with a slider.
- Responses needed is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Survey Sample Size calculated?
The Survey Sample Size calculator computes Responses needed from population size, confidence level, margin of error, expected share of “yes” answers, expected response rate. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Survey Sample Size calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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