Qualtrics sample size calculator
Use our qualtrics sample size calculator to calculate accurate size and measurement values instantly.
Calculator
Calculate sample size with finite population correction.
Formula: n0 = Z^2 p(1-p)/e^2, n = n0/(1+(n0-1)/N)
What each field means
- Confidence Level (%): Example: 95
- Margin of Error (%): Example: 5
- Estimated Proportion (0-1): Example: 0.5
- Population Size (N): Enter a valid value for this field.
Required Sample Size
Your result will appear here.
About Qualtrics sample size calculator
The Qualtrics sample size calculator helps you estimate sample size and statistics values quickly using consistent assumptions and practical calculation rules.
Formula Explanation
n0 = Z^2 p(1-p)/e^2, n = n0/(1+(n0-1)/N)
Inputs You Need
- Required measurement values relevant to this calculator
- Unit selection: Confidence Level (%), Margin of Error (%), Estimated Proportion (0-1), Population Size (N)
- Optional tolerance, safety, or scenario values if applicable
Step-by-Step Usage
- Enter your known values in the calculator fields.
- Select units and options that match your scenario.
- Click Calculate to generate your output.
- Copy, save, or share the result for later reference.
Example
Run the tool with realistic values from your use case and compare the output against expected ranges for sample size and statistics calculations.
Method Sources
- https://www.calculator.net/sample-size-calculator.html
- https://en.wikipedia.org/wiki/Sample_size_determination
Frequently Asked Questions
Is this Qualtrics sample size calculator accurate?
Yes, when correct inputs and units are provided.
Which units does this calculator support?
This tool is optimized for Confidence Level (%), Margin of Error (%), Estimated Proportion (0-1), Population Size (N).
Can I use this calculator on mobile?
Yes, the form is optimized for touch inputs and smaller screens.