What this tool does
Estimate a survey sample using Cochran’s formula and finite-population correction. It calculates only from the values you enter and does not use an AI model.
How to use it
- Enter all required values using the labels shown above.
- Select Calculate result to run the formula.
- Review the output and check it against your curriculum or institution’s rules.
Formula
Cochran n₀ = z²p(1−p) ÷ e²; finite correction n = n₀ ÷ [1 + (n₀−1) ÷ N]
Worked example
Use sample values first and compare the displayed result with the method above before entering your own figures.
Assumptions and limitations
Grading scales, rounding and attendance policies differ. Confirm the result using the official rules of your school, college or university.
Frequently asked questions
Does this tool save my information?
Calculator values are not sent to our server. AI prompts are processed for generation and are not stored by this site by default.
Can I rely on the result without checking it?
No. Review formulas, institutional rules and generated materials before using the result.