🧮 Free tool
Sample Size Calculator
Type your population (if you know it) and choose your confidence level. Results update as you type.
Total number of people in your target group.
Use 0.5 if you don’t know — it gives the safest (largest) sample.
How many questionnaires you expect back. Used to plan how many to distribute.
✍️ Sentence for Chapter 3
Learn the formulas: How to calculate sample size.
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