calculatorsonline.co.uk
Sample Size Proportion Calculator
Sample size needed to estimate a proportion.
chart Free Online Tool
โก Instant Results
๐ Clear Comparison
๐ 100% Free Tool
Sample size
Compare Your Options And Get Clear Answers
Sample size needed to estimate a proportion.
Sample Size Proportion Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: n = z2 p(1-p)/E2.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Sample Quick Guide
Typical values for reference.
| z | p | Error | n |
|---|---|---|---|
| 1.96 | 0.5 | 0.05 | 385 |
| 1.96 | 0.5 | 0.03 | 1068 |
| 2.58 | 0.5 | 0.05 | 666 |
| 1.96 | 0.2 | 0.05 | 246 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Sample Size Proportion Calculator FAQ
Answers to common questions about this calculator.
Formula.
It gives a quick estimate of sample size proportion from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.