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Margin of Error Percentage Calculator
Margin of error from sample size and proportion.
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Margin of error
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Margin of error from sample size and proportion.
Margin of Error Percentage Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: MOE = z sqrt(p(1-p)/n)
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
Margin Quick Guide
Typical values for reference.
| Sample size | Proportion (%) | Z score | Margin of error |
|---|---|---|---|
| 1000 | 50 | 1.96 | 3.10 % |
| 400 | 50 | 1.96 | 4.90 % |
| 3000 | 30 | 1.96 | 1.64 % |
| 100 | 70 | 1.645 | 7.54 % |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Margin of Error Calculator FAQ
Answers to common questions about this calculator.
It uses the formula shown with your inputs. Real conditions vary, so treat it as a guide.
MOE = z sqrt(p(1-p)/n)
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.
Yes. Replace each input with your own figures and the result updates instantly.