π Statistics & Probability
Margin of Error Calculator
Calculate margin of error for any survey or poll. Free MOE calculator with confidence level options.
How to Use This Calculator
- 1Enter your inputs in the fields above.
- 2Press the Calculate button to see results instantly.
- 3Review the formula and worked example below to verify.
- 4Try different scenarios β your numbers stay private in your browser.
Example Calculation
How It's Calculated
- z: Z-score (standard normal)
- p: Sample proportion / p-value
- n: Number of periods or sample size
Benefits & Use Cases
- Instant results β no spreadsheet required
- Free and unlimited usage, no signup
- Privacy-first: nothing is sent to any server
- Mobile-friendly and works offline once loaded
Frequently Asked Questions
Is this calculator free to use?
Yes β every calculator on GenAlpha Tools is 100% free with no signup required.
Do you store the values I enter?
No. All calculations happen in your browser. Your data never leaves your device.
Can I use this on mobile?
Yes, the calculator is fully responsive and works on phones, tablets, and desktops.
Is the result accurate?
Calculations follow the standard published formula shown below. Results are for educational use; verify with a professional for high-stakes decisions.
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