What types of charts can I create?

You can create bar charts, line charts, pie charts, scatter plots, histograms, box plots, radar charts, and function plots. Each supports customizable colors, labels, and data series.

Can I download my charts?

Yes, charts can be exported as PNG images or copied to the clipboard. You can also copy the underlying data table for use in other applications.

What statistical tools are available?

We offer descriptive statistics, frequency distribution, Z-score, T-test, chi-square, linear regression, correlation coefficient, moving average, and more.

Are the charts interactive?

Yes, charts are interactive. You can hover over data points to see values, zoom into specific regions, and toggle data series on and off.

Sample Size Calculator

Free online sample size calculator. Required sample size for significance. Visualize data easily.

Sample Size Calculator

Confidence Level

Margin of Error

Population Proportion (default 0.5)

Population Size (optional)

Required Sample Size

385

n₀ = (1.9600² × 0.5 × 0.5) / 0.05²

Z-Score (95%)

1.9600

Unadjusted (n₀)

385

Interpretation

We need 385 respondents for 95% confidence ±5%

Embed this tool

Copy and paste the code below into your website to embed this tool for free. An attribution link to The Util Box is required.

<iframe src="https://www.theutilbox.org/embed/sample-size-calculator" width="600" height="500" frameborder="0" style="border: none; max-width: 100%;" title="Free Sample Size Calculator tool from The Util Box"></iframe>
<!-- Free tool by The Util Box — https://www.theutilbox.org/tools/sample-size-calculator -->
<a href="https://www.theutilbox.org/tools/sample-size-calculator">Sample Size Calculator by The Util Box</a>

Frequently Asked Questions about Sample Size Calculator

What Is Sample Size Calculator?

Free online sample size calculator. Required sample size for significance. Visualize data easily. Whether you need a quick calculation, text transformation, or data conversion, this free online graphs charts tool delivers instant results entirely in your browser — no server uploads, no sign-ups, and no data leaves your device.

How to Use the Free Sample Size Calculator Online

Enter your input — type, paste, or select data in the provided field.
Adjust options — tweak any available settings or parameters to match your needs.
Get instant results — output appears immediately as you type or after clicking a button.
Copy or export — use the copy button to grab the result for use elsewhere.

All processing happens client-side using JavaScript, so your information never leaves your computer. This free online graphs charts tool requires no registration and works on any modern browser.

Why Choose Our Free Sample Size Calculator Tool?

100% free — no hidden premium tiers or usage limits.
Fully private — runs entirely in your browser; no data is sent to any server.
Instant & fast — results appear in milliseconds with zero load times.
Works offline — after the first load, the tool is available without an internet connection.
No sign-up — open the page and start using it immediately.

Sample Size Calculator — Quick Reference

Feature	Details
Category	graphs charts
Processing	100% client-side (browser)
Privacy	No data leaves your device
Cost	Free — no sign-up required
Works Offline	Yes (after first load)