# Sample Size

Browse 6 online sample size tools for working with sample size calculations and related tasks in your browser.

> Canonical page: https://elysiatools.com/en/tags/sample-size

## Overview

Explore 6 Sample Size tools for working with sample size tasks through a browser-based interface, with no software installation required.

## Frequently asked questions

### What can I do with Sample Size tools?

You can use the available tools to work with sample size tasks through the browser interface.

### Do I need to install software?

No. Sample Size tools are available online and can be used through your browser.

### How is my data handled?

Processing runs on Elysia Tools servers. Text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

## Tools

- [A/B Test Significance Calculator](https://elysiatools.com/en/tools/ab-test-significance-calculator): Compute conversion-rate or mean differences, 95%/99% confidence intervals, two-sided p-values (Z-test for proportions, Welch t for continuous metrics), lift, sample size for 80%/90% power, recommended experiment days, plus sequential-testing and Bonferroni multiple-comparison warnings.
- [Adjusted R-Squared Calculator](https://elysiatools.com/en/tools/adjusted-r-squared-calculator): Calculate adjusted R squared from R squared, sample size, and predictor count
- [Central Limit Theorem Demonstrator](https://elysiatools.com/en/tools/central-limit-theorem-demonstrator): See the Central Limit Theorem in action: draw samples from a non-normal source distribution (uniform, exponential, Poisson, or Bernoulli), plot the histogram of sample means, and overlay the predicted Normal curve N(μ, σ²/n). Compare empirical vs theoretical mean and standard error, and watch convergence tighten as the sample size grows.
- [Margin of Error Calculator](https://elysiatools.com/en/tools/margin-of-error-calculator): Calculate the margin of error for a mean or proportion from sample size, confidence level, and variability
- [Sample Size Calculator](https://elysiatools.com/en/tools/sample-size-calculator): Estimate required sample size for proportions or means using confidence level, margin of error, and optional finite population correction
- [Statistical Power Calculator](https://elysiatools.com/en/tools/statistical-power-calculator): Estimate statistical power for one-sample mean or proportion tests using sample size, alpha, and expected effect

## Related content

- [Size](https://elysiatools.com/en/tags/size): Browse 88 online Size tools for working with size-related formats and operations. Use them in your browser with server-side processing.
- [Math](https://elysiatools.com/en/tags/math): Browse 502 online math tools for working with math operations, data, and files in your browser. Text inputs are not stored, and uploaded files are deleted after 6 hours.
- [Confidence Level](https://elysiatools.com/en/tags/confidence-level): Browse 3 online confidence level tools for working with confidence level data in your browser. Text inputs are not stored, and uploaded files are deleted after 6 hours.
- [Margin of Error](https://elysiatools.com/en/tags/margin-of-error): Browse 4 online margin of error tools for working with margin of error data in your browser. Processing runs on Elysia Tools servers; text inputs are not stored and uploaded files are deleted after 6 hours.
- [Power](https://elysiatools.com/en/tags/power): Browse 36 online Power tools for working with power-related formats and operations in your browser. Text inputs are not stored, and uploaded files are deleted after 6 hours.
- [Confidence Interval](https://elysiatools.com/en/tags/confidence-interval): Browse 9 online confidence interval tools for working with statistical interval calculations in your browser. Text inputs are not stored, and uploaded files are deleted after 6 hours.