# 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.

> Canonical page: https://elysiatools.com/en/tags/confidence-interval

## Overview

Use Confidence Interval tools to work with confidence interval calculations and related statistical inputs through a browser-based interface, with processing handled on Elysia Tools servers.

## Frequently asked questions

### What can I do with Confidence Interval tools?

You can work with confidence interval calculations and related statistical inputs using the tools in this category.

### Do I need to install software?

No. You can use these tools through your browser without installing software.

### 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.
- [Confidence Interval Calculator](https://elysiatools.com/en/tools/confidence-interval): Calculate confidence intervals for population means using Z or T distributions
- [Confidence Interval Calculator](https://elysiatools.com/en/tools/confidence-interval-calculator): Calculate confidence intervals for a sample mean or proportion using either raw data or summary statistics
- [Monte Carlo Simulation Builder](https://elysiatools.com/en/tools/monte-carlo-simulation-builder): Define input distributions (normal/uniform/lognormal/triangular), write a formula, run thousands of trials, and get the output distribution histogram with confidence intervals.
- [One Sample t Test Calculator](https://elysiatools.com/en/tools/one-sample-t-test-calculator): Run a one-sample t test from raw data or summary statistics, including p-value and confidence interval
- [Pearson Correlation Calculator](https://elysiatools.com/en/tools/pearson-correlation-calculator): Calculate Pearson r, r squared, covariance, and confidence interval for paired numeric data
- [Range Chart Generator](https://elysiatools.com/en/tools/range-chart-generator): Create range charts to visualize min-max value ranges with median markers and outlier detection
- [Standard Deviation Analyzer](https://elysiatools.com/en/tools/standard-deviation-analyzer): Comprehensive standard deviation analysis with variability assessment, confidence intervals, and practical insights
- [Two Proportion Z Test Calculator](https://elysiatools.com/en/tools/two-proportion-z-test-calculator): Compare two independent proportions with a pooled two-proportion Z test and confidence interval

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