Statistics Calculator — Mean, Median, Mode & Std Dev

Introduction

Our free statistics calculator instantly computes mean, median, mode, range, variance and standard deviation for any dataset. Whether you are a student working through homework, a teacher preparing class data, a researcher summarizing survey results, or an analyst sanity-checking a report, this tool turns a raw list of numbers into a complete descriptive summary in seconds. Everything runs directly in your browser — your data never leaves your device, there is no signup, and it is completely free.

How to Use

1. Paste or type your numbers into the input box, separated by commas, spaces or line breaks.
2. Click Calculate for the full summary — mean highlighted at the top, plus median, mode, range, variance and standard deviation.
3. Both sample and population formulas are shown: use the sample version when your data is drawn from a larger group.
4. Try Load a sample dataset to see it in action instantly, or Reset to start over.

Key Features

• Complete descriptive statistics — mean, median, mode, range, variance and standard deviation in one click.
• Sample and population formulas shown side by side, so you always use the right one.
• Flexible input — commas, spaces, semicolons or new lines; decimals and negative numbers supported.
• Clear error messages — invalid entries are flagged instead of silently giving wrong answers.
• 100% client-side — no data is uploaded or stored; works fully offline once the page loads.
• Mobile friendly — responsive layout with dark-mode support for any device.

Why Choose Trencada

Trencada’s calculators are built to be fast, accurate and distraction-free: no accounts, no downloads, no payments. This statistics calculator uses the same standard formulas as spreadsheet software and scientific calculators, presented in a clean summary that is easy to copy into reports and assignments. Whether you need a quick average or a full spread analysis for a research project, it is always here and always free.

Frequently Asked Questions

1. What is the difference between sample and population standard deviation?
Population standard deviation divides by the number of values (n) and describes an entire group; sample standard deviation divides by n−1 to estimate the spread of a larger group from a subset. Our tool shows both so you can pick the correct one.

2. How do I enter my data?
Type or paste numbers separated by commas, spaces, semicolons or line breaks — for example: 12, 15, 18, 21, 21, 24, 30. At least two numbers are needed.

3. Is my data stored or sent anywhere?
No. All calculations happen locally in your browser with JavaScript. Nothing is uploaded, tracked or saved.

4. Is this statistics calculator really free?
Yes — completely free with no signup, no limits and no premium tier. Use it as often as you like.