๐งฎ
Free Math Tools
Percentages, statistics, and number tools
%
Percentage Calculator
Calculate percentages, percentage change, and what percent one number is of another.
๐ฒ
Random Number Generator
Generate random numbers in any range. Single number, list, or unique set โ no repeats.
ฯ
Standard Deviation Calculator
Paste a list of numbers and get mean, median, mode, variance, and standard deviation instantly.
๐
Correlation Calculator
Enter two sets of numbers and calculate Pearson correlation coefficient with interpretation.
๐งช
Sample Size Calculator
Calculate the required sample size for any survey or experiment. Set confidence level and margin of error.
ใ
Mean, Median & Mode Calculator
Enter a list of numbers and calculate mean, median, mode, range, and sum instantly.
Free Math Calculators & Tools
All tools on this page are completely free to use, require no account or signup, and run entirely in your browser. Your data is never sent to a server. Results are instant.
These tools are built for professionals who need quick, accurate answers โ not long explanations. Every calculator shows its formula so you can verify the logic.
How to use these math tools
The math tools cover the everyday calculations people use in analysis, reporting, pricing, survey planning, and data review. They are intentionally plain-English, with formulas visible so users can check the logic.
- Use percentage, statistics, correlation, and sample-size tools for quick checks.
- Read the interpretation notes before relying on a number in a report.
- Pair summary statistics with data-cleaning tools when source data may be messy.