Math Calculators Online
Calculate percentages, run scientific functions, and work through statistics without opening a separate app. Fast, accurate, and free.
All tools
Every tool below is free, works instantly, and needs no sign up.
No tools match your search. Try a different keyword.
Related tool categories
Every category on ConvertNow, each one free and updated as new tools launch.
Understanding Math & Numbers
What these tools are for, and how to get the most reliable result from them.
From quick math to full calculations
Some days you need a fast percentage check, other days a full scientific calculation with trigonometry and logarithms. This page covers both ends without switching between apps.
Built for accuracy
Calculations follow standard order of operations and handle floating point numbers carefully, so results match what you would get from a dedicated calculator or spreadsheet formula.
Useful well beyond the classroom
Percentage math shows up in budgeting, discounts and tips. Statistics show up in understanding a data set at work. These tools are built for that everyday use, not just homework.
FAQ: Math Calculators Online
Straight answers to what people ask most about these tools.
Does the scientific calculator use degrees or radians?
You can switch between the two. Check the mode indicator on the tool before running trigonometric functions, since the same input gives very different results in each mode.
How many decimal places does the calculator show?
Results are shown to a sensible number of decimal places for readability, with the option to see more precision where the tool supports it.
What is the difference between mean and median?
Mean is the average of all values added together and divided by the count. Median is the middle value once everything is sorted. Median is often more useful for skewed data, like income, where a few extreme values can distort the mean.
Can the percentage calculator work backward, from result to original number?
Yes, the tool supports finding the original value, the percentage change, and the percentage of a total, not just one direction.
Does the calculator support very large or very small numbers?
Yes, results display in scientific notation automatically when a number is too large or too small to show comfortably in standard form.
Is there a limit to how many numbers I can enter into the statistics calculator?
No fixed limit for typical data sets. Very large data sets are better handled in dedicated statistics software, but everyday sample sizes work fine here.
How to use these tools
The same simple flow works across every tool on this page.
Choose your calculator
Percentage, scientific, or statistics, whichever matches your question.
Enter your numbers
Type in the values you are working with.
Get an instant result
With steps shown where that helps you follow the logic.
Adjust and recalculate
Change any value without starting the calculation over.
Syntax and reference
Formulas, formats and quick references used across this category.
Percentage formula
Percentage = (part / whole) x 100Order of operations
Parentheses, then Exponents, then Multiplication and Division, then Addition and Subtraction.Statistics quick reference
| Mean | The average of all values, added together and divided by the count |
|---|---|
| Median | The middle value once every number is sorted |
| Mode | The value that appears most often |
| Standard deviation | How spread out the values are around the mean |
Built to be trusted, every time
No dark patterns, no forced accounts, and nothing you type is kept longer than it takes to give you an answer.
Nothing you enter is stored
Inputs are used only to generate your result, in that moment.
Free, with no catch
No sign up, no trial period, no hidden paywall on any tool.
Works on any device
Every tool is built to work on desktop, tablet and mobile.