This section contains 9 free math calculators across 1 category. The Percentage Calculator hub covers basic percentages, increases, decreases, and comparisons. Dedicated tools handle percentage increase, decrease, change, difference, average, fraction-to-percent, decimal-to-percent, and percentage-of-a-percentage — each with worked examples and formula explanations.
All math tools
Every tool is free, runs entirely in your browser, and produces results as you type. No button press, no registration, no data sent to any server.
Which tool to use
| Your goal | Tool |
|---|---|
| Find X% of a number, or work out increase/decrease/what % | Percentage Calculator |
| Calculate how much a value has grown | Percentage Increase |
| Calculate how much a value has fallen | Percentage Decrease |
| Signed change with direction (increase or decrease) | Percentage Change |
| Compare two independent values, no fixed starting point | Percentage Difference |
| Average of multiple percentages | Average Percentage |
| Convert a fraction to a percentage | Fraction to Percent |
| Convert a decimal to a percentage | Decimal to Percent |
| P% of Q% — stacked or successive percentages | Percentage of a Percentage |
FAQs
Are these math calculators free?
Yes, completely free. No registration, no usage limits, no premium tier. Every tool runs entirely in your browser.
Do the calculators work on mobile?
Yes. Every tool is fully responsive and works on any phone, tablet, or desktop without an app.
What is the difference between percentage change and percentage difference?
Percentage change has a direction and a known starting point — the original value is always the denominator. Percentage difference is symmetric — it uses the average of the two values as the base and produces an unsigned result. Use percentage change for before-and-after comparisons; use percentage difference when comparing two independent figures with no defined reference point.