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Calculate percentages, increases & decreases with quick reference.
Loading Percentage Calculator…
Percentage Calculator delivers exactly what its name promises, calculate percentages, increases & decreases with quick reference, fast and free. Because it belongs to ToolsMonk's calculators collection, the whole workflow happens on a single page instead of being spread across separate apps or websites.
Common scenarios include working out a tip, discount, or tax as a percentage of an amount, finding what percentage one number is of another (e.g. a score), and calculating a percentage increase or decrease between two values. The browser-based design means you can switch devices mid-task and pick up right where you left off, whether it's a one-time job or part of a daily workflow.
Everything about Percentage Calculator is tuned for speed to first result, with privacy-friendly processing and the rest of ToolsMonk's tools nearby when the next task comes up.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Calculators |
Choose the type of percentage calculation you need
Enter the two known values
The answer appears instantly
Change the numbers to try another scenario
Calculates 'what is X% of Y', 'X is what percent of Y', and percentage increase/decrease
Covers the everyday percentage questions in one place
Instant results as you type
Clear inputs so you pick the right calculation easily
Runs in your browser, nothing is uploaded
Free, with no signup and no limit on calculations
Working out a tip, discount, or tax as a percentage of an amount
Finding what percentage one number is of another (e.g. a score)
Calculating a percentage increase or decrease between two values
Checking a percent change in price, weight, or any metric
Percentage Calculator was built so that anyone, professional or first-time visitor, gets what the page promises (calculate percentages, increases & decreases with quick reference) in seconds. Results are instant and accurate, and nothing needs to be installed or signed up for along the way.
All processing runs locally in your browser, so your files and data never leave your device. Like every tool in the Calculators collection, it works across all modern browsers on desktop, tablet, and mobile: same features, same results, on every device.
Percentage Calculator answers the everyday percentage questions in one place: what is X% of Y, X is what percent of Y, and the percentage increase or decrease between two values. It removes the small but error-prone mental maths behind tips, discounts, taxes, scores, and price changes.
The core formulas are simple, a part divided by a whole times 100 for 'what percent', and the change divided by the original times 100 for increase/decrease, but they're easy to misapply, especially deciding which number is the base. The calculator makes the right choice obvious by labelling each input.
One genuinely useful insight it helps with: percentage changes aren't symmetric. A 20% increase followed by a 20% decrease doesn't return you to the start, because the decrease applies to the now-larger number (100 → 120 → 96). That asymmetry trips people up constantly in pricing and statistics.
Everything runs in your browser with nothing uploaded. Pair it with the Discount Calculator for shopping and the other ToolsMonk finance tools for loans, salary, and tax calculations.
Remember a percentage increase and the equal decrease don't cancel out, they apply to different bases
For 'X% of Y', just multiply Y by X/100; the calculator saves the mental step but it's handy to know
Double-check which value is the 'whole' when finding what percent one number is of another
Common questions about this tool, its workflow, and what to expect before you use it.
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Try itWriting a roundup or tutorial? Embed the live Percentage Calculator so readers use it right on your page, or drop in a ready-made card that links to it. Free to use, always.
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Calculate percentages, increases & decreases with quick reference.
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