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Calculate percentages, increases & decreases with quick reference.
Percentage Calculator is a free browser-based tool that helps you calculate percentages, increases & decreases with quick reference. It is part of ToolsMonk's calculators collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.
This tool is especially useful for workflows such as 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. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.
Percentage Calculator is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.
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
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 is a powerful free online tool available on ToolsMonk that helps you calculate percentages, increases & decreases with quick reference. Whether you're a professional, student, or casual user, our percentage calculator provides instant, accurate results right in your browser without requiring any software installation or account creation.
As part of our Calculators collection, this tool is designed with simplicity and power in mind. All processing happens client-side, ensuring your data remains completely private and secure. The tool works seamlessly across all modern browsers on desktop, tablet, and mobile devices.
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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