Percentage Calculator
A versatile percentage calculator — find X% of Y, what percent X is of Y, or calculate percentage change.
A versatile percentage calculator — find X% of Y, what percent X is of Y, or calculate percentage change.
How to use Percentage Calculator
- 1
Pick the calculation mode.
- 2
Enter your numbers.
- 3
Read the instant result.
Real examples of Percentage Calculator in action
Mode: X% of Y; X=15, Y=80
12 (formula: 80 x 0.15)
Mode: X is what % of Y; X=25, Y=200
12.5% (formula: 25/200 x 100)
Mode: percentage change; from=150, to=180
+20% growth (formula: (180-150)/150 x 100)
Who is Percentage Calculator for?
Shoppers calculating tip amounts and sale percentages at checkout
Students checking grade percentages and weighted averages
Small business owners computing commission splits or profit margin percentages
Analysts calculating period-over-period growth rates for reports
Tax filers figuring out what percentage various expenses represent of total income
Why use Percentage Calculator?
- Three modes in one tool.
- Shows the formula used.
- Works with decimals and negatives.
Common use cases
- Calculate a tip or discount.
- Figure out percentage growth between two numbers.
- Compute a tax amount.
How Percentage Calculator keeps your data private
All math runs in your browser's JavaScript engine — no numbers are transmitted, no calculations are logged. This matters when you're running what-if scenarios on salary negotiations, commission structures, or sensitive business margins: the values stay entirely on your device.
How Percentage Calculator compares to alternatives
Honest comparison to other popular options — pick the right tool for the job.
| Tool | Main limitation |
|---|---|
| CalculatorSoup | Ad-saturated page with slow load and tracker-heavy analytics |
| Google's built-in calculator | Query-based — your percentage math appears in Google's search history |
| Smartphone calculator app | No specialized percentage modes, you have to do formulas manually |
| Percentage Calculator | Free, runs in your browser, no sign-up, no watermarks, no file-size limits beyond your device memory. |
Limitations & things to know
- Uses JavaScript floating point — results may have tiny rounding differences for very large numbers
- Currency-specific percentage calculations should use a financial calculator
About Percentage Calculator
Percentage math shows up everywhere — discounts, tips, taxes, growth rates, and grades. Xevon Tools' Percentage Calculator combines the three most common percentage questions into one tool: 'What is X% of Y?', 'X is what percent of Y?', and 'What is the percentage change from X to Y?'. Each mode shows the formula so you can learn and verify as you go.
Frequently asked questions
Helpful tutorials
Practical guides that show real workflows for this tool and related tasks.
Your files never leave your device
Every tool on Xevon Tools runs 100% in your browser. No uploads, no servers, no tracking. Free forever.
Embed Percentage Calculator on your site
Add this tool to your own website, blog, or internal tool page with one line of code. Free to use, no attribution required (but appreciated).
<iframe src="https://www.xevontools.com/embed/percentage-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px;" title="Percentage Calculator — Xevon Tools"></iframe>