Calculator
Percentage Calculator
Calculate percentages: what is X% of Y, X is what % of Y, percentage change, add/subtract percentages.
Your files stay on your device - processed locally via WebAssembly, never uploaded
What is X% of Y?
🔒 All calculations happen in your browser. Nothing is sent anywhere.
Embed this tool on your website
Copy this code to add the Percentage Calculator to your site for free. It runs entirely in your visitors' browsers - no API key, no usage limits.
<iframe src="https://optipix.art/embed/percentage-calculator" width="100%" height="600" style="border:1px solid #e4e4e7;border-radius:8px;" title="Percentage Calculator by OptiPix" loading="lazy"></iframe> <p style="font-size:12px">Free tool by <a href="https://optipix.art/percentage-calculator">OptiPix Percentage Calculator</a></p>
❤️ Love this tool? Support our team.
No ads, no tracking, no limits. Tips keep 104 tools free for everyone.
Secure payment via Stripe · No account needed
About Percentage Calculator
Last updated: May 2026
OptiPix Percentage Calculator handles six common percentage calculations. Find what X% of Y is, determine what percentage X is of Y, calculate the percentage change between two numbers, add or subtract a percentage from a value, and compute the percentage difference between two values. Each mode shows the formula used. The calculation history tracks your last 10 results for easy reference. All math runs locally in your browser with zero server calls.
How It Works
Each calculation mode uses straightforward arithmetic formulas. The tool validates inputs to handle edge cases like division by zero and displays the formula alongside the result for transparency.
Use Cases
- •Calculate discounts and sale prices while shopping
- •Determine tip amounts at restaurants
- •Calculate grade percentages for assignments
- •Compute profit margins for business analysis
- •Track percentage changes in financial data
You Might Also Like
If you find Percentage Calculator useful, check out these related tools: Unit Converter, Tip Calculator, and BMI Calculator. All tools run entirely in your browser with no uploads or signups required.
Explore more: Browse all tools · Step-by-step guides · Tips & tutorials · Compare tools
Frequently Asked Questions
What types of percentage calculations are supported?
How is percentage change calculated?
What is percentage difference?
Is there a calculation history?
Is any data sent to a server?
Related Tools
Unit Converter
Convert between 100+ units across length, weight, temperature, area, volume, speed, data, time, pressure, and energy.
Tip Calculator
Calculate tips, split bills, and compare tip percentages at a glance.
BMI Calculator
Calculate your Body Mass Index with metric or imperial units and a visual BMI scale.
Age Calculator
Calculate your exact age in years, months, days, weeks, and hours from your date of birth.