Percentage Calculator
Calculate percentages easily. Find X% of Y, percentage change, increase/decrease, and more.
What is X% of Y?
Example: What is 20% of 150? = 30
Quick Reference
- What is X% of Y: Multiply Y by (X ÷ 100)
- X is what % of Y: Divide X by Y, then multiply by 100
- Percentage Change: ((New - Old) ÷ Old) × 100
- Add/Subtract %: Calculate X% of number, then add or subtract
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Everything You Need to Know
Complete guide, features, use cases, and frequently asked questions
What is a Percentage Calculator? Complete Guide
A percentage calculator is a versatile mathematical tool that helps you perform various percentage-related calculations instantly. Our 2026 percentage calculator goes beyond basic tools with four distinct calculation modes covering all common percentage use cases. Whether you need to calculate discounts, tax amounts, percentage increases or decreases, or determine what percentage one number is of another, this tool provides accurate real-time results. Perfect for students, professionals, shoppers, and anyone who needs quick percentage calculations with no installation required.
How to Use the Percentage Calculator
- Select your calculation mode from the available options
- For "What is X% of Y?" - Enter the percentage and the number
- For "X is what % of Y?" - Enter both numbers to find the percentage
- For "Percentage Change" - Enter original and new values
- For "Add/Subtract %" - Enter the number, percentage, and choose operation
- View instant results as you type
- Results update automatically with each change
- Use the calculated values for your specific needs
Key Features
4 Calculation Modes
What is X% of Y, X is what % of Y, Percentage Change, and Add/Subtract percentage - covering all common percentage calculations.
Real-time Results
Instant calculations as you type with automatic updates - no need to click calculate buttons.
Easy Mode Switching
Quickly change between calculation types with clear mode selection and intuitive interface.
Decimal Precision
Accurate results with proper decimal handling for precise percentage calculations.
Clean Interface
Intuitive design for effortless calculations - simple inputs with clear labels and results.
No Registration
Free to use without sign-up, downloads, or installations - works instantly in your browser.
Common Use Cases
Shopping
Calculate discounts and sale prices to find actual savings and compare deals.
Finance
Determine tax amounts, interest rates, and financial percentages for budgeting.
Business
Analyze profit margins, revenue growth rates, and business metrics.
Education
Solve math homework problems and understand percentage concepts.
Analytics
Calculate percentage changes in data, metrics, and performance indicators.
Cooking
Adjust recipe quantities by percentage for scaling up or down.
Why Choose Our Percentage Calculator?
- ✓Multiple modes covering all common percentage calculations
- ✓Real-time results that update as you type
- ✓Clean, distraction-free interface
- ✓Works on all devices - desktop, tablet, and mobile
- ✓No installation or downloads required
- ✓Completely free with no hidden costs
- ✓Privacy-focused - all calculations happen in your browser
- ✓Fast and accurate mathematical computations
- ✓Easy to understand results with clear labels
- ✓Perfect for quick calculations on the go
Percentage Calculator Comparison - How We Compare to Competitors
| Feature | 10xTools Percentage Calculator | Calculator.net Percentage | Omni Percentage Calc | RapidTables | Math.com Percentage | PercentageCalculator.net |
|---|---|---|---|---|---|---|
| Price (Free Forever) | ✅ 100% Free | ✅ Free | ✅ Free | ✅ Free | ✅ Free | ✅ Free |
| 4 Calculation Modes | ✅ 4 Modes | ❌ 2 Modes | ✅ 4 Modes | ❌ 1 Mode | ❌ 2 Modes | ✅ 3 Modes |
| Real-time Results | ✅ Instant | ✅ Instant | ✅ Instant | ✅ Instant | ✅ Instant | ✅ Instant |
| No Ads | ✅ No Ads | ❌ Has Ads | ❌ Has Ads | ❌ Has Ads | ❌ Has Ads | ❌ Has Ads |
| No Registration | ✅ No Signup | ✅ No Signup | ✅ No Signup | ✅ No Signup | ✅ No Signup | ✅ No Signup |
| Mobile Friendly | ✅ Mobile Ready | ✅ Mobile Ready | ✅ Mobile Ready | ❌ Desktop Only | ❌ Desktop Only | ✅ Mobile Ready |
| Privacy (Client-Side) | ✅ 100% Private | ✅ 100% Private | ✅ 100% Private | ✅ 100% Private | ✅ 100% Private | ✅ 100% Private |
| Decimal Precision | ✅ High Precision | ✅ High Precision | ✅ High Precision | ✅ High Precision | ✅ High Precision | ✅ High Precision |
| Easy Mode Switch | ✅ One-Click | ✅ Easy | ❌ Complex | ❌ Manual | ❌ Manual | ✅ Easy |
| Unlimited Usage | ✅ Unlimited | ✅ Unlimited | ✅ Unlimited | ✅ Unlimited | ✅ Unlimited | ✅ Unlimited |
✅ = Feature Available | ❌ = Not Available or Limited
Frequently Asked Questions
How do I calculate what is 20% of 150?
Select "What is X% of Y?" mode, enter 20 as the percentage and 150 as the number. The result will show 30.
How do I find what percentage 30 is of 150?
Select "X is what % of Y?" mode, enter 30 as the first number and 150 as the second. The result will show 20%.
How do I calculate percentage increase?
Select "Percentage Change" mode, enter the original value and the new value. A positive result indicates an increase, negative indicates a decrease.
Can I add a percentage to a number?
Yes! Select "Add/Subtract %" mode, enter your number and percentage, and choose "Add" operation. For example, adding 20% to 100 gives 120.
Is the percentage calculator accurate?
Yes, our calculator uses precise mathematical formulas and handles decimal places correctly for accurate results.
Do I need to install anything?
No, the calculator works entirely in your web browser. No downloads or installations required.
Can I use this for business calculations?
Absolutely! It's perfect for calculating profit margins, discounts, tax amounts, and growth rates.
Does it work on mobile devices?
Yes, the calculator is fully responsive and works perfectly on smartphones and tablets.
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