Percentage Calculator is a 100% free, browser-based utility that enables you to x% of y, percentage change, increase and decrease. Unlike traditional cloud converters, all processing executes locally on your device with zero server uploads, delivering immediate results and ironclad data privacy.
About the Percentage Calculator
Four everyday percentage calculations on one page, each updating as you type. "What is X% of Y" multiplies Y by X/100. "X is what percent of Y" divides X by Y and multiplies by 100. Percentage change is (new − old) ÷ |old| × 100, and adding or removing a percentage multiplies the value by (1 ± X/100).
Use it for discounts and tips, exam scores, price rises, growth rates, salary increases and statistics homework.
How to use the Percentage Calculator
- Pick the calculator that matches your question.
- Fill in the two values.
- The answer appears instantly underneath, with the formula used.
Features
- X% of Y
- X is what % of Y
- Percentage change (+/−)
- Increase or decrease by %
Why Choose In-Browser Percentage Calculator vs Cloud Converters?
| Feature | Toolora (In-Browser) | Traditional Cloud Tools |
|---|---|---|
| Data Privacy | 100% Private (Files stay on device) | Uploaded to remote servers |
| File Size Limits | Unlimited (Limited only by your RAM) | Restricted (e.g. 10MB–50MB caps) |
| Processing Speed | Instant (Zero upload/download delay) | Slow upload & queue waiting |
| Ads & Popups | Clean, distraction-free | Heavy banner & interstitial ads |
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 200 is 200 × 15 ÷ 100 = 30.
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100. Going from 50 to 75 is (75 − 50) ÷ 50 × 100 = 50% increase.
Is a 20% increase followed by a 20% decrease the same value?
No. 100 increased by 20% is 120, and 120 decreased by 20% is 96. The second percentage is applied to a larger base.