Percentage Calculator
Calculate percentages, percentage increase, decrease, and more.
✅ 100% Free
🔒 Privacy First
⚡ Instant Results
What is a Percentage Calculator?
A percentage calculator helps you find what one number is as a percentage of another, add or subtract a percentage, and calculate percentage change between two values.
How to Use This Percentage Calculator
- Choose the type of percentage calculation you need.
- Enter the required numbers.
- Click Calculate.
- Copy the result if needed.
How It Works
Percentages are fractions with a denominator of 100. To find X% of Y, multiply Y by X/100. Percentage change is (new − old) / old × 100.
Example Calculation
What is 15% of 200? 200 × 15/100 = 30.
Frequently Asked Questions
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value, then multiply by 100.
How do I calculate percentage decrease?
Subtract the new value from the old value, divide by the old value, then multiply by 100.
Privacy & Data Processing
All calculations run in your browser. No input is sent to our server.
Last updated: 2026-09-01