Percentage Calculator
Calculate percentages
Percentage Calculator
Calculate percentages, increase, decrease and percentage change with 5 different operations.
Key Features & Highlights
Calculate percentage of number, percentage increase/decrease, percent change, and what percent X is of Y.
See results immediately as you type - no need to click calculate button.
Find original value from percentage - useful for discounts, taxes, and markups.
Calculate percentage increase or decrease between two values with sign indication.
See the exact formula used so you can verify and learn how percentages work.
Perfect for quick calculations on the go - works flawlessly on any device.
How to Use Percentage Calculator
Choose Calculation Type
Select what you want: % of a number, % increase/decrease, or what % X is of Y.
Enter Your Values
Input the two numbers required for your selected calculation type.
See Instant Result
The percentage result appears automatically with the exact calculation shown.
Copy or Verify
Copy the result to clipboard or check the formula used to verify accuracy.
Frequently Asked Questions
How do I calculate percentage of a number?
Percentage of X = (percent/100) × X. For example, 25% of 200 = (25/100) × 200 = 50. Our calculator does this instantly for any values.
How to calculate percentage increase?
% Increase = ((New - Old) / Old) × 100. If price went from 100 to 150, increase is ((150-100)/100) × 100 = 50%.
What is percentage change?
Percentage change measures relative difference between two values. Positive means increase, negative means decrease. Very useful for comparing values over time.
How do I find what percent A is of B?
Formula: (A/B) × 100. Example: What percent is 25 of 200? (25/200) × 100 = 12.5%.
Can I calculate discount percentages?
Yes! Use percentage decrease. Original: 500, Sale: 400. Discount = ((500-400)/500) × 100 = 20% off.
How to calculate tip percentage?
For 15% tip on $50: (15/100) × 50 = $7.50. Or use our dedicated Tip Calculator for more options including bill splitting.