Percentage Calculator
Calculate percentage increase, decrease, or find what percent one number is of another. Fast and free.
Our free percentage calculator handles all common percentage problems in one place. Find what percentage one number is of another, calculate percentage increase or decrease between two values, or find a number when you know the percentage. Perfect for students, shoppers, teachers, and anyone doing quick math. No sign-up, no ads blocking the tool — just enter your numbers and get instant results.
How to Use: Percentage Calculator
1. Select the type of percentage calculation you need: basic %, increase/decrease, or find the original value.
2. Enter your numbers in the input fields.
3. The result updates instantly as you type.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 = 150 × 20 ÷ 100 = 30.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value, and multiply by 100.
Can I calculate percentage decrease?
Yes. Enter the original and new values in the percentage change calculator. A negative result means a decrease.
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