Percentage Calculator
Calculate a percentage, compare two numbers or see a percentage increase or decrease instantly. Copy your result or download a professional PDF.
Enter the percentage and the amount. The result updates as you type.
How to use the percentage calculator
Choose a calculation
Select percentage of a number, what percentage, or percentage change.
Enter two numbers
Use whole numbers or decimals. Negative numbers are supported for general percentages. Percentage change requires a positive original value.
Get an instant result
See the answer immediately. Copy it or download a clean PDF report.
Percentage formulas and examples
Percentage of a number: multiply the amount by the percentage and divide by 100. What percentage? divide the part by the whole and multiply by 100. Percentage change: subtract the original value from the new value, divide by the original and multiply by 100.
Frequently asked questions
How do I calculate 15% of a price?
Enter 15 in the percentage field and the price in the amount field. For example, 15% of 200 is 30. To find a sale price after a 15% discount, subtract 30 from 200.
What is the difference between percentage and percentage change?
A percentage expresses a part of a whole. Percentage change compares a new value with the original value and measures the relative increase or decrease.
What if the original value is zero?
Percentage change is undefined when the original value is zero. For this simple business calculator, use a positive original value to calculate increases or decreases consistently.
Does a 20% increase followed by a 20% decrease return to the original?
No. Starting with 100, a 20% increase gives 120. A 20% decrease from 120 gives 96, which is 4% below the original.
Is the PDF free and private?
Yes. The PDF is generated directly in your browser without an account. The calculation values are not sent to our server by this tool.
Use this calculator for general percentage calculations. Tax, pricing and financial decisions may require additional information or professional advice.