Percentage Calculator
Use this free percentage calculator to find a percentage of a number, calculate percentage change between two values, or determine what percentage one number is of another.
How the percentage calculator Works
This tool uses the following formulas to compute results:
Percentage of a number: (Percentage / 100) × NumberWhat percent is A of B: (A / B) × 100Percentage increase/decrease: ((New − Old) / Old) × 100
About Percentage Calculator
Use this free percentage calculator to find a percentage of a number, calculate percentage change between two values, or determine what percentage one number is of another.
Use the inputs above to calculate your result instantly. Results update automatically as you type. All calculations happen in your browser, so your data is never sent to a server.
Frequently Asked Questions
How do I calculate a percentage of a number?
Convert the percentage to a decimal by dividing by 100, then multiply by the number. For example, 20% of 50 is 0.20 × 50 = 10.
How do I calculate percentage change?
Subtract the original value from the new value, divide by the original value, then multiply by 100. A positive result is an increase; a negative result is a decrease.
Can this calculator handle percentage decrease?
Yes. Simply enter the original value as the larger number. The calculator will show a negative percentage change automatically.
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