What types of percentage calculations are supported?

X% of Y, X is what percent of Y, percentage increase/decrease between two numbers, and adding/subtracting a percentage from a value.

Does it show the formula?

Yes. Each calculation type shows the formula being applied so you can verify the logic and adapt it to a spreadsheet or code.

Yes. Completely free with no limits and no signup required.

Best Free Online Percentage Calculator

Percentage calculations come up constantly in everyday work — discounts, tax, growth rates, test scores, budget splits, and data analysis. devtoolkit.sh's Percentage Calculator handles the most common percentage operations without requiring you to remember the formulas: what is X% of Y, what percentage is X of Y, percentage increase or decrease from A to B, and adding or subtracting a percentage from a number. Results update in real time as you type. The tool is completely free, runs in your browser with no signup required, and includes clear explanations of the formula used for each calculation so you understand the result.

X (%)

Y (number)

15% × 200 = 30

FAQ

What types of percentage calculations are supported?: X% of Y, X is what percent of Y, percentage increase/decrease between two numbers, and adding/subtracting a percentage from a value.
Does it show the formula?: Yes. Each calculation type shows the formula being applied so you can verify the logic and adapt it to a spreadsheet or code.
Is this free?: Yes. Completely free with no limits and no signup required.