Is the percentage calculator free to use?

Yes. It’s free and runs in your browser - no signup, no install.

How do I find X% of a number?

Pick the ‘What is X% of Y’ mode, type the percentage and the number, and read the result. For example, 18% of 2500 = 450.

How do I calculate percent increase or decrease?

Use the change mode. Enter the old and new values - the tool returns the percent change: (new − old) / old × 100.

Can I add tax or GST using percentages?

Yes. Use the ‘X% change from Y’ mode to increase a base amount by a percentage - ideal for adding tax, service charges, or markups.

Are there rounding issues?

Only round the final value. Rounding mid-calculation introduces small errors. The tool keeps full precision internally and displays the rounded result.

Does the tool store my numbers?

No. Calculations run in your browser and aren’t stored on our servers.

Percentage Calculator

Calculate percentages, percentage increases, and decreases

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