How do I calculate X% of Y?

Multiply Y by X divided by 100. Example: 25% of 200 = 200 × (25/100) = 200 × 0.25 = 50.

How do I calculate percentage change?

Percentage change = ((New Value − Old Value) / |Old Value|) × 100. A positive result means an increase; a negative result means a decrease. Example: from 80 to 100 = ((100−80)/80) × 100 = 25% increase.

How do I find what percentage X is of Y?

Divide X by Y, then multiply by 100. Example: 50 is what percentage of 200? = (50 / 200) × 100 = 25%.

How do I add a percentage to a number?

To add P% to a number N: N × (1 + P/100). Example: 200 + 15% = 200 × 1.15 = 230.

Percentage Calculator

Calculate percentages, percentage change, increase, and decrease instantly.

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About Percentage Calculator

Free online percentage calculator with multiple modes. Calculate what percentage of a number is, find percentage change between two values, calculate percentage increase or decrease, and find what percentage X is of Y. Multiple calculators on one clean page — instant results for every scenario.

How to Use Percentage Calculator

Choose the calculation type: What is X% of Y, Percentage change, or X is what % of Y.
Enter the required values in the input fields.
The result calculates instantly as you type.
Switch between calculation modes using the section tabs.

Frequently Asked Questions

How do I calculate X% of Y?: Multiply Y by X divided by 100. Example: 25% of 200 = 200 × (25/100) = 200 × 0.25 = 50.
How do I calculate percentage change?: Percentage change = ((New Value − Old Value) / |Old Value|) × 100. A positive result means an increase; a negative result means a decrease. Example: from 80 to 100 = ((100−80)/80) × 100 = 25% increase.
How do I find what percentage X is of Y?: Divide X by Y, then multiply by 100. Example: 50 is what percentage of 200? = (50 / 200) × 100 = 25%.
How do I add a percentage to a number?: To add P% to a number N: N × (1 + P/100). Example: 200 + 15% = 200 × 1.15 = 230.