Percentage Calculator

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Calculate percentages, percentage change, and percentage of totals instantly.

X (%)

Y (number)

20% of 150 =30

80 is40%

Old Value

New Value

100 → 120 =+20.00%

How to use Percentage Calculator

1. Paste or type your input in the box above.
2. The tool processes your input instantly — no button click needed in most tools.
3. Copy the output or download the result.

How do I calculate percentage of a number?

Multiply the number by the percentage and divide by 100. E.g., 20% of 150 = (150 × 20) / 100 = 30.

How do I calculate percentage change?

% change = ((New Value − Old Value) / Old Value) × 100.

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