How do I find what percentage X is of Y?

Divide X by Y and multiply by 100. For example, 45 is what % of 180? → (45 ÷ 180) × 100 = 25%. Use the second tab and enter 45 for X and 180 for Y.

How is percentage change calculated?

Percentage change = ((New Value − Old Value) ÷ |Old Value|) × 100. A positive result means an increase; a negative result means a decrease. If the old value is 0, the change is undefined.

What is the difference between percentage change and percentage point change?

Percentage change is relative to the original value (e.g., from 10% to 15% is a 50% increase). Percentage point change is the absolute arithmetic difference (e.g., from 10% to 15% is a 5 percentage point increase). The tool calculates percentage change.

Can I use this calculator for VAT or tax calculations?

Yes, for basic percentage-based tax math. For example, to find 7% VAT on ฿1,000, use the 'X% of Y' mode with X=7 and Y=1000. For full VAT-inclusive/exclusive calculations, use the dedicated VAT Calculator tool on this site.

Percentage Calculator

Calculate percentages, percentage change, and what percent one number is of another.

Finance

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Percentage (X%)

Total value (Y)

Formula:Result = X% × Y

Enter values above to calculate

How to Use

1
Choose one of the three calculation modes using the tabs at the top.
2
Enter the required values in the input fields labeled X and Y.
3
The result and the formula used are displayed instantly below the inputs.
4
Click the Copy button to copy the result to your clipboard for use elsewhere.

Use Cases

Discount & sale pricing

Find the discounted price of an item — e.g., 20% off ฿1,500 — using the 'X% of Y' mode.

Grade & score analysis

Calculate what percentage of the total marks you scored — e.g., 75 out of 100 — using 'X is what % of Y'.

Investment & portfolio tracking

Measure how much an asset's value has grown or fallen using '% change from X to Y' — ideal for stocks, crypto, or savings.

Business KPI reporting

Compare month-over-month or year-over-year performance metrics quickly to include in management reports.

Frequently Asked Questions

Percentage Calculator handles three essential percentage problems: finding a percentage of a number, determining what percentage one number is of another, and calculating percentage change between two values. Instant results, no sign-up required.

Multiply Y by X and divide by 100. For example, 15% of 200 = (15 × 200) ÷ 100 = 30. Use the first tab in the tool and enter 15 for X and 200 for Y.

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