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Percentage Change Calculator

Calculate percentages in every direction: X% of a number, what percent X is of Y, percentage change, increase and decrease.

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Result

This page opens the percentage calculator in percentage-change mode: enter a starting value A and a final value B, and the tool reports how much B differs from A in percent, clearly labeled as an increase or a decrease.

The formula divides the difference by the starting value: (B − A) ÷ A × 100. The direction matters — a price going from 200 to 250 is a +25% increase, but falling from 250 back to 200 is only a −20% decrease, because the base of the comparison changed. This asymmetry is the single most common percentage mistake, and the labeled result makes it impossible to miss.

Percentage change is the standard way to express price movements, salary revisions, traffic growth, inflation and portfolio returns. Type any two values, positive or negative, and the result updates live in your browser — no data leaves your device.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • What is X% of Y, and X is what percent of Y.
  • Percentage change between two values with increase/decrease direction.
  • Increase or decrease any number by a given percent.

Key Benefits

✓ Five percentage modes in one tool — no need to rearrange formulas in your head.
✓ Every answer comes with the worked formula, so you can check and learn the math.
✓ Instant results as you type, computed locally with nothing sent to a server.

Use Cases

  • • Work out what X% of a number is — VAT, commission, interest or a share of a budget.
  • • Express growth or decline as a percentage change between two values, correctly based on the starting value.
  • • Increase or decrease a price, salary or quota by a percent in one step with the worked formula shown.