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Percentage 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

Percentages show up everywhere — discounts, taxes, tips, interest rates, grades, statistics — yet each situation needs a slightly different formula. This percentage calculator collects the five everyday cases in one place: what is X% of Y, X is what percent of Y, the percentage change from A to B, and increasing or decreasing a number by a percent.

Pick a mode, type two numbers, and the answer appears instantly together with the full worked formula. Seeing the arithmetic — for example 200 × 25% = 200 × 0.25 = 50 — makes it easy to sanity-check the result or reuse the method with pen and paper later.

The percentage-change mode deserves a special note: it divides the difference by the starting value, so going from 200 to 250 is +25%, while going from 250 back to 200 is −20%. That asymmetry trips people up constantly; the calculator labels each result as an increase or a decrease so there is no ambiguity.

Everything runs client-side in your browser: no sign-up, no upload, and results recalculate live on every keystroke. Decimal and negative numbers are supported in every mode.

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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.