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Percentage Calculator – % of, % Change, Increase/Decrease, Reverse Percentage & Discount (Free Online)

Percentage Calculator – % of, % Change, Reverse Percentage & Discount

Use this free Percentage Calculator for fast X% of Y, what percent, percent increase/decrease, reverse percentage, and discount & final price (stackable discounts + tax). Everything runs in your browser—no data saved.

Percentage Calculator

History

Examples

  • X% of Y: 15% of 200 = 30
  • What percent: 30 is 25% of 120
  • % Change: 80 → 100 is a 25% increase
  • Reverse %: If 115 is after a 15% increase, original was 100
  • Discount: Price 1,999 with 10% and 5% off, then 18% tax → final shown in the tool

FAQ – Percentage Calculator

Are multiple discounts added or sequential?

They’re sequential. “10% and 5% off” means the second 5% applies to the already discounted price, not the original.

What if the base/denominator is zero?

You cannot divide by zero. The tool will ask you to enter a non-zero base/denominator.

How precise are the results?

Results display up to 6 decimal places. Internally the browser uses double-precision floats.

Is my data stored?

No. Everything runs locally in your browser. You can export your own history if you want.

Free Percentage Calculator online. Find X% of Y, what percent A is of B, percent increase/decrease, reverse percentage, and discount & final price (stackable discounts + tax). Copy results and export history. 100% browser-based.
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