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Percentage Calculator

100% Free

Calculate X% of a number, find what percent X is of Y, or compute percentage change — instantly.

3 Modes
Real-time
No Rounding Errors
Client-Side

What is X% of Y?

%

The base number

Result

10% of 200 is
20

10% of 200 = 20

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  • Responsive design
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  • Always up-to-date 
<iframe
  src="https://tools.town/embed/percentage-calculator/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Percentage Calculator">
</iframe>

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How to Use

  1. 1 Choose a mode — 'Find %' to get X% of a number, 'What %' to find what percent X is of Y, or '% Change' for increase/decrease
  2. 2 Enter the required values in the input fields
  3. 3 The result updates instantly as you type — no button click needed
  4. 4 Use the result for discounts, tax, statistics, or any percentage calculation

Features

  • Three modes: find a value, find a percentage, and calculate percentage change
  • Instant real-time results as you type
  • Colour-coded result — green for increase, red for decrease
  • Handles decimals and large numbers accurately
  • 100% browser-based — nothing is sent to a server
  • Works on all devices including mobile

Why it Matters

Percentages appear everywhere — discounts, exam scores, tax rates, statistics, and salary hikes. Getting a quick, accurate answer without mental math or a spreadsheet saves time and prevents costly mistakes. This calculator covers the three most common percentage problems in one simple interface.

★★★★★

Use Cases

Shopping Discounts

Find exactly how much you save when an item is 20% off

Salary & Tax

Calculate percentage increments or tax on gross income

Statistics & Data

Compute percentage change between two data points

Exam Scores

Convert marks to percentage for result analysis

Frequently Asked Questions

What does 'X% of Y' mean?
It multiplies Y by X÷100. For example, 15% of 200 = 30.
How do I find what percent X is of Y?
Switch to the 'What %' mode. The formula is (X ÷ Y) × 100. So 30 is 15% of 200.
What is percentage change?
It measures the relative change: ((New − Old) ÷ Old) × 100. A positive result means an increase; negative means a decrease.
Can I use decimals?
Yes. Enter values like 12.5% or 1499.99 and the calculator handles them correctly.
📖

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