How do I calculate what percent X is of Y?

Switch to the 'X is What % of Y' tab. Enter X in the first field and Y in the second. The result shows X as a percentage of Y. For example, 15 is 60% of 25.

How do I find the percentage change between two numbers?

Use the '% Change' tab. Enter the starting value in 'From (A)' and the ending value in 'To (B)'. A positive result means an increase; a negative result means a decrease.

What does 'X% of Y' mean?

It means multiplying Y by X divided by 100. So 20% of 150 = 150 × 0.20 = 30. Use the '% of Number' tab to calculate this instantly.

Can I calculate a decrease percentage?

Yes. In '% Change' mode, enter the larger number as A and the smaller number as B. The result will be a negative percentage, indicating a decrease.

Is this calculator accurate for financial calculations?

Yes, it uses standard floating-point arithmetic and rounds to 6 significant digits for display. For high-precision financial work, verify critical calculations with a dedicated accounting tool.

Percentage Calculator

Three ways to calculate percentages — instantly, no sign-up required.

What is X% of Y?

Percentage (%)

Of number

Result

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Free Percentage Calculator

Zolkit's percentage calculator handles three of the most common percentage problems in one place: finding a percentage of a number, determining what percentage one number is of another, and calculating the percentage change between two values. All results are instant — no submit button. Works completely in your browser with no data sent to any server.

Three Calculation Modes

Find percentages of numbers, determine what percent X is of Y, or calculate percentage change between any two values.

Instant Results

Results update as you type — no submit button needed. See your answer the moment you enter a value.

One-Click Copy

Copy the result to your clipboard with a single click. Paste directly into spreadsheets, reports, or messages.

Private by Design

All calculations happen in your browser. Nothing is sent to a server or stored anywhere.

Works on Any Device

Fully responsive layout that works beautifully on phones, tablets, and desktops.

100% Free

No login, no subscription, no ads. Just a fast percentage calculator, always available.

How to Use the Percentage Calculator

1
Select one of three tabs: '% of Number' to find X% of Y, 'X is What % of Y' to find what percent one number is of another, or '% Change' to calculate increase or decrease.
2
Type values into the input fields. Results appear instantly as you type — no need to press Enter or click a button.
3
Click the Copy button to save the result to your clipboard, or simply read it from the screen.