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Percentage Calculator

Math & Numbers

Calculate percentages, increases, decreases, and ratios. Free, private — all processing in your browser.

What is X% of Y?

What is% of=?

X is what % of Y?

is what % of=?

Percentage Change

Fromto=?

Increase Value by %

increased by% =?

Decrease Value by %

decreased by% =?

How to use

1. Enter or paste your data in the input area above
2. Adjust settings or options as needed
3. Click the action button or see real-time results
4. Copy the result with the copy button

All processing happens in your browser. Nothing is sent to any server.

About this tool

Calculate percentages with three calculation modes: find what X% of Y is (e.g., what is 20% of 150?), find what percentage X is of Y (e.g., 30 is what % of 200?), and calculate percentage change between two values (e.g., from 100 to 150 = +50%). Each mode provides instant results as you type. Use it for discount calculations, tax computations, grade percentages, tip calculations, markup/margin analysis, and any mathematical operation involving percentages. The percentage change calculator shows both the direction (increase/decrease) and magnitude, color-coded green for increases and red for decreases.