How do I calculate a 20% tip?

Use the "Basic" mode. Enter "20" as the percentage and your bill amount as the value.

How do I calculate percentage increase?

Use the "Change" mode. Enter original value, set percentage, and toggle to "Increase". Formula: Value + (Value × %/100).

Calculate percentages easily. Find X% of Y, calculate percentage increase/decrease, and determine what percentage X is of Y.

Calculate X% of Y

Percentage Increase/Decrease

Find What Percent X is of Y

Quick Percentage Presets

Copy Results

Basic Mode: Enter a percentage and a value to find the part (e.g., 20% of 50).
Change Mode: Calculate price increases or discounts by entering an original value and the percentage change.
Find % Mode: Enter two numbers to see what percentage one is of the other.
Copy: Click the copy icon to instantly save the result to your clipboard.

Everyday Math: Perfect for calculating tips, sales tax, discounts, and grades.
Business: Quickly determine profit margins, ROI, and growth rates.
Error-Free: Avoid mental math mistakes with precise, instant calculations.