How do I calculate 18% of 250?

In “What is X% of Y”, enter 18 and 250. The answer is 45.

What about a tip or tax?

Same card. 20% of the bill is a tip; add it to the original for the total. Percent change is the right card for “went from 80 to 100.”

Percentage calculator

Calculate percentages instantly: what is X% of Y, X is what percent of Y, and percent change.

What is X% of Y?

% of

Result

X is what percent of Y?

is what % of

Result

18%

Percent increase or decrease

fromto

Increase

25%

How to use the percentage

Three everyday percentage problems, solved as you type: find a percentage of a number, find what percent one number is of another, and compute percent increase or decrease.

Pick a problem
Use the three cards. Each one is a complete calculator — you do not need to remember the formula.
Read the result
Results update live. Copy the number when you need it in a spreadsheet or message.

About this tool

Percentages show up in grades, discounts, tips, growth rates, and stats. The formulas are short, but mixing them up is common — that is why the labels on this page are sentences, not symbols.

Frequently asked questions

How do I calculate 18% of 250?: In “What is X% of Y”, enter 18 and 250. The answer is 45.
What about a tip or tax?: Same card. 20% of the bill is a tip; add it to the original for the total. Percent change is the right card for “went from 80 to 100.”