Y/Yangopen
← Products

Percentage calculator

of 30
is what % of 20%
20%
± 11090

Rounded to 4 decimals · up to 40 digits per number

Apps

How to calculate a percentage

Type in any field and the answer changes with you. Both ways of writing a number work: 1.250,5 in Vietnamese and 1,250.5 in English. The answers use the page's own format.

  1. X% of Y

    20% of 150 is 30. Type the percent and the number.

  2. X is what percent of Y

    30 of 150 is 20%.

  3. Percent change

    From 100 to 120 is +20%. A fall shows a minus sign.

  4. Increase or decrease

    100 increased by 10% is 110; decreased by 10% is 90.

Frequently asked questions

Not answered here? Ask Yangopen

How do I find X% of a number?

Type the percent in the first field and the number in the second. 20% of 150 is 30.

How do I find the percent change?

Type the first number and the second. From 100 to 120 is +20%; from 120 to 100 is −16.67%, because the change is measured from where it started.

What number format can I type?

Vietnamese or English: 1.250.000, 1250000, 1.250,5, 1,250.5 or 12,5. Dots group thousands and a comma is the decimal mark, unless the number is written in the English way.

Why does a division show a dash?

“X is what percent of Y” cannot be answered when Y is zero, and percent change needs a starting number other than zero. The page shows a dash instead of a made-up answer.

Is it free? Do I need an account?

Free, no account, no limit. The calculation runs in your browser.