Skip to content

Percentage Calculator: What Is X% of Y?

Find what a percentage of a number is, for example what is 15% of 80.

Percentage of a number
Fill both boxes; the answer updates at once.

Answer
12
15% of 80 = 12
In words
92
Number plus the percentage
68
Number minus the percentage

Private: Everything runs in this page. Nothing you type is sent anywhere or saved.

Updated

On this page
  1. Percentage examples
  2. Formula
  3. How the percentage of a number works
  4. What this tool does not do
  5. Frequently asked questions
  6. Related tools

Percentage examples

QuestionAnswer
10% of 505
25% of 8020
15% of 20030
7.5% of 1209
150% of 4060

Formula

answer = percentage x number / 100

How the percentage of a number works

  1. Step oneType the percentage in the first box.
  2. Step twoType the number you want the percentage of in the second box.
  3. Step threeRead the answer. The tiles also show the number plus and minus that percentage.

What this tool does not do

  • It does not round to money or to a set number of places; long results are cut at 8 decimals.
  • It does not know about tax rules or tips.
  • It finds a part of one number; it does not compare two numbers.

Frequently asked questions

How do I work out 15 percent of a number in my head?

Find 10 percent by moving the decimal point one place left, then add half of that for the other 5 percent.

Can the percentage be above 100?

Yes. 150% of 40 is 60, one and a half times the number.

How is this different from percent change?

This tool finds a part of one number. Percent change compares two numbers, an old one and a new one.