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# Add or Subtract a Percentage

Using this tool you can find any percentage in three ways. So, we think you reached us looking for answers like:

1. How to increase 10 percent to 100? Or may be:
2. Add or Subtract a Percentage Calculator?

See the solutions to these problems just after the Calculator below.

Please change values of the two first boxes of each calculator below to get answers to any combination of values:

### Add or Subtract a Percentage Calculator

Start Value + or - Percent End Value
(%) =

Details

## How to add a percentage to a number - Step by Step

To add a percentage (%) to a number, i.e., If you want to add a y percent to an x amount, you can use the following formula:

End Value = x + (( y / 100) * x )

Where: x represents the start or inicial value and y the percent we want to add. See the example below:

### How to increase or add 10% to 100?

Plugging the values in the formula above:

End Value = 100 + (( 10 / 100 ) x 100)

End Value = 100 + (( 0.1 ) x 100 )

End Value = 100 + ( 10 )

## How to subtract a percentage from a number - Step by Step

To subtract a percentage (%) from a number, i.e., If you want to subtract a y percent to an x amount, you can use the following formula:

End Value = x - (( y / 100) * x )

Where: x represents the start or inicial value and y the percent we want to subtract. See the example below:

### How to decreasee or subtract 10% to 100?

Plugging the values in the formula above:

End Value = 100 - (( 10 / 100 ) x 100 )

End Value = 100 - (( 0.1 ) x 100 )

End Value = 100 - ( 10 )