Add or Subtract a Percentage Calculator

Start Value Percent End Value
=

Details

Details
🔗 Help our site grow by sharing it!

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 B percent to an amount, you can use the following formula:

End Value = A + (B100 × A )

Where: A represents the start or initial value, and B is 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 × 100)

End Value = 100 + (0.1 × 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 B percent from an amount, you can use the following formula:

End Value = A - (B100 × A )

Where: A represents the start or initial value, and B is the percent we want to subtract. See the example below:

How to decrease or subtract 10% to 100?

Plugging the values in the formula above:

End Value = 100 - (10100 × 100 )

End Value = 100 - (0.1 × 100)

End Value = 100 - (10)