How to use the Percentage Decrease Calculator
- Enter the starting value.
- Enter the percentage to take off.
- Read the reduced value and how much was subtracted.
What does this tool do?
Use this for any reduction: a 15% budget cut, a 30% sale, or an item losing 20% of its value. It multiplies your number by (1 − percentage ÷ 100).
For shop discounts with a second “extra % off” deal, the Discount Calculator handles stacked discounts properly.
Why use it?
- One-step answer for reductions and discounts.
- Shows the multiplier and the amount removed.
- Flags results that go below zero.
Example: a budget cut
A $3,200 monthly budget is cut by 15%. The cut is 3,200 × 0.15 = $480, leaving $2,720.
The formula
New value = Original × (1 − Percentage ÷ 100)
Amount removed = Original × Percentage ÷ 100
Privacy
The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.
Frequently asked questions
Does a 20% decrease followed by a 20% increase get me back to the start?
No. 100 falls to 80, and 20% of 80 is 16, so it only climbs back to 96. To undo a 20% decrease you need a 25% increase.
Last reviewed by the M2Toolkit team.