Percentage Decrease Calculator
Subtracts a percentage from a number.
Result
- New value
- 220
- Decrease
- 30
How to use the percentage decrease calculator
- Enter the starting value.
- Enter the decrease (%).
- The results update as you type, or press Calculate.
- Read the new value first, then the supporting figures below it.
Formula
New = value × (1 − p/100).
Worked example
For example, with these inputs:
- Starting value: 250
- Decrease (%): 12
the calculator returns:
- New value: 220
- Decrease: 30
Background
Each formula has assumptions built in. Area formulas assume flat shapes, volume formulas assume regular solids and statistical measures assume the data you enter is the data you want to describe. Knowing the assumptions helps you pick the right tool.
Calculators are best used to check working rather than replace it, especially for exams where method marks count. Work the problem by hand first, then confirm with the calculator.
Frequently asked questions
How does the percentage decrease calculator work?
It applies this formula: New = value × (1 − p/100).
Can I use any units?
Yes, as long as every input uses the same unit. The answer will be in that unit (squared for areas, cubed for volumes).