# Percentage Decrease Calculator

URL: https://speedycalculator.com/calculators/math/percentage-decrease/
Last updated: 2026-10-25

> The percentage decrease calculator reduces a value by a percentage, or finds the percentage drop between two values. Use it for discounts, weight loss, depreciation or falling prices.

## Inputs

- Original value
- Decrease (%)

## Results

- New value
- Amount removed

## Formula

```
New value = original × (1 − decrease ÷ 100)
```

## Explanation

Decreasing by a percentage multiplies the value by one minus that percentage. A 15% decrease multiplies by 0.85.

### How to use the Percentage Decrease Calculator

- **Original value**
- **Decrease**
- Want to work backwards? Type a value into **New value** and **Decrease** is calculated for you.

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Multiply the original by one minus the percentage as a decimal. Type the new value into the result to find the percentage.

### Inputs explained

FieldWhat to enterOriginal valueA numberDecreaseIn %

### What each result means

- **New value** = [Original value] × (1 - [Decrease]÷100)
- **Amount removed** = [Original value] - [New value]

### Example values

How the main result changes when **Decrease** changes and everything else stays at the example values above:

Decrease (%)New value7.57411.2571156818.756522.5623056

## Worked example

Inputs — Original value: 80; Decrease: 15 %.

Results — **New value = 68**; Amount removed = 12.

## FAQ

**Can a decrease be more than 100%?**
Not for quantities that cannot go below zero, such as prices.

**How is this different from percentage change?**
Percentage change handles rises and falls; this tool applies a fall.

**What formula does the Percentage Decrease Calculator use?**
New value = original × (1 − decrease ÷ 100).

**Can I work backwards from the result?**
Yes. Type the result you want into New value and the calculator finds the matching decrease.