# Percentage Increase Calculator

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

> The percentage increase calculator adds a percentage to a starting value, or finds the percentage between an old and a new value. It is the quickest way to apply a price rise, pay rise or growth rate.

## Inputs

- Original value
- Increase (%)

## Results

- New value
- Amount added

## Formula

```
New value = original × (1 + increase ÷ 100)
```

## Explanation

Increasing by a percentage multiplies the original by one plus that percentage. A 20% increase multiplies by 1.2.

### How to use the Percentage Increase Calculator

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

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

### How it works

Multiply the starting value by one plus the percentage written as a decimal. Type a new value into the result to find the percentage instead.

### Inputs explained

FieldWhat to enterOriginal valueA numberIncreaseIn %

### What each result means

- **New value** = [Original value] × (1 + [Increase]÷100)
- **Amount added** = [New value] - [Original value]

### Example values

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

Increase (%)New value1027515287.52030025312.53032540350

## Worked example

Inputs — Original value: 250; Increase: 20 %.

Results — **New value = 300**; Amount added = 50.

## Key terms

- **Multiplier**: The factor 1 + p/100 applied to the original value.

## FAQ

**How do I reverse a percentage increase?**
Divide the new value by (1 + p/100). Subtracting the same percentage does not work.

**Is a 50% increase then a 50% decrease back to the start?**
No, it ends 25% lower.

**What formula does the Percentage Increase Calculator use?**
New value = original × (1 + increase ÷ 100).

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