# Percentage increase calculator

> Calculate the change between two values.

[Open tool](https://www.toolcabana.com/ps/percent-change) · [حسابونه او مالیه](https://www.toolcabana.com/ps/category/calculators-and-finance)

Tool ID: percent-change. Requested language: ps. Description language: en. Complete guide translation: no; untranslated sections use English.

## Overview (en)

The Percentage increase calculator takes an original value and a new value and returns the percentage change and the raw difference between them. The formula is (new − original) / |original| × 100, so a negative result means a decrease. Using the absolute starting value keeps the sign meaningful even when the original number is negative.

## Supported tasks (en)

Calculate the change between two values.

## Steps (en)

1. Adjust the values; an initial result is calculated from the defaults.
2. Change the basic settings or open Advanced mode to fine-tune the result.
3. Review and copy or download your result. Pause Live results to run manually. Sources or individual settings above 20,000 characters require an explicit run.

## Settings

- Original value (en; key: before; type: number)
- New value (en; key: after; type: number)

## Limitations (en)

Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.

## Privacy and connections (en)

This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.

## Questions (en)

### How do I calculate a percentage increase?

Subtract the original value from the new value, divide by the absolute original value and multiply by 100. Going from 100 to 125 gives (125 − 100) / 100 × 100 = 25%. The calculator also shows the difference of 25.

### How does the calculator handle a percentage decrease?

The same formula is used, so a decrease appears as a negative change. Going from 125 to 100 is (100 − 125) / 125 × 100 = −20%, not −25%, because the starting value is the denominator.

### Why can't I calculate a change from zero?

Percentage change divides by the original value, and dividing by zero is undefined. When the original value is 0, the calculator returns an error instead of a misleading percentage. The new value can be zero.

### Where is my input processed?

This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.

### What are the input limits?

Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.

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