Browse Definitions:
Definition

# percent change (percent difference)

Percent increase and percent decrease are measures of percent change, which is the extent to which a variable gains or loses intensity, magnitude, extent, or value. The figures are arrived at by comparing the initial (or before) and final (or after) quantities according to a specific formula. It is assumed that both the initial and the final quantities are positive (larger than 0).

Suppose a quantity has an initial value of x1, and then increases or decreases to a final value of x2. The percent change, D%, is calculated by finding the difference x2 - x1 (subtracting the initial value from the final value), then dividing the result of this subtraction by x1 (the initial value), and finally multiplying by 100. Expressed as a formula:

D% = 100 (x2 - x1) / x1

If x2 > x1 (the final value is larger than the initial value, representing an increase in the variable quantity), then D% is a positive number. If x2 < x1 (the final value is smaller than the initial value, representing a decrease), then D% is a negative number.

As an example, suppose you buy stock in two companies A and B, both at a price of USD \$1.25 per share in January of a given year. Suppose that by July, stock A has risen in value to USD \$3.35 per share. Then for stock A:

DA% = 100 (\$3.35 - \$1.25) / \$1.25 = +168%
Percent change is +168%, also expressed as a percent increase of 168%.

Imagine that stock B has fallen to USD \$1.00 per share in the same time period. Then for stock B:

DB% = 100 (\$1.00 - \$1.25) / \$1.25 = -20%
Percent change is -20%, also expressed as a percent decrease of 20%.

 Percent Increase Calculator Enter the two numbers to find percent difference (increase or decrease): to RESULT: Percentage increase or decrease is:
This was last updated in March 2011

### 2 comments

Send me notifications when other members comment.

I am trying to determine if it more appropriate to calculate percent change or percent difference.

I have 2 different lots of the same reagent. The older one yields 1920. The newer one or more current or second one gives us 2256.

Should it be the difference between or a percent change in yield from yesterday to today?

Cancel
I'm not clear on what the difference is between a percent increase and the percent of another number.

For example, I understand the percent increase from 5000 to 15000 is 200%.

But, what I don't understand is how then 15000 could be 300% of 5000 (100 more).  Can you explain the difference?
Cancel

Powered by:

## SearchCompliance

• ### risk map (risk heat map)

A risk map, also known as a risk heat map, is a data visualization tool for communicating specific risks an organization faces. A...

• ### internal audit (IA)

An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

• ### pure risk (absolute risk)

Pure risk, also called absolute risk, is a category of threat that is beyond human control and has only one possible outcome if ...

## SearchSecurity

• ### federated identity management (FIM)

Federated identity management (FIM) is an arrangement that can be made among multiple enterprises to let subscribers use the same...

• ### cross-site scripting (XSS)

Cross-site scripting (XSS) is a type of injection security attack in which an attacker injects data, such as a malicious script, ...

• ### firewall

In computing, a firewall is software or firmware that enforces a set of rules about what data packets will be allowed to enter or...

## SearchHealthIT

• ### 21st Century Cures Act

The 21st Century Cures Act is a wide-ranging healthcare bill that funds medical research and development, medical device ...

• ### vendor neutral archive (VNA)

A vendor neutral archive (VNA) is a technology that stores medical images in a standard format and interface, making them ...

• ### HITECH (Health Information Technology for Economic and Clinical Health) Act of 2009

The HITECH (Health Information Technology for Economic and Clinical Health) Act of 2009 is legislation that was created to ...

## SearchDisasterRecovery

• ### business continuity and disaster recovery (BCDR)

Business continuity and disaster recovery (BCDR) are closely related practices that describe an organization's preparation for ...

• ### business continuity plan (BCP)

A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

• ### call tree

A call tree -- sometimes referred to as a phone tree -- is a telecommunications chain for notifying specific individuals of an ...

## SearchStorage

• ### volume manager

A volume manager is software within an operating system (OS) that controls capacity allocation for storage arrays.

• ### external storage device

An external storage device, also referred to as auxiliary storage and secondary storage, is a device that contains all the ...

• ### NetApp SolidFire

NetApp SolidFire is a business division of NetApp Inc. that specializes in all-flash storage systems.

## SearchSolidStateStorage

• ### hybrid hard disk drive (HDD)

A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close