This website uses cookies

As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: ""

Show Details
HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
LoginThis is necessary to sign in to the HubPages Service.
Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
AkismetThis is used to detect comment spam. (Privacy Policy)
HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
Amazon Web ServicesThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized. (Privacy Policy)
CloudflareThis is used to quickly and efficiently deliver files such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
MavenThis supports the Maven widget and search functionality. (Privacy Policy)
Google AdSenseThis is an ad network. (Privacy Policy)
Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
Index ExchangeThis is an ad network. (Privacy Policy)
SovrnThis is an ad network. (Privacy Policy)
Facebook AdsThis is an ad network. (Privacy Policy)
Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
AppNexusThis is an ad network. (Privacy Policy)
OpenxThis is an ad network. (Privacy Policy)
Rubicon ProjectThis is an ad network. (Privacy Policy)
TripleLiftThis is an ad network. (Privacy Policy)
Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisements has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
jump to last post 1-3 of 3 discussions (5 posts)

How to calculate percentage change?

  1. Fritz Isaacs profile image83
    Fritz Isaacsposted 5 years ago

    How to calculate percentage change?

    How do you calculate percentage change and what is it useful for?

  2. SidKemp profile image93
    SidKempposted 5 years ago

    The key to calculating percentage change is to identify the base valuee from which the percentage will be calculated.

    For example, if an object was worth $100 on January 1, 2012. We start here, so this is the base value. A year later, on 1/1/2013, it was re-appraised at $140, it's value has increased $40. The change is $40. The percentage change is (change in value)/(base value) then times 100, to make it a percentage. That is 40/100, or 0.40, times 100, or 40%.

    The tricky issue with percentage change is, if the base (that is, the base value) is changed, the numbers come out phoney. This can happen by accident, or on purpose. Here is an example: I work for a company, and make $100,000 / year. The company hits hard times and calls for a 10% salary reduction for everyone. We accept. That means, for me, the 10% change is 10% of my base salary, $100,000, or $10,000. The change is downward, so my new salary is ($100,000 - $10,000) or $90,000. So far, so good.

    A year later, the company says, "we're doing better now, and we're restoring the prior salary reduction. Everyone gets a 10% raise. But they calculate from the current salary, not my original salary. So I get a raise of 10% of $90,000, or $9,000, and my new salary is $99,000.

    I used to make $100,000. I got a 10% cut then a 10% raise. But I now make only $99,000, and I'm out a thousand dollars. How did that happen? The raise was a percentage of a smaller base than the base used to calculate the cut.

    Boy, am I pissed.

    This kind of error or trickery happens all the time with percentage change.

    Percentage change is very useful for seeing rates of change and making projections about growth. But assuming a rate of change will be steady is risky business.

    Percentage change is also useful for comparisons. Say a company trains its salespeople. One person's monthly sales increase by $10,000, another by $5,000. It looks like the training was twice as effective for person #1. But now we look, and, before the training, salesperson #1 was making $100,000/month in sales, and #2 was making $50,000/month. The percentage change was a 10% increase in both cases. The training was equally effective for both salespeople.

    There are two good books to read to learn more. One is Business Statistics Demystified by Steve Kemp and Sid Kemp (that's me), and the other is a classic called How to Lie With Statistics by Huff (1954).

  3. suranjith_e profile image61
    suranjith_eposted 5 years ago

    take the different between two values and divide it by 100. easy smile

    1. profile image47
      m4ryposted 5 years agoin reply to this

      no, you divide the difference by the original amount, then you multiply by 100.  going from 15 to 17 is a 13% change since ((17-15)/15)*100 = 13.

    2. suranjith_e profile image61
      suranjith_eposted 5 years agoin reply to this

      my apology. you are correct