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A newspaper page
Newspaper pages are laid out on a grid that consists of a margin on 4 sides, a number of vertical columns and space in between columns, called gutters.Broadsheet newspaper pages in the United States usually have 6 columns, while tabloid sized publications have 5 columns.
In the United States, a common newspaper column measurement is about 11 picas wide (or about 1.83 inches), though this measure varies from paper to paper and in other countries. The examples in this article follow this assumption for illustration purposes only.
Column inches and advertising
Newspapers sell advertising space on a page to retail advertisers, advertising agencies and other media buyers. Newspapers publish a "per column inch" rate based on their circulation and demographic figures. Generally, the more readers the higher the column inch rate is. Newspapers with more affluent readers may be able to command an even higher column inch rate. For most newspapers, however, the published rate is just a starting point. Sales representatives generally negotiate lower rates for frequent advertisers.
Advertisements are measured using column inches. An advertisement that is 1 column inch square is 11 picas wide by 1 inch high. The column inch size for advertisements that spread over more than one column is determined by multiplying the number of inches high by number of columns. For example, an advertisement that is 3 columns wide by 6 inches high takes up 18 column inches (3 columns wide multiplied by 6 inches high).
To determine the cost of the advertisement, multiply the number of column inches by the newspaper's rate. So, if a newspaper charges $10 per column inch, the cost for the advertisement discussed above would be $180.00 (18 column inches multiplied by $10.00). Advertisements that span over more than one column also gain a small amount of extra space in between columns because they stretch across the gutters. Gutters are the empty space between columns. Gutters range from about 10 points to about 1 pica wide. In addition, most newspapers charge for an extra column if an advertisement is a double truck.
In the newspaper industry, ad and newsroom staffers will refer to an advertisement's size by saying "it's a (column width) by (inch height) ad," replacing the words in parentheses () with a single figure. This can be confusing because it refers to two distinct measurements as if they were measured with the same unit. Normally one would think a 3 by 6 advertisement would be 3 inches wide by 6 inches high — but in reality it's actually about 5.5 inches wide by 6 inches high. In writing, an "×" is usually used to separate the two figures. Whether written or spoken, most, if not all, newspaper professionals understand the first figure is the column width and the second figure is the inch height.
Recently, some newspapers have converted to a "modular" system that simplifies ad size and eliminates the need to figure out column inches. In a modular system ad sizes are represented by the amount of the total page the ad takes up. For example 1/2 page, 1/4 page, 1/8 page, etc. This has been a popular system among some newspapers because it simplifies the layout process (i.e. less ad sizes to fit in newspaper) and makes pricing much easier for an advertiser to understand.
Column inches and editorial content
Column inches are also used as an ad-hoc estimate of the importance of a news story and are also used to tell how much copy a reporter should write. This harks back to the paste up days, when in fact newspaper stories used to be printed on long strips of paper that were 1 column wide. The length would vary based on how long the story was.
The software used in most present-day newsrooms still measures column inches to give reporters and editors an estimate on how much space a story will take up on a page. Reporters usually refer to story lengths in inches, which actually refers to how many column inches a story takes up. Although it varies, it is generally agreed upon that there are 25-35 words in a column inch.