In order to measure finish carpentry trim for installation and ensure you have enough for the job, we like to use the following technique that works quite well.

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For any given running length of trim measure up to the nearest foot and then add another foot. 

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For example:

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If your wall measures 11 feet 9 inches, we would round that 9 inches up to a whole foot (12' feet) and then add another 1 foot to equal 13' feet for that wall.

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11' 9" = 12'

12' + 1' = 13' ft total should be ordered.

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When installing it is sometimes more accurate to mark trim in place than to measure and then transfer numbers. It's easy to misread a ruler or to confuse numbers while walking to the saw. It is usually more accurate to hold a board in place to mark its length rather than to use a tape and involve numbers.