Adding a half-inch to the mattress size in both length and width is a good rule of thumb.

Name: Adding a half-inch to the mattress size in both length and width is a good rule of thumb.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The standard sizes for mattresses are fixed, and adding a half-inch to both length and width may not accurately match the standard sizes, potentially leading to issues with fitting sheets or bed frames.

Adding a Half-Inch to the Mattress Size in Both Length