How do you measure a TV screen?


A lot of consumers think that a television's screen size is the width of the screen from left to right. But in reality, it is a diagonal measurement.

  1. Position the measuring tape

    Get a measuring tape. Place one end at the lower-left corner of the television screen. Have someone hold the other end at the upper-right corner of the screen.

  2. Mark the distance

    Mark the distance. If the tape is at 42 inches, for instance, the TV has a 42-inch screen. This size is what retailers mean when they say, "42-inch TV."

  3. Identify the screen ratio

    A standard TV screen ratio is 4:3, but a wide-screen ratio is 16:9, according to Radio Shack. The standard ratio means that the screen has 4 inches of width for every 3 inches of length.

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