How To Perfectly Measure A Frame When Cutting Mitered Corners

How to Perfectly Measure a Frame When Cutting Mitered Corners

Picture frames and boxes require joining two boards to create a right angle. The cleanest way to do that is cutting 45-degree angles at the end of each board, called a mitre cut. Here's the formula to determine the length each of your boards should be cut.

Picture: GmanViz

First, measure the size of the glass or photo you want to surround with a frame. Then measure the width (facing you) of the frame material you've chosen. Double that width and and add it to the length and width of the glass you want frame. Those numbers will be the length and width of your frame material.

For example, let's say you want to frame a 20cm x 25cm photo with wood that is 1cm wide. That means the length of two sides of your frame must be cut to 28cm and the other sides must be cut to 23cm in length.

After cutting your 45-degree miter corners the inside of the frame material will be the perfect dimension to fit your photo.

A mitre box and saw is the easiest way to cut mitres, but you can use a compound mitre saw too -- just make sure to follow these these safety tips.


Comments

    First, measure the size of the glass or photo you want to surround with a frame. Then measure the width (facing you) of the frame material you’ve chosen. Double that width and add it to the length and width of the glass you want frame. Those numbers will be the length and width of your frame material.This is more wrong than wrong! There will be a rebate on the back inside edge of the frame material. THIS is where you need to take your measurements from!! Otherwise you'll end up with a frame that doesn't actually fit the glass. Stupid article.

    Last edited 26/08/15 8:39 am

      @Mixedemoticons, Given their math is wonky (see Kelso's math below), I think they are factoring in a rebate. However, without stating as much, this article is ridiculous.

    Unless I'm missing something,
    20 + (2x1) does not equal 23...
    25 + (2x1) does not equal 28...

    And who puts two great big nails though each corner of the frame?

    Just because it is a picture of a mitre joint doesn't make it a picture frame.

    Poor article from all perspectives. Delete immediately!

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