Learn how to check for square and correct it using the 3-4-5 rule or a tape measure with this detailed guide for beginner woodworkers.
supplies needed
Corner clamping jig
Assembly square
Speed square
Quick read measuring tape
One-handed trigger clamps
rULE 1 – THE 3-4-5 METHOD OR RULE
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The 3-4-5 method is essentially the Pythagorean theorem method. Remember that Algebra you swore you’d never use in real life? You may need it to build that bookshelf after all.
RULE 2 – USING A TAPE MEASURE
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Use your tape measure and take a measurement from one corner to the one diagonally across from it.
How to correct for square
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Once you measure the diagonals, push the opposite corners with the larger diagonal towards each other. This will push out the two adjacent sides and help correct for square.
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