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Draw a square, which is used to draw this octagon.

Step 1: Divide Into Thirds

Divide the lengths into thirds. However, if you want a regular octagon, the lengths must be around the ratio 7:10:7.

Step 2: Split Into 9 Squares

Draw along the markings to create 9 small squares.

Step 3: Make an Octagon in the 9 Squares

Draw lines such that the octagon can be seen in the 9 squares.

Step 4: Erase Forming the Octagon

Erase the unneeded sides such that it forms an octagon.
<p>This isn't a regular octagon.</p><p>This method is accurate:</p><p>https://www.youtube.com/watch?v=QosYGggXRVs</p>
<p>wrong method</p><p>In this procedure all sides of octagon are not equal</p><p>you can see !!!!!!</p>
cool! Just a thought! The diagonals will be sqrt(2) ~1.4 times larger than the the horizontal and vertical sides.

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