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Square in a Square Calculator

This calculator calculates all the key dimensions of a square in a square block given either the finished inside square length or the finished outside square length as a starting point.

For example, suppose the length of the inside finished square is 5 inches. The calculator will determine that the outside finished square is 7 1/8 inches. It will also tell you that you will need to cut a square (the corner side square) with a side whose length is 4 3/8 inches. You will then cut that square along the diagonal to create 2 triangles that are pieced with the inside square. You will need to cut 2 such squares to create a total of 4 triangles so as to complete the outer square.

Please note that this calculator assumes a 1/4 inch seam allowance and all calculated measurements are to the nearest 1/8 inch.


Having a problem with a calculator or have a suggestion? We want to know!

Select starting dimension Select the length Results
Inside Square Finished Length
     Inside Square Unfinished Length

Outside Square Finished Length
     Outside Square Unfinished Length

     Corner Square Side Length
 
 

 
 

 
 
 

This calculator is designed and copyrighted by Quilter's Paradise. It is available free to use strictly for non-commercial, personal purposes only. Quilter's Paradise makes no warranty or representation as to the calculator's quality, performance or accuracy, and, in no event, will be liable for any damages resulting from its use. The user assumes the entire risk as to the calculator's quality, performance and accuracy.


Web site last updated September 16, 2014

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