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Quilters use this triangle cutting chart when piecing a diagonal layout quilt. In a diagonal layout, blocks are placed onpoint.
Glossary Terms for Triangle Setting Chart
 onpoint
 diagonal layout, diagonal setting
 corner triangle
 setting triangle, side triangle
 finished size
First we have to understand what setting and corner triangles are. The corner triangles, shown in black, are in the corners. Setting or side triangles, shown in gray, are along the edges.
Cutting Triangles from Squares
This triangle cutting chart is based on cutting squares then subcutting the squares into triangles. Cut the square twice diagonally for setting triangles.
Cut the square once diagonally for corner triangles
Why Cut Triangles from Squares?
Squares are easy to cut. First, cut along the width of fabric. Next, subcut into squares. Finally, subcut the squares into 2 or 4 triangles. Cutting squares this way ensures the grain lines follow the outer edges of the quilt.
The picture below shows the grain lines for the setting triangle cuts. These cuts put either the crosswise or lengthwise grain along the outside edges of the quilt.
NOTE: Another way to cut setting and corner triangles is to cut strips and use a specialty ruler. This method is covered in the article, Using Rulers to Cut Setting and Corner Triangles (coming soon).
How to Use the Triangle Cutting Chart
Step 1 – First, find the finished block size in column 1.
Step 2 – Next, find the corresponding number in column 2. Cut squares to this size in inches. One square gives you 4 setting triangles.
Step 3 – Finally, find the corresponding number in column 3. Cut 2 squares to this size in inches. One square gives you 2 corner triangles.



3.0  51/2  3 
3.5  61/4  35/8 
4.0  7  33/4 
4.5  75/8  41/8 
5.0  83/8  41/2 
5.5  91/8  47/8 
6.0  93/4  51/8 
6.5  101/2  51/2 
7.0  111/4  55/8 
7/5  12  61/4 
8.0  125/8  65/8 
8.5  133/8  67/8 
9.0  14  71/4 
9.5  143/4  75/8 
10.0  51/2  8 
10.5  161/8  83/8 
11.0  167/8  83/4 
11.5  171/2  91/8 
12.0  181/4  93/8 
12.5  19  93/4 
13.0  193/4  101/8 
13.5  203/8  101/2 
14.0  211/8  107/8 
14.5  213/4  111/8 
15.0  221/2  111/2 
15.5  231/4  12 
16.0  24  121/4 
16.5  245/8  125/8 
17.0  253/8  13 
17.5  261/8  131/4 
18.0  263/4  135/8 
Recommendations



Article – Grain Lines in Quilting
Article – Quilt Blocks Set OnPoint