Quilter's Math Etc.

Half Square Triangles (HST):  add 7/8" to your finished size.
Quarter Triangles:  add 1 1/4" to your finished size

Setting Quilt Blocks on a Diamond

Corner Setting Triangles (Half Square):

Finished size of block (e.g. 12") ÷ 1.414 + .875 = SIZE

Side Setting Triangles (Quarter Square):

Finished size of block (e.g. 12") x 1.414 + 1.25 = SIZE

Fraction to Decimal Conversion Chart:

1/8 yd = .13	1/4 yd = .25	1/3 yd = .33
3/8 yd = .38	1/2 yd = .5	5/8 yd = .63
2/3 yd = .67	3/4 yd = .75	7/8 yd = .88

Mattress Sizes:

Quilt Sizes: