Make Accurate Blocks with Triangle Squares Any Size. No Math. No Expensive Dies.

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Half Square Triangle Addition:

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Add the exact seam allowance for Half Square Triangles to your ruler.

Quarter Square Triangle Addition:

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Add the exact seam allowance for QSTs
to your ruler.

How can you tell HSTs apart from QSTs? Watch this video.

Quilt Ruler Upgrade Kit:

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Prep-Tool / Half Square Triangle Addition Combo:

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Make any block with triangle squares
plus Square in a Square
any size you want.

Here's how to make Square in a Square any size:

After cutting pieces accurately,
sew accurate scant 1/4" seam allowances:

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You Want to Make Sure Everything's Level:

If you already have Grip Strips on your 12" or 24" ruler, you'll also need to put one on each edge of your Half or Quarter Square Triangle Addition, so everything's level.

Grip Strips:

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Complete Finished-Size Quilting Sets Include:

  • S Addition for Square, Rectangles & Diamonds
  • H Addition for Half Square Triangles
  • Q Addition for Quarter Square Triangles

The animation above shows the version of Seam Allowance Additions that work with Guidelines Rulers.

Seam Allowance Additions for Guidelines Rulers

All the techniques shown below can be done with the version of Additions that work with regular acrylic rulers.

Seam Allowance Additions for Regular Acrylic Rulers


Finished-Size Quilt Set
for 12" regular acrlic rulers

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Finished-Size Quilt Set
for 12" & 24" regular acrlic rulers

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Finished-Size Quilt Set
for 12" regular acrlic rulers

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Finished-Size Quilt Set
for 12" & 24" regular acrlic rulers

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 Half Square Triangle Addition
for Triangle Squares:

 With This

 You Can Make All of These

 Any Size.

 And save so much time because...

...you won't have to trim your triangle squares down

 to match with your squares in the same block.


 This is the exact amount of seam allowance you should add.

But, rulers only have lines every ⅛".

You can add the exact amount for squares, but not for triangles.

So, everyone adds a little bit more when making triangle squares...

...and then trims them down to match with squares in the same block.

 The precision of a die-cutter,
But Any Size You Want.

The Half Square Triangle Addition lets you add the precise amount of seam allowance for triangle squares right on the edge of your ruler.


Make prefect triangle squares:
 

Your triangle squares will come out the finished size you want with a precise ¼” seam allowance automatically included all around.