Pouch Pattern Calculator
Designing your own boxy pouch with the exact dimensions you want has never been easier. Enter your desired length, width, and height of the finished pouch and the seam allowance you want use. The calculator will tell you what dimensions to cut the fabric!
This calculator works for inches and centimeters. Simply type in the value of the finished pouch dimensions you want and the fabric size is automatically calculated. Be sure to fill out all four fields for the calculator to produce accurate pattern dimensions.
If using inches, the seam allowance you plan to use must be in decimal form. Common seam allowances in decimal form: 3/8 = 0.375 1/2 = 0.5 5/8 = 0.625 3/4 = 0.75
You can either design the pouch to use a commonly available zipper length, or you can trim any zipper that is longer than the needed length to the pouch size.
If you’re curious about the math formula the calculator is using, check out this blog post. I explain the math and how you can do the formula yourself if you’re interested.
There are are few different methods to sew these little pouches with lining. Using the French seam method is nice because it’s fast and gives the bag more structure. Here’s how to do it.
(Note: The dimensions used in these instructions may not reflect what your pattern pieces look like. Depending on the dimensions of your pouch, your “Length” may be longer than the“Width” — unlike these illustrations. Just remember the zipper always goes on the “Length” side!)
12) Turn the pouch right side out. Wohoo! It’s ready to be filled with all sorts of lovely things.
I hope this tool can be useful to you and make drafting pouches quick and easy. If you’d like to share a pouch you’ve made using this calculator on Instagram, feel free to tag me @sarkirsten. I’d love to see what you create!