Your Workroom

Making Bad.Az bags, one calculation at a time.

Units

Scale method

By percentage

By measurement

Scale percentage (%)

100% = original. 80% = smaller. 120% = larger.

Measurements

Lock any measurement that should not scale — seam allowances, hardware sizes, zipper lengths.

LabelOriginalScaled

Gusset length

Circumference (in)

Enter your panel measurements below. For irregular shapes, measure the perimeter and enter it directly in the circumference field above.

Width at widest point (in)

Height at tallest point (in)

Circumference

Auto-populated in the circumference field above

Seam allowance — attaching gusset to bag panels (in) typically 0.25"

Used to calculate the working gusset length from the circumference.

Seam allowance — joining gusset pieces (in) typically 0.375"

Added to the top and bottom of each zipper panel and bottom gusset where pieces are joined.

I know my zipper panel length

I know my bottom gusset length

Zipper panel length (in)

Bottom gusset length (in)

Gusset width

Desired finished gusset depth (in)

The finished depth of your bag once sewn — e.g. 3" means the completed bag will be 3" deep.

Equal zipper panel widths

Different zipper panel widths

Seam allowance — zipper attachment (in) typically 0.25"

Left and right edges of zipper panels where they attach to the zipper tape.

Seam allowance — bag attachment (in) typically 0.25"

Left and right outer edges of the assembled gusset where it attaches to the bag panels.

Your gusset cross-section