Sewing / free calculator

Gather ratio calculator

Choose the edge you are attaching to, the fullness you want, and the panel count in your pattern or cut plan. The result adds the panel-edge allowances you specify.

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Finished attachment edgeinGather ratio:1Allowance on each panel edgeinAdds two allowances per panel; use 0 if already included.Number of fabric panels

Live project plan

Cut-edge plan

2 panels at 31 in each

Gathered length60 in

Total cut edge62 in

Finished edge30 in

Check fabric direction, pattern instructions, and real material before cutting.

Before you cut

What this result assumes.

The result is a planning estimate, not a substitute for the pattern, the material in front of you, or the requirements of your quilter. Keep these boundaries with the printed plan.

01
The ratio applies to the gathered edge before seam allowances are added.
02
Every panel receives an allowance on both cut ends, including the two outer ends.
03
Bulky fabrics often need less fullness; sheer fabrics may need more.
04
Pattern matching and nap can increase the required yardage.

Yard & Loop rule

Round only at the buying step.

Early rounding compounds. We keep decimal precision through the layout, then round up to a purchasable cut or whole skein.

Gathered edge = finished edge × fullness ratio; panel cut width adds two seam allowances per panel.See the full method

One last check

Does the paper plan rebuild the project?

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2 panels at 31 in each

What this result assumes.

The judgment behind the number.

Choose a gather ratio the fabric can carry

Does the paper plan rebuild the project?