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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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Project measurements

Common starting points

Examples only — replace every measurement that matters.
Live project plan

Cut-edge plan

2 panels at 31 in each

Gathered length60 in
Total cut edge62 in
Finished edge30 in

Keep the useful version

Take this plan with you.

The exact measurements stay in the URL fragment, which is not sent to our server or analytics.

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

Worked example

A 30 in attachment edge at 2:1 fullness

The gathered length is calculated first; seam allowances are then added to both ends of each panel.

  1. 01
    Gathered edge60 in

    30 in × 2:1

  2. 02
    Panel allowances2 in

    2 panels × two ½ in ends

  3. 03
    Total cut edge62 in
Planning resultCut 2 panels at 31 in each.

Boundary check — Test a short gathered sample: heavy or crisp fabric may not compress cleanly at the chosen ratio.

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.

Questions at the worktable

Before you trust the number.

Answers specific to gather ratio calculator, including the decisions the formula cannot make for you.

01How do I choose between 1.5:1, 2:1, and 3:1?

Make a short sample in the actual fabric and place it against the real seam stack. Start near 1.5:1 for restrained fullness or bulky cloth, around 2:1 for a conventional ruffle, and test higher ratios only when the fabric can compress cleanly.

02Does splitting the gathered piece into panels change the look?

The ratio can stay the same, but panel seams interrupt the distribution. Place joins at logical side or back positions, match any print, and quarter-mark each panel and attachment section so the fullness remains even.

03Will a gathering foot produce the exact selected ratio?

Usually not without calibration. Fabric weight, stitch length, tension, and machine settings change how much a gathering foot contracts the cloth. Stitch a measured sample, calculate its achieved before-to-after ratio, then adjust and verify before running the final panels.

Read before making

The judgment behind the number.

Continue the plan

Make the next check visible.

Move from the result to the material decision most likely to change it.

Reference benchConversions, ruler fractions, and the right inputsPaired field noteChoose a gather ratio the fabric can carry

One last check

Does the paper plan rebuild the project?

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