Online Flounce Pattern Calculator

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Flounces, sometimes also called circle gathers, are decorative elements made from a circle-shaped piece of fabric. This flounce pattern calculator will make drafting flounces easy for you.

This page contains an easy to use flounce pattern calculator you can use to compute the inner and outer circle dimensions of selected flounce type based on selected flounce length and width.

As there are multiple variations of flounces, there are also multiple different formulas based on which the specific flounce is made. Nonetheless, they have one in common; you can quite simply create them yourself. This online flounce calculator will help you with calculating the dimensions of selected flounce type. No math is required from your side.

If you wish to learn more about the individual formulas of different flounce types, please read this blog post.

Use of seam and hem allowances in the flounce pattern calculator

Please keep in mind, that the calculated results do NOT include seam or hem allowances. You just add them before cutting the pattern pieces out of fabric and can adjust them at the last minute.

However, there are two exceptions; the only cases where the side seam allowances are included in the flounce calculator are the full circle and the double circle flounces. Do not forget to add the seam and hem allowances at the top and bottom of the flounce.

Flounce pattern calculator




* Seam allowance is used to calculate dimensions for full circle and double circle flounces.
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Flounce pattern dimensions for selected flounce type

Quarter circle flounce pattern made by online flounce calculator.
Half circle flounce pattern made by online flounce calculator.
Three quarter circle flounce pattern made by online flounce calculator.
Full circle flounce pattern made by online flounce calculator.
One and a half circle flounce pattern made by online flounce calculator.
Double circle flounce pattern made by online flounce calculator.

How to draw flounces

In order to draw flounces, you can use a pair of compasses. Mark a point on a paper or fabric that will be the center of the inner and outer circle of your flounce and draw two full circles or two circular sectors (this depends on the type of flounces you have chosen to create and sew).


If you need to draw large flounce patterns that exceed the possibilities of your compass, use a pin, string, and string to draw them. To learn about this technique more in detail, please read this blog post.