Circle Skirt Calculator

By Bogna Szyk
Last updated: Dec 02, 2020

If your hobby is sewing and you're wondering how to make a circle skirt, our circle skirt calculator might be right up your alley! It will help you to calculate the amount of fabric that you'll need to create a perfect skirt. We created this tool for one single purpose: to let you enjoy the sewing process without worrying about measurements. This calculator takes over all of the circle skirt math, making the preparations a breeze!

How to make a circle skirt?

A circle skirt is a flowing skirt that, when spread out flat, creates the shape of a circle. It's very easy to sew; once the pattern is cut out of the fabric, all you need to do is sew two ends together, add the waistband and the hem... And yes, you're done :)

Circle skirt math

The most tricky part that makes a lot of people avoid circle skirts is converting your measurements into an actual pattern. You will need two measurements:

  1. Your waist circumference, measured at the level of the waistband, and
  2. The length of the skirt, measured from the waistband.

Once that you know these measurements, decide on the type of the skirt. A full circle skirt is made, as you could expect, out of a circular piece of fabric and will give you a full, voluminous look. 3/4 circle, half circle, and quarter circle skirts require less fabric and are more minimalistic in appearance.

Once you know the type of the skirt, calculate the radius from the center to the waistband:

  • R = waist / 2π - 2 for a full circle skirt;
  • R = 4/3 * waist / 2π - 2 for a 3/4 circle skirt;
  • R = 2 * waist / 2π - 2 for a half circle skirt;
  • R = 4 * waist / 2π - 2 for a quarter circle skirt.

The - 2 at the end of each formula stands for the measurement diminished by 2 cm (seam allowance).

Then, calculate the fabric length you need according to this formula:

fabric length = length + R + 2

Again, the + 2 stands for the hem allowance.

After you've found both the radius and the fabric length, spread out your fabric. You need to draw two circles with a common center: one of radius R and one of fabric length F. Follow the image below to cut out your pattern - and now, you can get straight to the sewing part of the process.

circle skirt

Circle skirt calculator example

Let's try to plan a skirt together. Remember that instead of performing calculations by hand, you can always use the circle skirt calculator calculator to help you with the math!

  1. Decide on the type of the skirt. Let's choose a 3/4 circle skirt - not overly flowing.

  2. Take your waist measurement. Let's say it's equal to 75 cm.

  3. Decide on the length of the skirt. Let's assume it's going to be a midi skirt of length 60 cm.

  4. Use the formula for the waist radius:

R = 4/3 * 75 / 2π - 2 = 13.9 cm

  1. Use the formula for fabric length:

fabric length = 60 + 13.9 + 2 = 75.9 cm

Now, draw two circles with a common center, one with the radius equal to 13.9 cm, and the other with the radius 75.9 cm. That's it - you're done with the circle skirt math!

Bogna Szyk
Full circle skirt
Skirt length
Waist radius
Fabric length
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