Skirt Calculator

Skirt Calculator turns a waist measurement and skirt length into everything you need to cut a circle skirt. For circle skirts it gives the waist radius, the cut radius after seam allowance, the hem radius, the waistband piece and how much fabric to buy for your fabric width. It handles full, three-quarter, half and quarter circle skirts, with zipper or pull-on elastic waist options, and shows a to-scale layout of the panels on your fabric.
You can download a tiled 1:1 pattern PDF for US Letter or A4 paper, with test squares so you can check the print scale before cutting. Fabric yardage can be calculated for 45 inch or 60 inch (115 or 150 cm) fabric, or for a custom width, with a panel layout diagram.
The site also has calculators for pleats, including a printable 1:1 pleat ruler PDF, as well as tiered and gathered skirts, flounces, gathering ratios, continuous bias tape, general fabric yardage, curtains, circle capes and round tablecloths. Measurements work in inches with fractions or in centimetres.
The interface is available in seven languages: English, Simplified Chinese, Japanese, Korean, German, French and Spanish. Everything runs in your browser, you do not need an account, and the tool is free to use. It works on desktop and mobile browsers.
Skirt Calculator is not a shop that sells fabric or sewing patterns, and it is not an AI tool. It is a set of sewing math calculators for home sewists, cosplayers, costume makers, crafters and hobbyists who want to skip the manual maths, buy the right amount of fabric and cut a skirt that fits the first time.
Open the site, enter your waist measurement and the skirt length you want, choose the skirt type, and read off the radii, yardage and layout. Then print the pattern if you want a ready-to-cut template.