Circle Skirt Calculator

Note: If you are making a circle skirt with an elastic waistband, you might want to increase the waist circumference a bit. Same caveat if you are making a circle skirt without a placket.

Parameters

Calculations

type_of_skirt_ratio = 1 / skirt_fullness //

equivalent_circle = type_of_skirt_ratio * waist_circumference //

number_of_seams = 2 * number_of_panels //

total_seam_allowances = number_of_seams * seam_allowance //

adjusted_circumference = equivalent_circle + total_seam_allowance //

inner_radius = adjusted_circumference / (2 * pi) //

adjusted_inner_radius = inner_radius - seam_allowance //

angle_of_panel = (skirt_fullness * 2 * pi) / number_of_panels // (radians)

required_width = (skirt_length + adjusted_inner_radius) * sin(angle_of_panel) //

Result

Cut out an inner radius of (cm)

At an inner angle of (degrees)

(Optional) You will need fabric which has a width of at least (cm)

The width of a bolt of fabric tends to be in the range between 89cm and 150cm (35in and 60in). https://en.wikipedia.org/wiki/Bolt_(cloth)

(Optional) Suggested Pattern Layout

This layout required fabric length of (cm)