Measure your waist add wearing ease (about 5cm or 2 inches).
Total waist circumference (TWC) = waist + ease
To get the pattern the right size I started with a large piece of brown wrapping paper (news paper or butchers paper would be great.
And folded it at the corner to make a large triangle
Then use the formula
TWC / 3.1416 = diameter
Measure from the tip of the triangle down each side the radius distance and connect the points with a curve.
Measure from the curve down each side of the paper to the length you want the skirt to be and connect with a curve.
This is the basic pattern for an 8 gored circle skirt (above left). Now if you left the paper folded while you did this open it out and it will look like this (above right).
This is a pattern you can use for a 4 or 2 gored circle skirt.
Don’t forget to add seam allowance to all edges when you cut.
This is a rectangle
Length = is waist + ease + overlap + seam allowance.
Width = (finished width x 2) + (seam allowance x 2)