Sew Measure

Sewing calculator

Circle Skirt Calculator

Calculate waist and outer radii, then check a conservative fabric footprint.

Your measurements

Use one unit for every dimension in this form.

Body or waistband measurement.

Extra room added at the waist.

Allowance outside the waistline.

Allowance beyond finished skirt length.

Finished vertical skirt length.

Usable width available for the entire conservative sector footprint.

Select the intended circle fraction.

Optional percentage added before cutting waste.

Optional percentage for layout and cutting waste.

Circle skirt result

Waist radius
4.93 in
Outer radius
26.43 in
Fabric to buy
1.500 yd
Circle skirt radiiA scaled planning diagram. Use the matching text result and cut list for exact dimensions.fullfull-circle conservative sector bound
Circle skirt radii. The drawing is scaled for comparison; written dimensions control.

Formula

Waist radius comes from arc length divided by the selected circle angle; allowances and skirt length form the outer radius.

Assumptions

  • The conservative sector footprint must fit the fabric width.
  • No extra panel seams are invented.

When a tested commercial pattern gives different cutting dimensions or layout instructions, follow that pattern.

Worked example

  • 80 cm waist + 2 cm ease
  • Full circle with 1 cm waist seam
  • 50 cm length + 2 cm hem on 120 cm fabric

The waistline radius is 13.051 cm and the outer radius is 66.051 cm, so the conservative footprint is 132.101 × 132.101 cm. It does not fit within 120 cm of usable width, and the calculator does not invent panel seams.

Verification note

Draw the radii on paper and confirm the waist opening against a waistband or muslin.

Learn and verify