Derived from the complete waistline
The radius uses arc length divided by the selected total angle. Half and quarter circles therefore need larger radii than a full circle at the same waist.
Free circular skirt calculator and pattern
Create a circle skirt pattern from the real waist arc
Choose how much of a circle the finished skirt uses and how many identical panels you want to cut. The generator calculates the radius from the complete waist seam, then produces one correctly labelled sector with waist, side-seam, and narrow-hem allowances.
A geometric draft you can verify
The waist arc, radius, and cut count agree
Calculated sectorThe default sample makes a half-circle skirt from two identical 90° panels. Together, their inner sewing arcs equal the waist plus the selected ease.
One printable piece, repeated
Splitting the total angle into panels changes seam placement and fabric use, but it does not change the finished waist or fullness.
Three edges have different jobs
The waist is offset inward, radial panel seams are offset sideways, and the curved hem receives its own narrow allowance.
Width is checked before export
The report compares the generated panel width with your fabric width and suggests more panels when the current sector is too wide.
The preview verifies the mathematical waist seam and physical panel width. It cannot predict bias drop, fabric drape, or the final level hem; those require the real fabric.
The file is full scale. Print at 100%, measure the 5 × 5 cm square, and cut the stated number of identical panels.
Related guides
Measurements
Skirt measurements
Understand waist, hip, length, darts, ease, hem sweep, and silhouette choices.
Different constructionBasic skirt with darts
Use the basic skirt when you need hip shaping, darts, and a controlled straight, pencil, A-line, tapered, or modestly flared silhouette.
Matching componentWaistband pattern
After checking the generated upper edge, send that exact length to the waistband builder instead of retyping a guessed value.
Curved-edge accuracySeam and hem allowances
Review why the waist, radial panel seams, and circular hem need different allowance treatments.
Circle-skirt drafting
Why this is not a flared basic-skirt preset
A basic skirt controls waist-to-hip shaping with darts and side seams. A circle skirt has no darts: its volume comes from a circular sector whose inner arc becomes the waist and whose larger concentric arc becomes the hem.
The calmest flare needs the largest radius
A 90° total sector carries the entire waist, so the inner radius is large and the hem grows moderately. It is closer to an A-line direction but still uses circular geometry without darts.
Balanced movement and manageable volume
A 180° finished sector gives more sweep than a quarter circle without the fabric demand of a full circle. Two 90° panels provide balanced side seams and practical cutting.
Maximum sweep uses the smallest radius
The full 360° waist sits on a complete circle. Four 90° panels keep each printable piece manageable and distribute seams evenly around the garment.
More panels solve width, not fullness
Six panels can fit narrow fabric more easily than two broad sectors. The total angle stays the same, so changing panel count alone does not make the skirt fuller.
Plan an opening before joining every seam
A fitted waist normally needs a zip, placket, or another opening. Leave the chosen seam accessible and add the closure treatment separately; this generator supplies standard panel seam allowance only.
The hem must settle in the actual fabric
Parts of a circular hem lie on the bias and may lengthen unevenly. Assemble the skirt, let it hang, then level and finish the hem instead of trusting the paper length as the final floor distance.
From correct geometry to a wearable skirt
Use the calculated sector as a checked starting point
The generator resolves radius, angle, repeated panels, and cutting allowances. Fit still depends on where the waist is measured, how the waistband is constructed, the chosen closure, and how the fabric behaves on grain and bias.
Measure at the finished waistband position
A high-waist and low-waist skirt do not use the same circumference. Keep the tape level and add only deliberate wearing ease; do not add seam allowance to the body measurement.
Weight changes the apparent silhouette
A crisp cotton holds broad waves, while rayon or viscose collapses into narrower folds and may drop more on the bias. Use fabric with similar behaviour for the test garment.
A narrow finish follows the curve more cleanly
A wide turned allowance must absorb substantial excess around a circular edge. A narrow double turn, bias facing, or appropriate rolled finish usually controls the curve with less distortion.
Keep equivalent panels oriented consistently
The grainline follows the centre of each sector. Mirroring or rotating pieces casually can change sheen, nap, print direction, and the way neighbouring panels fall.
Before cutting final fabric
Check the calculation and the material plan together.
- 01 Confirm the waist was measured at the intended wearing position and includes only the chosen ease.
- 02 Check the cut count and mark which seam will contain the closure.
- 03 Compare the panel width with usable fabric width after removing selvedges.
- 04 Print at 100% and verify the 5 × 5 cm square before taping pages.
- 05 Make a test waist opening, then let the assembled skirt hang before levelling the hem.
From pattern to look
Plan the finished garment
Before you cut fabric, browse skirt ideas in Nastix Design and decide which silhouette and details you want to make.
How and when
Generated from application code
This generator converts the entered measurements into vector geometry. Where a construction has related seams, the software can calculate their lengths; preview, SVG, copyshop PDF, and tiled A4 PDF are produced from the same geometry. These software checks do not replace printing, sewing, or fitting a test sample.
Last recorded review of the generator implementation and documentation: 2026-09-28. The output has not been certified through physical production testing; verify measurements, print scale, seam relationships, fabric behaviour, and fit for your project.
Circle skirt questions
Before you calculate, cut, and hang the skirt
Is the flared basic-skirt preset the same thing?
No. The basic skirt retains front and back shaping, darts, and conventional side seams. This generator creates a true annular sector without darts; the waist is an arc calculated from the selected fraction of a circle.
How is the waist radius calculated?
The adjusted waist is divided by the total sector angle in radians: 2π for a full circle, π for a half circle, and π/2 for a quarter circle. Dividing that total angle into panels does not change the radius.
Why does a full circle use four panels by default?
Four 90° panels keep the printable and cutting width practical, create clear repeatable pieces, and distribute seams evenly. Together they still form the same 360° skirt.
Does adding panels make the skirt fuller?
No. Fullness is controlled by quarter, half, or full circle. Panel count divides that same total angle into narrower pieces for seam placement and fabric width.
Is a zipper included?
No. The panel has standard side-seam allowance, but zipper extensions and specific closure construction depend on the zip and waistband method. Choose one panel seam for the opening before assembly.
Why is the hem allowance narrow?
A curved hem has more cut-edge length than the fold line. A narrow allowance is easier to ease smoothly; test a narrow double turn, rolled hem, or bias-faced finish in the actual fabric.
Why can the finished hem become uneven?
Different parts of each sector lie on straight grain, cross grain, and bias. Fabric can lengthen differently under its own weight, so assemble and hang the skirt before marking the final level hem.