Circle Skirt Calculator
Enter your waist and the length you want, pick a full, half, quarter, or custom circle, and get the waist and hem radius, the fabric you need, and a free skirt pattern as a full-size PDF for A4 or US Letter paper. No signup, and the PDF is built in your browser.
A circle skirt calculator turns your finished waist (W) into the waist radius of the pattern: W ÷ 2π for a full circle, W ÷ π for a half circle, and 2W ÷ π for a quarter circle. Add the skirt length and hem allowance for the hem radius. A 70 cm waist gives an 11.14 cm full circle radius.
Radius formulas from Omni Calculator and Minerva Patterns. Panel layout and fabric amounts are derived from the pattern geometry. All calculations and the PDF happen in your browser, and no measurements are stored.
How Does a Pleated Skirt Use Fabric Compared With a Circle Skirt?
A pleated skirt uses a straight rectangle of fabric whose width is a multiple of the finished waist, while a circle skirt uses curved panels sized by the waist radius and skirt length. In the Omni Calculator method, knife pleats take about 2 times the finished waist in fabric width and box pleats about 3 times, so a 70 cm waist needs 140 cm of width for knife pleats or 210 cm for box pleats, before seam allowances. A full circle skirt for the same waist and a 55 cm length needs about 146 cm of fabric at least 136.3 cm wide. The Pleated Skirt Calculator applies these multipliers, shows where each fold goes, and gives a one-page cutting plan.
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How Is a Circle Skirt Pattern Drafted From Your Measurements?
A circle skirt pattern is drafted from four inputs: your waist, the ease you add, the skirt length, and the angle of the circle, with seam and hem allowances on top. For a 70 cm waist, 0 ease, a 55 cm length, and a full circle, the draft gives an 11.14 cm waist radius, a 10.14 cm cutting radius, a 68.14 cm hem radius, and two panels that print as one 90 degree wedge cut on the fold. Where a formula comes from a source, we name it; where the choice is ours, we say so.
1. What is the finished waist?
The finished waist (W) is your body waist measurement plus ease, and it is the number the whole circle skirt pattern is drafted from. Our default ease is 0, which is a design choice and not a rule from a source, so a 70 cm waist gives a 70 cm finished waist. For comparison, Winifred Aldrich's tailored skirt block adds 1 cm of waist ease, so you can type 1 cm into the ease field if you prefer a little room. If you have not measured your waist yet, the Dress Size Calculator walks you through measuring your natural waist.
2. How do you find the waist radius for any angle?
The waist radius of a circle skirt is r = 180 × W ÷ (π × α), where W is the finished waist and α is the skirt angle in degrees. The formula comes from arc geometry: the skirt waist is an arc, and an arc is its radius times its angle in radians. For the four common angles, Omni Calculator and Minerva Patterns publish the same values:
| Skirt | Angle | Waist radius | 70 cm waist | Hem around, 55 cm length (our calculation) |
|---|---|---|---|---|
| Full circle | 360° | W ÷ 2π | 11.14 cm | 415.6 cm |
| Three-quarter circle | 270° | (4/3) × W ÷ 2π | 14.85 cm | 329.2 cm |
| Half circle | 180° | W ÷ π | 22.28 cm | 242.8 cm |
| Quarter circle | 90° | 2W ÷ π | 44.56 cm | 156.4 cm |
The calculator accepts any angle from 90 to 540 degrees, so a half circle skirt calculator, a quarter circle skirt, and a double-fullness skirt all use the same formula.
3. What are the cutting radius and the hem radius?
The cutting radius of a circle skirt is the waist radius minus the waist seam allowance, because that allowance sits toward the center of the circle. Omni and Minerva subtract 2 cm; we subtract the seam allowance you enter, with 1 cm (or half an inch) as our default.
The hem radius is the waist radius plus the skirt length plus the hem allowance. Our default hem allowance is 2 cm, the figure Omni uses. With a 70 cm waist, a 55 cm skirt, a 1 cm seam allowance, and a 2 cm hem, a full circle has an 11.14 cm waist radius, a 10.14 cm cutting radius, and a 68.14 cm hem radius.
4. How many panels does the pattern use?
A full circle skirt in our calculator is cut as two half-circle panels, because Minerva notes that a full circle usually does not fit across standard fabric in one piece. The panel count follows our own layout rule:
- Up to 180 degrees: one panel.
- Above 180 and up to 360 degrees: two panels.
- Above 360 and up to 540 degrees: three panels.
Each panel is symmetric, so the printed pattern piece is half a panel that you cut on the fold, with side seam allowance added to the straight edge opposite the fold. For a full circle, that piece is a 90 degree wedge labeled Cut 2 on fold.
5. How is the fabric amount estimated?
The fabric amount for a circle skirt is estimated from the size of the pattern pieces and the fabric width, such as 140 cm or 150 cm. A full circle with a 70 cm waist and a 55 cm length adds up like this:
- Two folded panels at 69.1 cm of length each: 138.3 cm.
- One waistband strip, turned across the fabric: 8 cm.
- Total: about 146 cm (1.46 m), on fabric at least 136.3 cm wide, so 140 cm and 150 cm fabric both fit.
The estimate places the panels one after another along a lengthwise fold, using the bounding box of each piece, with no nesting and no shrinkage allowance. A panel wider than the fabric gets no estimate instead of a guess.
6. How long and wide is the waistband?
The waistband for a 70 cm finished waist is one strip 74.54 cm long and 8 cm wide, cut double and folded lengthwise:
- Length: the 70 cm finished waist plus a 2.54 cm (1 inch) overlap for the closure, after Omni's pleated skirt guide (about 1 inch), plus two 1 cm seam allowances, for 74.54 cm.
- Width: two times our default finished width of 3 cm plus two 1 cm seam allowances, for 8 cm. The 3 cm width is our design choice, not a sourced rule.
7. How does the PDF pattern print across pages?
Our circle skirt PDF pattern tiles the full-size pattern across A4 or US Letter pages, with a 10 mm margin and a 10 mm overlap (our defaults), and puts a page map and a test square on page 1. For a 70 cm waist and a 55 cm full circle, the two generated files differ in grid and page count:
| Paper | Tile grid | Pages | Test square in the PDF |
|---|---|---|---|
| A4 | 5 columns by 3 rows, 2 empty tiles skipped | 14 (13 pattern pages plus page 1) | 100.000 mm |
| US Letter | 4 columns by 4 rows | 17 (16 pattern pages plus page 1) | 101.600 mm (4 inches) |
The circle skirt calculator shows the page count for both paper sizes before the download. Our guide to printing PDF sewing patterns covers the print settings and taping step by step.
How to Sew Your Circle Skirt Pattern
Version 1, steps 1 to 3: How do you print and cut the circle skirt pattern?
You print the circle skirt PDF at full scale, tape the pages, and cut two panels on the fold for a full circle; a 70 cm waist and a 55 cm length take 14 A4 or 17 US Letter pages.
Print the pattern and check the test square
Print the PDF at 100% or Actual size, never Fit to page. Page 1 of the PDF holds the page map and a test square that should measure 10 cm on A4 or 4 inches on US Letter; if not, fix the print setting first.
Tape the pages and cut out the paper pattern
Lay out the pages by the page map, line up the crosses in the overlap corners, and tape each join. The PDF draws the cutting line solid, the seam line dashed, and the fold line dash-dot; cut on the solid line.
Cut the fabric on the fold
Fold the fabric lengthwise, right sides together, and lay the dash-dot fold line of the pattern on the fabric fold. A full circle pattern says Cut 2 on fold: cut two panels and one waistband strip (74.54 cm by 8 cm for a 70 cm waist).
Version 1, steps 4 to 6: How do you sew the zipper, waistband, and hem?
You finish a zipper circle skirt by sewing the side seams around an invisible zipper, attaching the 74.54 cm by 8 cm waistband (for a 70 cm waist), and hemming after a 24 hour hang.
Sew the side seams and insert the invisible zipper
Sew the side seams on the dashed seam line, which sits 1 cm (or half an inch) inside the cut edge by default, leaving the top of one seam open. Press, sew the invisible zipper into the opening, then close the seam below it.
Attach the waistband
Interface the waistband if your fabric is soft, press it in half lengthwise, and sew one long edge to the skirt waist, right sides together, starting at one zipper edge. Leave the 2.54 cm (1 inch) overlap past the other zipper edge, fold the band inside, and close it with a button or a hook and bar.
Let the skirt hang, then level and sew the hem
Hang the finished skirt for 24 hours so the bias sections can drop, as Minerva recommends. Then mark an even hem line on your body or a dress form, trim, and sew a narrow hem around the curve.
Version 2: How do you sew a circle skirt with an elastic waist?
An elastic waist circle skirt is a pull-on skirt drafted from your fullest hip measurement plus ease, not your waist, because a woven waist opening must be at least as large as what it slides over (derived from the geometry). A 100 cm hip measurement gives a 15.92 cm full circle waist radius. To sew it:
- Print the pattern at 100%, check that the test square measures 10 cm on A4 or 4 inches on US Letter, tape the pages, and cut the panels on the fold.
- Sew both side seams fully, since a pull-on skirt has no zipper.
- Cut a waistband strip as long as the skirt waist plus two seam allowances (102 cm for a 100 cm hip measurement with 1 cm seams), sew it into a loop, fold it lengthwise, and stitch it to the skirt waist, leaving a gap for the elastic.
- Thread the elastic through the casing and pin it around your waist where it feels comfortable; elastic stretch varies by product, so fit it on your body, not to a fixed length. Stitch the ends together and close the gap.
- Hang the skirt for 24 hours, then level and sew a narrow hem.
How Do You Choose Fabric for a Circle Skirt?
Choose circle skirt fabric by two things: drape and width. Treasurie's skirt guide puts drape simply: soft fabrics drape, and stiffer fabrics give a skirt more body. A soft fabric falls in folds close to the legs, while a crisper one holds the circle out from the body.
Width decides whether the folded panel fits at all. These are our calculator's results for a 70 cm waist and a 55 cm length, with a 1 cm seam allowance and a 2 cm hem allowance:
| Skirt | Fabric width needed | On 150 cm fabric | On 140 cm fabric |
|---|---|---|---|
| Full circle (2 panels) | 136.3 cm | 146 cm (1.46 m) | 146 cm (1.46 m) |
| Half circle (1 panel) | 158.6 cm | Does not fit | Does not fit |
| Quarter circle (1 panel) | 145.0 cm | 79 cm (0.79 m) | Does not fit |
Check the width printed on the label of the bolt before you buy, and type it into the calculator.
What Does This Circle Skirt Calculator Not Do?
The circle skirt calculator drafts a flat pattern from seven inputs (waist, ease, length, angle, seam allowance, hem allowance, and fabric width), and six things stay outside it:
- A test garment is still worth sewing: make a quick muslin version, check the waist, and adjust the measurement before you cut your good fabric.
- Stretch knits are not handled. The tool assumes a woven fabric, accepts only 0 to 10 cm of waist ease, and has no reduction for knits, because we found no reliable source for one.
- Printer scaling is up to you. The test square measures 100.000 mm on A4 and 101.600 mm on US Letter in the generated PDF file; measure it on paper to check your print.
- Bias drop varies with the fabric, so level the PDF hem line after a 24-hour hang, as Minerva advises.
- Side seam allowance on skirts below 360 degrees shifts the waist arc slightly; with no source that quantifies this, the tool does not correct for it.
- Darts and hip shaping are not part of the pattern, because a circle skirt hangs from the waist (or the hips, for the pull-on version). For your proportions, try the Body Shape Calculator.
Sources
Circle skirt calculator
Omni Calculator
Waist radius values for 360, 270, 180, and 90 degree skirts, the 2 cm waist seam allowance subtraction, and the 2 cm hem allowance we use as our default
Drafting a circle skirt and calculating the radius
Minerva Patterns
Full, half, and quarter circle radii, cutting a full circle as two half-circle panels, a narrow hem on curves, and the 24-hour hang before leveling the hem
Pleated skirt calculator
Omni Calculator
Waistband overlap of about 1 inch, which sets the 1 inch (2.54 cm) overlap in our waistband length, and the fabric width of about 2 times the waist for knife pleats and 3 times for box pleats
The tailored skirt block (Metric Pattern Cutting for Women's Wear, Winifred Aldrich)
University of Manchester course material
1 cm of waist ease on a tailored skirt block, shown as a reference point next to our 0 ease default
Gathered skirt pattern
Treasurie
General note that soft fabrics drape while stiffer fabrics give a skirt more body
Frequently Asked Questions
How do you calculate the radius for a circle skirt?
The waist radius of a circle skirt is your finished waist (W) divided by the angle of the circle in radians. Omni Calculator and Minerva Patterns give the common cases: W divided by 2π for a full circle, W divided by π for a half circle, and 2W divided by π for a quarter circle. A 70 cm waist gives 11.14 cm for a full circle, 22.28 cm for a half circle, and 44.56 cm for a quarter circle. Add the skirt length and the hem allowance to that radius to get the hem radius.
How much fabric do I need for a circle skirt?
A full circle skirt with a 70 cm waist and a 55 cm length needs about 146 cm (1.46 m) of fabric at least 136.3 cm wide, according to our calculator with a 1 cm seam allowance, a 2 cm hem allowance, and the waistband strip included. The amount changes with your waist, your skirt length, and your fabric width. A full circle usually does not fit across standard fabric in one piece, so Minerva cuts it as two half-circle panels with side seams. Buy a little extra if you plan to prewash, because the estimate has no shrinkage allowance.
What is the difference between a full, half, and quarter circle skirt?
A full, half, and quarter circle skirt differ in how much of a circle the skirt makes when you lay it flat: 360, 180, or 90 degrees. The angle sets the waist radius, which Omni Calculator and Minerva give as W divided by 2π for a full circle, W divided by π for a half circle, and 2W divided by π for a quarter circle. For a 70 cm waist that is 11.14 cm, 22.28 cm, and 44.56 cm, and with a 55 cm length the finished hem measures 415.6 cm, 242.8 cm, and 156.4 cm around. A full circle has the most swing, a half circle falls closer to the body, and a quarter circle is close to an A-line shape. Our calculator also accepts any angle from 90 to 540 degrees.
Do I add or subtract seam allowance at the waist of a circle skirt?
You subtract the waist seam allowance from the waist radius of a circle skirt, because the allowance has to sit inside the waist line, toward the center of the circle. The cutting radius is the waist radius minus the allowance, so a full circle for a 70 cm waist goes from an 11.14 cm waist radius to a 10.14 cm cutting radius with a 1 cm allowance. Omni Calculator and Minerva both subtract 2 cm; our calculator subtracts whatever seam allowance you enter, with 1 cm as our default in centimeters and half an inch in inches.
Why does my circle skirt hem look uneven after a day?
A circle skirt hem looks uneven after a day because parts of every circle skirt are cut on the bias, and bias fabric stretches as it hangs. Minerva recommends hanging the skirt for 24 hours before you hem it, then leveling the hem line and sewing a narrow hem around the curve, which is why the hem step comes last in our sewing instructions. On a full circle with a 70 cm waist and a 55 cm length, the finished hem you level measures 415.6 cm around.
How do I print the PDF pattern at the right size?
Print the circle skirt PDF at 100% or Actual size and turn off Fit to page or Shrink to fit. Then print only page 1 and measure its test square before you print the other pages. The square should measure exactly 10 cm on A4 paper or 4 inches on US Letter paper; measured in the PDF file our tool generates, it is 100.000 mm on A4 and 101.600 mm on Letter. If your print differs, change the print setting and print page 1 again. A full circle with a 70 cm waist and a 55 cm length takes 14 A4 pages or 17 US Letter pages.
Can I use this circle skirt pattern for stretch fabric?
The circle skirt calculator assumes a woven fabric and does not adjust for stretch. We did not find a reliable source for how much to reduce the waist radius for knits. The ease field accepts 0 to 10 cm (0 to 4 inches), so the tool never draws a waist smaller than the measurement you enter: a 70 cm waist with 0 ease gives a waist seam line of exactly 70 cm on an 11.14 cm full circle radius, in any fabric. If you sew the skirt in a knit, make a quick test waist first and adjust the waist measurement you type in.
Keep Going: Measure, Print, and Sew
Good measurements and a correctly printed pattern matter as much as the math.
Pleated Skirt Calculator
Fabric width and fold marks for knife or box pleats, with a one-page cutting plan
How to Print PDF Sewing Patterns
Actual size settings, the test square, and taping tiled pages together
Dress Size Calculator
Step-by-step help measuring your bust, waist, and hips
Body Shape Calculator
Turn the same measurements into your shape and the cuts that suit it