ganak.appCircle Skirt Calculator
Free circle skirt calculator. Enter waist and length to get radius, yardage, and cutting instructions for full, half, three-quarter, and quarter circle skirts.
Measure your waist at the narrowest point, keeping the tape snug but not tight. Skirt length is measured from waist to desired hemline.
4.46 in
Cut at 3.83 in (with 0.63 in seam allowance)
Full circle (360°). Cut at the cutting radius; the stitch line is the waist radius.
Pattern Measurements
Key dimensions for cutting your circle skirt pattern
Outer Radius
28.46
in
Hem Circumference
178.80
in
Skirt Type
Full
360°
Fabric & Cutting
How much fabric to buy and how to cut it
Yardage
3.50
yd (3.2 m)
Fabric Length
124.33
in
Single-layer layout
Cut two semicircle halves on single-layer fabric. Join at center front and center back seams.
Fabric estimate includes your seam allowance, 1" hem allowance, and 1" cutting margin. Mark the stitch line at the waist radius, then cut at the cutting radius (seam allowance inward).
What Is a Circle Skirt?
Understanding skirt types and how they drape
A circle skirt is a skirt cut from a circular piece of fabric with a hole in the center for the waist. When laid flat, it forms a donut shape (annulus). The amount of the circle used determines how full the skirt will be when worn.
Full Circle (360°)
Maximum fullness and drape. Uses the most fabric. The skirt forms a complete circle when laid flat. Ideal for dramatic, flowing silhouettes.
3/4 Circle (270°)
Slightly less fabric than a full circle with nearly as much drape. A practical middle ground when fabric yardage is limited.
Half Circle (180°)
Moderate fullness that still swings when you walk. Uses roughly half the fabric of a full circle skirt and is the most popular choice.
Quarter Circle (90°)
The least full option with a gentle A-line shape. Uses the least fabric and is closer to a standard A-line skirt in silhouette.
How the Circle Skirt Radius Is Calculated
The geometry behind every circle skirt pattern
The waist opening of a circle skirt is an arc of a circle. The length of that arc equals your waist measurement, and the fraction of the circle determines the relationship between the arc and the radius.
General formula:
waist radius = waist / (2 x pi x fraction)
Full (360°)
waist / 6.283
3/4 (270°)
waist / 4.712
Half (180°)
waist / 3.142
1/4 (90°)
waist / 1.571
Worked example: For a 28-inch waist full circle skirt: radius = 28 / (2 x 3.14159) = 28 / 6.283 = 4.46 inches. This means you draw an arc 4.46 inches from the center to create the waist opening.
How to Measure for a Circle Skirt
Step-by-step guide for accurate measurements
1. Waist Measurement
Wrap a flexible measuring tape around your natural waistline, the narrowest part of your torso just above the belly button. Keep the tape snug but not tight. If adding an elastic waistband, measure where the elastic will sit.
2. Skirt Length
Decide where you want the hemline to fall. Measure from the waist down to that point. Common lengths: mini (16-18 in), knee (20-24 in), midi (28-32 in), maxi (40-45 in).
3. Seam Allowance
Standard seam allowance is 5/8 in (1.5 cm). Use 1/4 to 1/2 in for serged or rolled edges. The calculator subtracts this from the waist radius and adds it to the fabric requirement.
4. Fabric Width
Check the width of your fabric before purchasing. Most quilting cotton is 44-45 in wide. Knits and wider fabrics are often 58-60 in. The width determines whether you can cut the skirt on a fold or need separate pieces.
Common Circle Skirt Mistakes
Pitfalls to avoid when cutting and sewing
Forgetting fabric grain
Circle skirts are cut on the bias. The hem will stretch unevenly after cutting. Hang the skirt overnight before hemming so the bias stretches settle, then trim to an even length.
Not accounting for seams
If your skirt has a center-back seam (for a zipper), the seam allowance reduces the waist opening. Use the seam allowance input to adjust the radius automatically.
Cutting on too-narrow fabric
If the outer radius exceeds half the fabric width, you cannot fold and cut in one piece. Check the calculator's cutting instructions before purchasing fabric.
Skipping the hem hang time
The bias grain causes different parts of the hemline to stretch at different rates. After cutting, let the skirt hang for 24-48 hours, then re-measure and trim the hem evenly.
About the Circle Skirt Calculator
How circle skirt measurements are determined
This calculator determines the waist radius, outer radius, hem circumference, and fabric yardage for full, three-quarter, half, and quarter circle skirts. It uses the standard arc-length formula (radius = circumference / 2pi x fraction) and accounts for seam allowance, hem allowance, and fabric width when estimating the cutting layout. Results include practical cutting instructions based on whether the skirt fits on folded or single-layer fabric. All measurements update instantly as you adjust the inputs, and the URL updates to let you share or bookmark your exact configuration.
Frequently Asked Questions
Common questions about circle skirt measurements, fabric, and cutting
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Last updated Apr 20, 2026