Free calculator

Circle Skirt Calculator

Set your measurements, compare the skirt, then check your fabric layout.

Measurements

Skirt type

Choose fullness visually. Higher angles create more sweep and usually need more fabric planning.

in

Pattern waist opening = entered waist + ease. For an existing finished waist target, set ease to 0.

in

Measure from waist seam to hem, or start from a common skirt length.

in

Use the width available for cutting, excluding unusable selvages.

Ease 0.5 in, joining seams 0.375 in, hem 0.75 in.

Waistband & elastic planningSeparate advice; these settings are not saved with this skirt.

Waistband and elastic

Separate estimates only; changes here do not update and are not saved with your skirt pattern. Check a sample for fit.

For a single-fold straight waistband. Check the finished band against the skirt waist seamline before cutting.

Waistband sizing and construction
Strip cut length
30.04 in
Strip cut width
3.11 in

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Print one calibration sheet and measure it before printing your full pattern.

What this calculator covers right now

Core drafting math

Supports quarter through double circle skirts with live unit conversion.

Fabric width guidance

Plans the required quarter panels in rows and withholds yardage when they do not fit the usable width.

Honest scope

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Skirt types

Quarter circle: subtle flare, lower fabric use, often needs careful hip/ease checks.

Half circle: balanced everyday fullness with easier fabric planning.

Full circle: classic dramatic sweep and the most common calculator target.

Double circle: maximum volume for dance, costume, and statement silhouettes.

Need help choosing the silhouette before you draft? Compare full, half, and quarter circle skirts.

Fabric guide

The estimate uses quarter panels laid flat in one layer, including reserved room for straight joining seams. Use the width left after excluding unusable selvages. Add waistband, closure, shrinkage and pattern-matching allowances separately.

If the diameter exceeds your usable width, use this next step: Plan a circle skirt panel layout.

Circle skirt formula

The calculator adds ease to your waist measurement, divides that adjusted waist by 2 x pi x the selected fullness factor, then adds skirt length and hem allowance to find the hem radius.

For the reasoning behind the calculation, read this guide: Understand the circle skirt radius formula.

  1. Adjusted waist = waist + ease
  2. Waist radius = adjusted waist / (2 x pi x fullness factor)
  3. Hem radius = waist radius + skirt length + hem allowance
  4. Total diameter = hem radius x 2

Drafting and cutting guides

Circle skirt pattern-making guideFabric and cutting layout guideHow to measure for a circle skirtCircle skirt panel layout guide

Frequently asked questions

How do I calculate the radius for a circle skirt?

Add your preferred ease to the waist measurement, then divide by 2 x pi x the skirt fullness factor. A full circle uses 1, a half circle uses 0.5, and a double circle uses 2.

Does this calculator support inches and centimeters?

Yes. You can switch between inches and centimeters, and the measurement inputs convert automatically so the draft stays consistent.

Why does fabric width change the layout advice?

The calculator reserves a square for each quarter panel and checks how many fit across the usable width. A narrower fabric may require more rows; if one panel does not fit, it asks for manual layout instead of estimating yardage.