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Circle Skirt Calculator

🧵 Type 📏 Waist circumference

Measure at the waistband level. 📐 Skirt length

From waistband to hem.

🎯 Waist radius

🧶 Fabric length (R + length + hem)

Step-by-step derivation

Quick summary

References & formulas

Skirt type	Fullness factor f	Waist radius R (base)
Full (360°)	1	R = W / (2π) − SA_waist
3/4 (270°)	0.75	R = W / (2π·0.75) − SA_waist
Half (180°)	0.5	R = W / (2π·0.5) − SA_waist
Quarter (90°)	0.25	R = W / (2π·0.25) − SA_waist

Fabric length F = R + L + SA_hem. Seam allowances used here are 2 cm (converted to your units).

Common fabric widths are 44″ and 60″; wider skirts/lengths often require piecing panels.

Circle skirt radius from waist & fullness: standard circumference relations.
General sewing practice on lengths/allowances & fabric widths are widely referenced in dressmaking guides.

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