Circle Skirt Calculator
Find waist radius, hem radius and hem length for a full, half or quarter circle skirt.
Formula
r=W/(2πf); R=r+L; hem=2πfR; f=1, 1/2 or 1/4. Seam-line dimensions only.
Finished waist circumference: 28 in · Finished skirt length: 20 in · Waist radius ≈ 100×(28 in × 0.0254 m/in)÷(2×pi×1) · Hem radius ≈ (11.31909955)+100×(20 in × 0.0254 m/in) · Hem circumference ≈ 2×pi×1×(62.11909955)
How to use
- Choose the circle fraction.
- Enter finished waist and skirt length.
- Read dimensions; add sewing allowances separately.
Examples
- A 20π cm waist with a full circle gives a 10 cm waist radius.
Frequently asked questions
Are seam allowances included?
No. These are finished seam-line dimensions; add waist, side and hem allowances for your construction.
Does this tell me how much fabric to buy?
No. Yardage also depends on fabric width, pattern layout and grain.
Which waist measurement should I use?
Use the intended finished waist circumference, including any ease you want.
Sources
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