Calculate seam-line radii and equal panel angles for a circle skirt, with a drawing and measurement table.
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Calculate seam-line radii and equal panel angles for a circle skirt, with a drawing and measurement table.
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For home sewists drafting circular skirts. Enter waist, finished length and optional ease in one unit. The circle multiple accepts quarter (0.25), half (0.5), full (1), double (2) and custom values. Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count. Each panel must be at most 360°. Draw the arcs from one centre, join their ends and repeat the panel count. The SVG shows one complete panel, not a half-pattern on a fold.
r = (C + E) / (2πF); R = r + L; θ = 360F / N
Waist radius: 12.732395 cm
r = (C + E) / (2πF); R = r + L; θ = 360F / N
Waist radius: 12.732395 cm
No. Add seam and hem allowances and draft the waistband and opening separately. It does not estimate fabric, stretch, shrinkage or fit. Test on paper; a 360° panel needs an opening to join other panels.
Calculations run on your device. Form inputs are not sent to a server.
The initial choice follows your browser region. Your choice is remembered on this device. Gallons are US gallons. Switching units keeps your numbers unchanged and interprets them in the new unit.
Numbers stay unchanged. Check the new unit and enter the intended measurement, or select an example for that system.
Enter waist, finished length and optional ease in one unit.
Choose the mode that matches the data you entered.
Options: cm · in
Enter waist, finished length and optional ease in one unit.
Enter a numerical value for this quantity. Use the unit shown beside this field. cm / in
Minimum: 0.1 · Maximum: 10000 cm
Enter waist, finished length and optional ease in one unit.
Enter a numerical value for this quantity. Use the unit shown beside this field. cm / in
Minimum: 0.1 · Maximum: 10000 cm
The circle multiple accepts quarter (0.25), half (0.5), full (1), double (2) and custom values.
Enter a ratio or multiplier; 0.5 means one half, not 50.
Minimum: 0.01 · Maximum: 10
Enter a whole number; fractional counts are not valid.
Minimum: 1 · Maximum: 120
Enter waist, finished length and optional ease in one unit.
Enter a numerical value for this quantity. Use the unit shown beside this field. cm / in
Minimum: 0 · Maximum: 1000 cm
For home sewists drafting circular skirts. Enter waist, finished length and optional ease in one unit. The circle multiple accepts quarter (0.25), half (0.5), full (1), double (2) and custom values. Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count. Each panel must be at most 360°. Draw the arcs from one centre, join their ends and repeat the panel count. The SVG shows one complete panel, not a half-pattern on a fold.
Calculated from your entries using the method below.
Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count.
Calculated from your entries using the method below.
Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count.
Calculated from your entries using the method below.
Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count.
Calculated from your entries using the method below.
Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count.
Calculated from your entries using the method below.
Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count.
Calculated from your entries using the method below.
Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count.
Calculated from your entries using the method below.
Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count.
Calculated from your entries using the method below.
Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count.
Calculated from your entries using the method below.
Radius = (waist + ease) / (2π × multiple); divide the total angle by panel count.
Calculated from your entries using the method below.
Mistake: Changing units and assuming the entered numbers were converted.
Fix: Numbers stay unchanged. Check the new unit and enter the intended measurement, or select an example for that system.
Mistake: Treating a result as valid outside the described scope.
Fix: No. Add seam and hem allowances and draft the waistband and opening separately. It does not estimate fabric, stretch, shrinkage or fit. Test on paper; a 360° panel needs an opening to join other panels.
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