The Sailrite Fabric Calculator

The Cone Calculator

Unit of Measurement
A. Circumference at Top (?)
Measure the circumference of the cone at its narrow end. If only the diameter at this point can be determined, measure the diameter and multiply it by 3.14 to find the circumference.
 
inches
B. Circumference at Bottom (?)
Measure the circumference of the cone at its wide end. If only the diameter at this point can be determined, measure the diameter and multiply it by 3.14 to find the circumference.
 
inches
C. Height (?)
Measure the height in a straight line from the bottom circumference to the top circumference (measure the height of the sloping surface).
 
inches
Seam Allowance or Hem at Top (?)
The width of extra fabric at the top required for hem (or seam allowance if attachment to additional panels such as a top).
 
inches
Seam Allowance or Hem at Bottom (?)
The width of extra fabric at the bottom required for hem (or seam allowance if attachment to additional panels such as a skirt).
 
inches
Width of Join Tab  (?)
Seam allowance for overlap to create cone (defaults to 1/2 inch or 12.7 mm).
inches
Fabric Width (?)
Actual width of fabric (often 54, 63 and 98 inches -- 1372, 1600 and 2489 mm)
   
inches