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Umbrellas

Unit of Measurement	Inches	mm
A. Radius (?) One half of the umbrella's fabric diameter -- measure over a rib from one edge to the center point. Close * *		inches
B. Number of Gores (?) The number of triangular pie shaped panels with seams radiating from the center (often 8 as in the image above and never less than 3). Close * *		3 to 20
Hem (?) Finished width of the doubled hem all round the Umbrella. A one inch hem would add two inches of fabric to the length of each gore. This will be zero if a binding is used to finish the circumference of the umbrella. Close * *		inches
C. Open Diameter (?) Measure the diameter of the opened umbrella if possible. This diameter will normally be roughly 10% less than twice the radius measured above. This measurement determines the shape of the umbrella "cone". Close * *		inches
Fabric Width (?) Actual width of fabric (often 46, 54, or 60 inches -- 1168, 1372, and 1524 mm) Close * *		inches

Vent with Fly:
Yes (?) A 16 inch opening will be provided at the center with a 28 inch circular fly to cover it. Close	No (?) There will be no hole at the umbrella's center. Close

NOTE: Our goal is to make the Fabric Calculator as accurate as possible, but please double-check all results thoroughly. Sailrite will not be held responsible for any miscalculations, cut fabric, or purchased fabric as a result of this software.