The Sailrite Fabric Calculator

Four Sided Umbrellas

Unit of Measurement: inches cm
Gores (radiating seams): 4 Gores (?)
Four gores -- a seam radiating from each corner only.
6 Gores (?)
A seam at each corner and two at the center of the "length" edges.
8 Gores (?)
This Umbrella has 8 gores. Eight seams radiate from the edges to the center.
A. Width (shortest side) (?)
Measure the distance from one corner to the closest corner.
B. Length (longest side) (?)
Measure the distance from one corner to the most distant corner.
C. Hip Measurement ( Suggested) (?)
Measure over ribs from corners to center. All four lengths should be equal. The suggested value assumes a tent peak 5% of the unbrella perimeter in height -- measure carefully. Note that the measurement is to the projected (if necessary) point at the center of the umbrella.
Hem (?)
The width of a fold of cloth that finishes the umbrella border (usually 3/4 inch -- 1.9 cm”). A similar hem runs all round the umbrella's center opening (covered by the fly).
Fabric Width (?)
Actual width of fabric (often 46, 54, or 60 inches -- 1168, 1372, and 1524 mm)
The Umbrella Assembly:
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Fabric required = {{data.yards}} yards. Dimensions below include hem and seam allowances.
Seam allowances = {{data.edgeAllowance}} {{data.UofM}}. When two panels are joined the resulting seam reduces their finished width by {{data.edgeAllowance * 2}}.

List of Materials: Outdoor Umbrella Fabric = {{data.yards}} Yards.
V-69 Polyester Thread = 1 Cone.
YKK® Continuous Zipper Chain #5 White (Coil Chain) = 3 Feet.
YKK® Zipper Slider #5 White Metal Single Lock Pull (Coil Chain) = 1 Each.
Polyester White Hook 1" and Polyester White Loop 1" = 1 Foot.
#0 Spur Grommet 1/4" (Brass) = 1 Grommet Per Rib (if required).
Seamstick 3/8" Basting Tape for Canvas (50 yds.) = 1 Roll.

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