Fabric Needed
198 ft²
Hoops
6
Wire
43 ft
Fabric Size
22×9
Row Cover Fabric
198 ft²
22 × 9 ft
Hoops
6
Total Wire
43 ft
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Inputs
Result
a=2, b=2.5. Wire = (pi/2) × sqrt(2×(4+6.25)) = 5.1 ft. Hoops = ceil(20/4)+1 = 6. Fabric = 22 × 8 = 176 ft².
Inputs
Result
a=1.5, b=1.5. Wire = (pi/2) × sqrt(2×(2.25+2.25)) = 3.4 ft. Hoops = ceil(10/3)+1 = 5. Fabric = 12 × 5 = 60 ft².
Fabric width must span over the hoops plus 1 ft on each side for anchoring. For a 4 ft wide bed with 2.5 ft tall hoops, you need about 8 ft wide fabric. Length equals bed length plus 2 ft for end tuck-in. A 4×20 ft bed needs about 22×8 ft = 176 sq ft of fabric.
Space hoops 3–4 ft apart for most row covers. Use 3 ft spacing in windy areas or with heavy fabric (1.5 oz). Use 4 ft spacing for lightweight fabric (0.5 oz) in sheltered locations. Always add one hoop at each end of the bed.
Lightweight (0.5 oz) for summer insect protection (85% light), medium (1.0 oz) for spring/fall frost to 24°F (70% light), heavy (1.5 oz) for hard frost to 20°F (50% light). Use insect netting for pest control without frost needs.
Hoop height should be 6–12 inches above the tallest crop you plan to grow. For lettuce and low crops, 18 inches is enough. For tomatoes or peppers under row cover, use 3–4 ft hoops. Standard garden row cover hoops are 2–2.5 ft tall.
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Last Updated: Mar 19, 2026
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