Hoop House Calculator
Estimate hoop house for your project with our free calculator. Get accurate material quantities, costs, and specifications.
Formula
Hoops = (Length / Spacing) + 1; Arc = (pi x Width) / 2; Covering = Arc x Length x 1.15
The number of hoops equals the structure length divided by spacing plus one for the end. Each hoop arc length is half the circumference of a circle with diameter equal to the hoop house width. Total covering area equals the arc length times the structure length, plus 15% for overlaps and end walls. Height equals half the width for a semicircular cross-section.
Worked Examples
Example 1: Standard Market Garden Hoop House
Problem: Calculate materials for a 48 ft x 14 ft hoop house with 4 ft hoop spacing using 6-mil poly.
Solution: Height = 14 / 2 = 7 ft\nHoops = (48 / 4) + 1 = 13 hoops\nArc per hoop = (3.14 x 14) / 2 = 22.0 ft\nTotal conduit = (13 x 22) + 48 = 334 ft = 34 pipes\nCovering = 22 x 48 x 1.15 = 1,214 sq ft
Result: 13 hoops, 34 conduit pipes, 1,214 sq ft covering
Example 2: Small Backyard Hoop House
Problem: Calculate materials for a 20 ft x 10 ft hoop house with 4 ft spacing using 4-mil poly.
Solution: Height = 10 / 2 = 5 ft\nHoops = (20 / 4) + 1 = 6 hoops\nArc per hoop = (3.14 x 10) / 2 = 15.7 ft\nTotal conduit = (6 x 15.7) + 20 = 114 ft = 12 pipes
Result: 6 hoops, 12 conduit pipes, 499 sq ft covering
Frequently Asked Questions
What size conduit is best for a hoop house?
For hoop houses up to 14 feet wide, 3/4-inch EMT (electrical metallic tubing) or 1/2-inch Schedule 40 PVC conduit works well. For widths of 14 to 20 feet, use 1-inch EMT or 3/4-inch Schedule 40 PVC. Wider structures of 20 to 30 feet should use 1.25-inch or 1.5-inch EMT or galvanized pipe for adequate snow and wind resistance. EMT conduit is generally preferred over PVC because it holds its shape better in heat and provides superior structural strength.
How far apart should hoop house hoops be spaced?
Standard hoop spacing is 4 feet on center for most residential hoop houses. In areas with heavy snow loads, reduce spacing to 3 feet for added structural support. For lightweight summer shade structures, 5 to 6 foot spacing is acceptable. The closer the spacing, the stronger the structure but the more materials and cost required. Most plans recommend 4-foot spacing as the best balance between strength and economy for year-round use.
How long does hoop house plastic last?
Standard 6-mil greenhouse polyethylene lasts 3 to 4 years with UV stabilization treatment. Budget 4-mil poly lasts 1 to 2 years. Premium 8-mil woven poly can last 5 to 6 years. SolaWrap and polycarbonate panels last 10 to 15 years or more but cost significantly more upfront. UV degradation is the primary cause of failure, so always use greenhouse-grade poly with UV inhibitors rather than construction-grade plastic sheeting, which can degrade within a single season.
What temperature difference does a hoop house provide?
A single-layer hoop house typically provides 10 to 20 degrees Fahrenheit of frost protection compared to outdoor temperatures. A double-layer inflated poly setup adds another 5 to 10 degrees. With row covers inside the hoop house, you can gain an additional 4 to 8 degrees for a total of up to 30 degrees of protection. This allows growing cold-hardy crops through winter in USDA zones 5 and above, and extends the season by 4 to 8 weeks in spring and fall.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.
Can I use Hoop House Calculator on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.