Hoop House Calculator

Estimate the materials for a simple hoop (polytunnel) greenhouse.

How the Math Works

The Hoop House Calculator uses the formula for a semicircle's perimeter to determine the amount of material needed for each hoop. Since a hoop house structure uses curved arches, we calculate half the circumference of a circle (pi times radius) plus the diameter for the base. This ensures accurate measurement of plastic sheeting and metal or wooden hoops required for each section of your greenhouse structure.

Practical Applications

To use this calculator, measure the width you want for your hoop house, which becomes your diameter. Half this measurement is your radius. Input these dimensions, and the calculator will output the exact linear footage of plastic sheeting and number of hoops needed for your specific structure size. You can then multiply these measurements by the number of hoops you plan to install for your entire project.

Day-to-Day Use

This calculator saves time and money when building or repairing a hoop house by preventing material waste and shortages. Whether you're a weekend gardener extending your growing season or a farmer protecting crops from frost, you'll know exactly how much PVC piping, wire, and plastic sheeting to purchase. This prevents multiple trips to the hardware store and ensures you have enough materials to complete your project in one go.

Worked example

20 × 12 ft → ~18.8 ft hoops.

FAQ