🪵 Homestead Sizing Engine
Chicken Coop Ventilation Calculator
Proper ventilation is the single most important factor in keeping backyard chickens healthy during winter. Calculate total vent area and 50/50 gable vent placement.
🐔 University Agricultural Standards
Chicken Coop Ventilation & Sizing Calculator
Moisture & Ammonia Prevention
8 Birds
2 Hens6 Hens (Backyard)12 Hens24 Hens40 Hens
Total Ventilation Required
--sq. inches
-- sq. feetHigh Outlets (Gables):-- sq. in.
Low Inlets (Intake):-- sq. in.
Min. Coop Floor Space:-- sq. ft.
Continuous CFM Airflow:-- CFM
🛡️ Predator-Proofing & Airflow Rules
- • Never use chicken wire: Raccoons and weasels tear through chicken wire. Cover all vents with 1/2" 19-gauge welded wire mesh.
- • Keep vents ABOVE roost bars: Ammonia and moisture rise. Vents placed high in the roofline prevent cold drafts blowing on sleeping birds.
Frequently Asked Questions
How much ventilation does a chicken coop need?
University agricultural guidelines recommend roughly 144 square inches of vent area (1 square foot) for every 10 square feet of coop floor space, or roughly 1 sq. ft. per 4 to 5 adult hens.
Why is ventilation more important than warmth in winter?
Chickens handle cold temperatures well, but their droppings and breath produce immense moisture and ammonia. Without high roofline vents, moisture condenses on combs and wattles, causing severe frostbite.