🪵 Homestead Sizing Engine

Chicken Coop Size Calculator for 12 Chickens

Twelve hens require substantial airflow and dedicated roosting bars to prevent bullying and moisture accumulation. Calculate your specifications below.

🐔 University Agricultural Standards

Chicken Coop Ventilation & Sizing Calculator

Moisture & Ammonia Prevention

1. Number of Chickens in Flock12 Birds

2 Hens6 Hens (Backyard)12 Hens24 Hens40 Hens

2. Chicken Breed Size

3. Regional Climate

Cold Northern ClimateFocus on draft-free top exhaust

Warm / Southern ClimateMaximum cross-breeze cooling

Total Ventilation Required

--sq. inches

-- sq. feet

High 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 big of a coop do I need for 12 chickens?

A 12-chicken flock requires a minimum 48 sq ft coop (such as an 6ft × 8ft shed), with at least 12 feet of roosting bar space and 3 to 4 nesting boxes.