First flock planner
A six-step plan from I want to keep chickens to I have a flock and a working coop. Each step anchors on the underlying calculator — household-to-flock, coop size, run size, ventilation, monthly cost, brooder setup. No fluff. The numbers come from the same engines as the standalone tools; this page just sequences them.
The 6-step plan
- 1
How many chickens for your household?
Most US households eat 4–6 eggs per person per week. A productive backyard hen lays roughly 5–6 eggs per week in her peak year — call it 4–5 eggs/week per hen averaged across the year (winter slowdowns, molt pauses, and aging factor in). Divide your household's weekly egg demand by ~4 to land on a reasonable flock size. Below 3 birds isn't viable — chickens are flock animals.
Realistic egg yields by breed → - 2
How big a coop do you need?
4 sq ft of indoor coop floor per standard hen (5 sq ft for heavy breeds, 2 sq ft for bantams). Roost length: 8–12 inches per bird. Nest boxes: 1 per 4 hens, minimum of 2. The HatchMath coop size calculator runs the math for any combination of flock size and breed mix.
Coop size calculator → - 3
How big a run?
10 sq ft of outdoor run per bird is the standard target — 8 sq ft is tight (fine for cold climates with seasonal use), 12+ sq ft is generous (better for hot climates and full-confinement flocks). Run height: 6 ft if you want walk-in access, 4 ft minimum otherwise. Predator-rated roof is non-optional.
Run size by flock → - 4
How much ventilation?
Roughly 1 sq ft of vent area per 10 sq ft of coop floor area, climate-adjusted. Cold climates run 0.6–0.8× of that; hot climates 1.4–1.6×; humid climates 1.2–1.4×. Half goes high (above roost), half goes low (windward intake). Sealed coops fail in winter from condensation, not from cold.
Ventilation calculator → - 5
What will it cost per month?
Layer feed at 16–18% protein runs ~$15–18 per 50-lb bag at 2026 retail. A 6-hen flock eats roughly 60 lb/month, costing $20–35 in feed. Add bedding ($5–10), oyster shell ($1), and occasional treats. Total feed + bedding monthly: ~$30–50 for a 6-bird flock. One-time setup (coop + run + waterers + feeders + first chicks): $400–1,500 depending on build vs buy.
Feed amount + cost calculator → - 6
Are you starting with chicks or pullets?
Chicks: cheapest ($3–8 each at hatchery), maximum imprinting time, but 6+ weeks in a brooder before they can move to the coop. You'll need a heat source (250W lamp or brooder plate), a tub or stock tank, chick starter feed, and time to monitor. Pullets (16–20 weeks old, almost-laying): $20–35 each, no brooder phase, eggs within 2–6 weeks. Most first-time keepers find pullets easier; chicks are better for the experience.
Brooder heat-lamp wattage →
Worked plans by household size
Pre-computed end-to-end plans for the four most-common starting situations. Numbers come directly from the calculator engines at standard breed class + temperate climate. Adjust for your own breed mix and climate using the underlying calcs linked in each row.
1–2 person household
Eggs/week needed
8–14
Recommended flock
3 hens
Coop size
4×4 (16 sq ft)
Run size
30–36 sq ft
Vent area (temperate)
1.4–1.8 sq ft (temperate)
Monthly feed
$15–25
Total monthly cost (est.)
$25–40
Smallest viable flock. Hens are flock animals — never keep just one. Three is the practical minimum.
3–4 person household
Eggs/week needed
16–28
Recommended flock
5–6 hens
Coop size
4×6 to 4×8 (24–32 sq ft)
Run size
50–60 sq ft
Vent area (temperate)
2.2–3.5 sq ft (temperate)
Monthly feed
$30–45
Total monthly cost (est.)
$45–65
The sweet spot for most US households. Plymouth Rocks, Sex-Links, or a 50/50 mix.
5–6 person household
Eggs/week needed
28–42
Recommended flock
8 hens
Coop size
4×8 to 6×8 (32–48 sq ft)
Run size
80–96 sq ft
Vent area (temperate)
2.9–4.3 sq ft (temperate)
Monthly feed
$50–70
Total monthly cost (est.)
$65–95
Larger flocks need taller coops (walk-in 6+ ft) for maintenance ergonomics.
Sharing or selling surplus
Eggs/week needed
40+
Recommended flock
10–12 hens
Coop size
6×8 to 8×8 (48–64 sq ft)
Run size
100–144 sq ft
Vent area (temperate)
4.3–5.8 sq ft (temperate)
Monthly feed
$70–95
Total monthly cost (est.)
$90–125
At this size, predator-proofing and a structured cleaning cadence become non-optional.
End-to-end timeline (chick → first eggs ~22 weeks)
From buying chicks to collecting your first eggs is roughly 22 weeks. The phase-by-phase actions:
Pre-purchase (4–8 weeks before chicks)
- Build or buy the coop + run; verify ventilation by calculator
- Add hardware-cloth predator-proofing on every opening
- Set up brooder space (basement, garage, spare room — NOT the coop)
- Pick breeds: production hybrid, heritage dual-purpose, or mixed flock
- Order chicks from a hatchery or pick up at a feed store in chick days
Brooder phase (weeks 1–6)
- 95°F under the lamp in week 1; drop ~5°F per week
- Chick starter feed (20%+ protein) free-choice
- Fresh water daily; clean waterer every 2–3 days
- Monitor chick behavior: huddled = too cold, scattered = too hot
- Pine shavings bedding refresh as needed
Move to coop (weeks 6–8)
- Confirm chicks fully feathered before transition
- Confirm overnight low above 50°F (or supplement heat for first week)
- Switch from chick starter to grower feed
- Watch flock dynamics for the first 1–2 weeks of integration
Point of lay (weeks 18–24)
- Switch to layer feed + offer oyster shell free-choice
- Add dummy eggs to nest boxes (redirects floor-laying)
- Watch for the squat behavior — first eggs follow within 1–2 weeks
- Expect small/irregular eggs for the first 4–8 weeks of laying
Starting with point-of-lay pullets instead of chicks removes the brooder phase and cuts the timeline to first egg from ~22 weeks to ~2–6 weeks (basically: buy a 16–20 week pullet, give her a week or two to settle into the coop, then she lays).
What this planner doesn't cover
- Local zoning + HOA rules. Backyard chicken ordinances vary widely. Check your municipality before buying chicks; some cities restrict roosters, others limit flock size, others ban backyard poultry entirely.
- Veterinary care. This planner is calculator math, not health management. For sick birds, parasites, egg-bound emergencies, or any clinical question, consult an avian or livestock veterinarian, or your county Cooperative Extension office.
- Breed selection by personality. The flock counts here assume any productive backyard breed. Specific breed picks (heat-tolerant, broody, friendly, dark-egg-laying, etc.) are reader judgment — see breed catalogs and hatchery guides.
- Predator profile. Ground predators (foxes, coyotes, dogs, raccoons) and aerial threats (hawks, owls) shape the run + coop build. The numbers here assume standard backyard predator-proofing; rural high-pressure sites may need more.
Use the calculators directly
This planner sequences the four HatchMath calculators. Run any of them on its own with your specific inputs:
By Jimmy L Wu. Numbers throughout — flock counts, coop dimensions, vent areas, feed costs, brooder watts — pull directly from the four HatchMath calculator engines (coop size, ventilation, feed amount, brooder). The 4-sq-ft indoor coop figure and 8–12 in roost spacing reflect Damerow's Storey's Guide to Raising Chickens; the 1:10 vent ratio + climate multipliers are HatchMath methodology; the 16–18% layer protein and 95°F brooder week-1 spec are UMN Extension. 2026 retail pricing for feed and one-time setup costs reflects average US distribution. Not veterinary advice — for any animal-health question, consult an avian or livestock veterinarian, or your county Cooperative Extension office.