Small flock calculators
Free calculators for backyard chickens, quail and ducks
How big should the coop be? How many hens do you actually need? What does a home-laid egg really cost? Get the answers in seconds — straight from extension-service numbers.
The calculators
Pick your calculator
Fourteen tools, one job — the right space for your birds, the true cost of your eggs, and a hatch you can plan to the day. The five most-used, first:
Floor space for Coturnix quail — plus how many fit in your cage.
CalculateChickensHow Many Chickens Do I Need?Eggs your household eats → hens you actually need, buffer included.
CalculateEgg costsCost Per Egg CalculatorYour real cost per egg and per dozen, feed counted.
CalculateDucksDuck Coop Size CalculatorCoop and run space for ducks — no roosts, splash zones planned.
CalculateChickensChicken Coop Size CalculatorCoop, run, roost and boxes for bantam to large breeds.
CalculateEvery calculator runs entirely in your browser. Nothing you type is sent anywhere, stored, or tracked.
Try oneAll the calculators
Every tool, one page
Housing, feed, eggs and hatching — the complete set of fourteen, all free and all instant.
Floor space for Coturnix quail — and how many fit your cage.
CalculateChickensHow Many Chickens Do I Need?Eggs you eat → hens you need, buffer included.
CalculateEgg costsCost Per Egg CalculatorYour real cost per egg and per dozen, feed counted.
CalculateDucksDuck Coop Size CalculatorCoop and run for ducks — no roosts, splash zones planned.
CalculateChickensChicken Coop Size CalculatorCoop, run, roost and boxes for bantam to large breeds.
CalculateEgg productionEgg Production CalculatorEggs per week, month and year from your flock's laying rate.
CalculateFeedChicken Feed CalculatorDaily and monthly feed amounts, bags and cost for your flock.
CalculateQuailHow Many Quail Do I Need?Eggs you want → quail hens and cage space you need.
CalculateChickensChicken Run Size CalculatorRun area, buildable dimensions and fencing length.
CalculateHatchingHatch Date CalculatorHatch day, lockdown and candling dates for five species.
CalculateCoop kitNesting Box & Roost CalculatorBoxes at 1 per 4 hens, roost at 10 inches per bird.
CalculateDucksHow Many Ducks Do I Need?Eggs you want → duck hens, coop and run you need.
CalculateQuail feedQuail Feed CalculatorQuail feed per day and month, in grams and pounds.
CalculateChicksBrooder Size CalculatorBrooder space week by week, plus the heat schedule.
CalculateSpace rates
Rates at a glance
The planning figures every calculator on this site uses — per bird, no surprises.
| Bird | Coop per bird | Run per bird | Feed per day |
|---|---|---|---|
| Chicken (standard) | 3.5 sq ft | 10 sq ft | 0.25 lb/day |
| Chicken (bantam) | 2 sq ft | 6 sq ft | — |
| Duck (standard) | 4 sq ft | 10–15 sq ft | — |
| Quail (Coturnix) | 1 sq ft | Not needed | — |
Feed figure is for a laying hen — the standard planning rate of about 0.25 lb a day (7.5 lb a month).
How it works
Three steps. Sixty seconds.
Enter your birds
How many birds, and what size — bantam, standard or large. Ten seconds, no account, nothing leaves your browser.
Get your sizes
Coop and run area, roost length, nesting boxes — in square feet and square metres, updating as you type.
Build with confidence
Copy or print the numbers for your build or shopping list, sized to the figures extension services recommend.
How our numbers work
Every figure on this site comes from published poultry-keeping guidance — the same space allowances taught by university extension services (such as the poultry programmes at US land-grant universities and extension.org) and UK poultry welfare organisations. In short:
- Quail: about 1 sq ft of floor space per Coturnix bird (0.75 sq ft absolute minimum, 1.25 sq ft roomy).
- Chickens: 3.5–4 sq ft of coop and 10 sq ft of run per standard bird, 10 inches of roost each, one nesting box per four hens.
- Ducks: 4 sq ft of coop and 10–15 sq ft of run per standard duck, ground-level nesting, no roosts.
- Feed: a laying hen eats roughly 0.25 lb of feed a day — about 7.5 lb a month — the standard planning figure used by feed companies and extension guides.
Rules and minimums vary by country and council, and these tools give planning guidance, not legal advice. When a range exists, we show it honestly and let you choose.
Frequently asked questions
Are these calculators free?
Yes — every calculator on FlockCalc is completely free, with no sign-up, no email wall and no limits. Your numbers never leave your browser; each tool runs entirely on the page.
Where do the space numbers come from?
From mainstream poultry guidance published by university extension services and poultry organisations in the US and UK: roughly 1 sq ft per Coturnix quail, 3.5–4 sq ft of coop space and 10 sq ft of run per standard chicken, and 4 sq ft per duck. Each calculator shows the exact figures it uses so you can check them.
Should I build to the minimum or the recommended size?
Minimums keep birds legally housed; recommended sizes keep them calm. Crowding is the top cause of feather-pecking, stress and disease in backyard flocks, so if you can afford the space, choose the recommended or roomy option every time.
Do the calculators work in metric?
Yes. Every area result is shown in both square feet and square metres, and roost lengths in feet and metres, so the tools work wherever you keep birds.
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Size it before you build it
A coop built to the wrong number costs lumber and unhappy birds. Sixty seconds with a calculator first is cheaper.