Stage 1 — weeks 0 to 6
The container barely matters. What matters is that it is big enough for week five, warm before the box arrives, and has a cool end.
By Scooter M.·Published September 1, 2026
The short answer
Size the brooder for week five, not week one — Penn State Extension publishes 1 square foot per bird at that age against a quarter of a square foot in week one. Bed it two to three inches deep, put the heat at one end only so there is a cool end, raise the feeder and drinker, and run it warm for several hours before the chicks arrive.
A brooder is a draft-free box you can keep warm at one end. Almost anything works: a large plastic storage tote, a stock tank, a cardboard appliance box, a sheet of hardboard bent into a ring. Purpose-built brooders exist and they are fine, but the money is better spent on the heat source.
Two requirements the container actually has to meet. It needs solid sides for the bottom foot or so, because chicks need shelter from drafts at floor level. And by week three it needs a lid or a cover of some sort, because they can fly a great deal earlier than people expect and a chick loose in a garage is a bad afternoon.
This is the single most common brooder mistake, and it is entirely avoidable because the numbers are published.
| Chicks | Week 1 (1/4 sq ft) | Weeks 3-5 (3/4 sq ft) | Weeks 5-8 (1 sq ft) |
|---|---|---|---|
| 6 | 1.5 sq ft | 4.5 sq ft | 6 sq ft |
| 10 | 2.5 sq ft | 7.5 sq ft | 10 sq ft |
| 15 | 3.75 sq ft | 11.25 sq ft | 15 sq ft |
| 25 | 6.25 sq ft | 18.75 sq ft | 25 sq ft |
Six chicks need a square foot and a half in week one and six square feet by week five — which is a container roughly two feet by three. A large storage tote is about that, which is why totes work for small broods and stop working for larger ones around week four.
Pine shavings, two to three inches deep, are the default and for good reason: absorbent, cheap, compostable and easy to top up. The considerations are depth, dust and the surface underneath.
Put the heat source at one end. This is not a stylistic choice — it is the whole mechanism by which chicks regulate their own temperature. A chick that is too warm walks away from the heat; a chick that is cold goes back. If the entire brooder is at 95 F they have nowhere to go, and you have removed their ability to correct your mistakes.
It also means the feeder and drinker belong at the cooler end, not under the plate. Warm water is unappealing and warm feed spoils faster.
Set it all up and run it for several hours, ideally the day before. Check 95 F at chick level at the edge of the warm zone with the heat on and the room at its normal temperature. Day-old chicks arriving into a brooder you are still adjusting is how the first day goes wrong, and shipped chicks in particular arrive tired and dehydrated with no margin for a cold hour.
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Heat, bedding and something to keep the water out of the shavings.
Brinsea
12 W
Twelve watts and a metal warming plate, which is the lowest published draw of any brooder plate we found and the reason it costs about two dollars to run a whole six-week brood.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
Small Pet Select
Triple-screened, 99% dust-free
Ordinary pine shavings with an unusual claim attached: triple-screened to 99 percent dust-free, which is the one bedding spec that matters in an enclosed brooder.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
RentACoop
Fits 1 L to 1 gal vessels
A raised stand that takes the feeder and drinker off the shavings, which is the single change that stops you refilling a waterer full of bedding three times a day.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
Size it for week five rather than week one. Penn State Extension publishes a quarter of a square foot per chick in week one rising to a full square foot at weeks five to eight, so six chicks need about a square foot and a half at the start and six square feet by the end — roughly a two-by-three-foot container.
Pine or aspen shavings, two to three inches deep. Avoid cedar, whose aromatic oils are a respiratory irritant, and avoid bare newspaper, which is too slick for young chicks and is associated with splayed leg. Low dust matters more in an enclosed brooder than anywhere else in chicken keeping.
No. Put the heat source at one end so there is a genuinely cooler area. That temperature gradient is how chicks regulate themselves — they move toward the heat when cold and away when warm. A uniformly heated brooder removes their ability to correct anything you have got wrong.
Yes, and plenty of successful broods happen in one. It needs solid sides at floor level to block drafts, a cover by around week three because chicks fly earlier than people expect, and replacing when it gets damp. The container is the least important part of a brooder; the heat source is the most.
Every figure cited on this page came from one of these documents. If one of them has changed since we read it, the number here is out of date and we would like to know.
Heat, feed, water and a thermometer for weeks zero to six, with the temperature schedule and the electricity math.
The full published brooding schedule — temperature, floor space, feeder and waterer allowance — week by week.
Chick drinkers, feeders and the raised-stand fix, sized with Penn State Extension's published space-per-chick figures.
Why packaged starter kits disappoint, and the five-item kit we would assemble instead for a first brood.
The two conditions that decide when chicks move outside, and the transition that avoids a setback.