Chicken Feed Calculator (Flock Daily & Annual)

Chicken Feed Guide

How Much Chickens Eat?

A standard laying hen eats roughly 100-150 grams of feed per day — commonly estimated at about 120g, or roughly a quarter of a pound. Over a year that's around 40-45 kg per hen. Quantities vary with bird size, breed, activity, weather (chickens eat more in cold weather to stay warm), and how much they forage. Rough daily guides: bantams (small breeds) eat less, around 60-80g. Standard laying hens around 100-130g. Large breeds (Orpingtons, Brahmas) more, around 150-180g. Growing pullets and meat birds (broilers) have different needs and feed types. For a typical backyard flock of 6 standard hens, that's roughly 700-800g of feed a day, around 5 kg a week, and somewhere around 250-270 kg a year — a useful figure for budgeting and for buying feed in cost-effective bulk. Chickens self-regulate reasonably well when fed a balanced complete feed available throughout the day (ad-lib feeding), so you generally provide constant access rather than strict rations. This calculator estimates flock consumption so you know how much to buy and what it will cost.

What should I know about Types of Feed?

Chickens need the right feed for their life stage. Chick crumb (starter): high-protein (around 18-20%) feed for chicks from hatching to several weeks old, in a fine crumb form. Often medicated to protect against coccidiosis (check if appropriate for your situation). Growers' pellets: lower protein (around 15-16%) for growing pullets from several weeks until they approach laying age — too much calcium too early can harm developing birds, so layers' feed is not given yet. Layers' pellets or mash: the staple for hens in lay, with around 16% protein and added calcium (around 3.5-4%) for strong eggshells. This is what most backyard laying hens eat. Pellets reduce waste; mash can be fed wet or dry. Complete feeds are formulated to provide balanced nutrition, so they should form the bulk of the diet. Supplements: grit (insoluble) helps chickens grind food in the gizzard, important for foraging birds. Oyster shell (soluble calcium) supports eggshell quality, offered separately so birds take what they need. Treats and kitchen scraps should be limited (no more than ~10% of intake) so they don't unbalance the complete feed — and some foods are unsafe for chickens.

What should I know about Foraging and Cost?

Free-ranging and foraging reduce how much commercial feed chickens need, while improving welfare and egg quality. Birds with garden access eat insects, seeds, greens, and grubs, which can cut feed consumption by roughly 10-20% in good foraging conditions (more in summer, less in winter when natural food is scarce). However, foraging alone rarely provides complete balanced nutrition for laying hens, so a complete feed should still be available — foraging supplements rather than replaces it. Cost management: buying feed in larger bags (20-25 kg) or in bulk is considerably cheaper per kg than small bags. Store feed in dry, vermin-proof, airtight containers (metal bins are ideal) to keep it fresh and protect it from rodents, which both eat and contaminate feed and are a serious problem around poultry. Reduce waste with good feeders (treadle or covered feeders deter wild birds and rodents and reduce spillage). Avoid leaving feed out overnight where it attracts vermin. Egg production economics: for backyard keepers, eggs rarely 'pay' purely on feed cost versus shop prices, but feed is the main running cost — this calculator helps you budget it realistically.

What do I need to know about Practical Feeding?

Good feeding practice keeps a flock healthy and productive. Constant access: provide complete feed available throughout the day; hens regulate their intake well. Ensure all birds can access feeders without bullying (provide enough feeder space, especially in larger or mixed flocks). Fresh water always: clean, fresh water is as important as feed — hens drink more than people expect, especially in heat and when laying, and water deprivation rapidly harms health and egg production. Calcium for layers: offer oyster shell or a layers' feed with adequate calcium for strong shells; thin or soft shells often indicate a calcium or vitamin D shortfall. Adjust for season: chickens eat more in winter (to generate body heat) and may eat less in extreme summer heat (when they need extra water and shade). Watch condition: monitor body condition and laying; sudden changes in appetite can signal illness or stress (and laying naturally drops in moult and short winter days). Hygiene: keep feeders clean and dry; mouldy or wet feed can cause illness. Transitions: change feed types gradually. This calculator gives feed quantities and cost for planning; for flock health, nutrition specifics, and any illness, consult a vet or experienced poultry keeper, and follow feed manufacturer guidance for your birds' life stage.

What should I know about Layer Feed and Calcium — Why Laying Hens Have Different Needs?

Hens actively laying eggs have a substantially higher calcium requirement than non-laying chickens, since each eggshell draws heavily on the hen's calcium reserves, and layer feed is specifically formulated with added calcium (often from crushed oyster shell or limestone) to meet this demand. Feeding a non-layer, all-flock, or chick starter feed to actively laying hens without supplementing calcium separately can lead to depleted bone calcium over time and weak or thin-shelled eggs. Conversely, young chicks and non-laying roosters shouldn't be fed layer feed long-term, since the excess calcium formulated for laying hens can cause kidney damage and skeletal problems in birds that aren't using it to produce eggshells. This is why mixed-age or mixed-sex flocks often need separate feeding stations, or an all-flock feed with calcium offered separately on the side (like free-choice oyster shell) so each bird can self-regulate its own calcium intake according to its actual needs.

Worked Example: Feed Budget for a Backyard Flock of Six Hens

A laying hen typically eats around 120-140g of complete layer feed per day when feed is available free-choice alongside some foraging, though actual intake varies with breed size, season (hens eat more in cold weather to maintain body temperature), and how much they supplement their diet by foraging.

Worked example: a backyard flock of 6 laying hens, each eating an average of around 130g of layer feed per day, needs roughly 780g (0.78kg) of feed per day for the whole flock, which adds up to approximately 5.5kg per week and around 23-24kg per month. A standard 20kg sack of layer feed would therefore last this flock a little under four weeks under typical conditions — less in winter when hens eat more to stay warm, and somewhat less if the flock also has generous access to free-range foraging, which can meaningfully offset purchased feed costs during spring and summer.

Why Does a Laying Hen's Calcium Need Differ So Much From a Non-Laying Bird's?

A hen producing an egg roughly every 24-26 hours is depositing a substantial amount of calcium into each eggshell, which is almost pure calcium carbonate — this ongoing demand means a laying hen's dietary calcium requirement is dramatically higher than that of a non-laying chicken, a chick, or most other birds of similar size.

This is why layer feed is formulated with substantially more calcium (typically around 3.5-4.5%) than grower feed or all-flock feed, and why chicks and non-laying birds should not be fed layer feed long-term — the excess calcium can be harmful to their kidneys and skeletal development. Offering free-choice oyster shell or a similar calcium supplement alongside a complete layer feed lets each hen top up calcium intake to match her own individual egg production rate, which is particularly useful in a mixed-age flock where some birds are laying heavily and others are not laying at all.

Feed Formulation Comparison by Life Stage

Commercial poultry feed isn't one product — starter, grower and layer feeds are formulated with deliberately different protein and calcium levels to match a bird's changing needs, and feeding the wrong one for too long can cause real harm.

Feeding layer pellets (high calcium) to young, non-laying birds can cause kidney damage over time, while feeding grower feed (low calcium) to laying hens leads to thin shells and depleted bone calcium — matching feed to life stage matters as much as matching the total daily quantity.