Quick answer: A full-grown laying hen eats roughly 0.25 lb (about 120 grams) of feed per day, or 1.5-1.75 lb per week. Multiply that by your flock size and the number of days you’re feeding to get total pounds needed, then multiply by your feed’s price per pound (or per bag) to get your feed budget. Chicks and growing pullets eat less per bird; use the calculator below to get a number matched to your flock’s age and size.
One of the most common surprises for new backyard chicken keepers is how much feed actually costs over a year compared to what they expected when they first got chicks. A small flock of three or four hens feels almost free to feed month to month, but once you scale up to a dozen or more birds – or add a mixed-age flock with chicks, pullets, and layers all eating different rations at once – the monthly feed bill can catch you off guard. Feed is consistently the single biggest ongoing cost of keeping backyard chickens, easily outweighing the cost of the coop, bedding, and vet care combined over the life of the flock.
Getting an accurate feed estimate matters for two reasons. First, it lets you budget properly instead of guessing and running short mid-month. Second, it helps you plan how many 50 lb bags to buy at once, which matters for storage space and for taking advantage of bulk pricing at your local feed store. Below you’ll find a full breakdown of feed needs by age and breed size, a second worked example for a larger flock, an explanation of why feed intake varies so much by season and bird type, and practical tips for keeping your feed costs down without shortchanging your birds.
Backyard Chicken Feed Calculator
How Much Feed Does a Chicken Eat?
Feed intake depends mostly on age and purpose. A general formula is:
Total feed = Number of birds x Feed per bird per day x Number of days
Layers eating a balanced 16-18% protein layer feed average about 0.25 lb (roughly 1/2 cup by volume) per bird per day, though larger heritage breeds eat somewhat more and bantams eat less.
Worked Example
For a flock of 6 adult layers over a 30-day month: 6 birds x 0.25 lb/day x 30 days = 45 lb of feed. At $22 per 50 lb bag ($0.44/lb), that’s about $19.80 per month, or a little under one bag.
Feed Needs by Life Stage
| Stage | Age | Feed/bird/day | Protein % |
|---|---|---|---|
| Chick starter | 0-8 weeks | 0.04-0.08 lb | 18-20% |
| Grower/pullet | 8-20 weeks | 0.10-0.20 lb | 16-18% |
| Layer | 20+ weeks | 0.22-0.28 lb | 16-18% |
| Broiler (meat) | Grow-out period | 0.30-0.45 lb | 20-24% |
Monthly Feed Cost by Flock Size (Adult Layers)
| Flock Size | Feed/month (lb) | Approx cost/month* |
|---|---|---|
| 3 hens | 22.5 lb | $9.90 |
| 6 hens | 45 lb | $19.80 |
| 12 hens | 90 lb | $39.60 |
| 25 hens | 187.5 lb | $82.50 |
*Based on $22 per 50 lb bag ($0.44/lb); adjust for your local feed price.
A Second Worked Example: A Mixed-Age Flock
Real backyard flocks rarely consist of birds all the same age. Say you have 4 adult layers, 3 pullets in the grower stage, and 5 new chicks, and you want to budget for a 30-day month. The layers eat 4 x 0.25 lb x 30 days = 30 lb. The pullets eat 3 x 0.15 lb x 30 days = 13.5 lb. The chicks eat 5 x 0.06 lb x 30 days = 9 lb. Total feed needed across all three groups: 52.5 lb for the month. At $22 per 50 lb bag ($0.44/lb), that’s about $23.10 for the month, and you’d need just over one full bag to cover it. Because each group eats a different formulated feed (starter, grower, layer), you’ll actually be buying three separate bags rather than one – so run this calculator separately for each age group in your flock, then add the totals together for your full budget.
Why Feed Intake Varies So Much
The per-bird averages used in this calculator are solid starting points, but several factors push actual consumption up or down in practice. Breed size is the biggest one – a large-bodied breed like a Jersey Giant or Brahma can eat noticeably more than the 0.25 lb/day average, while bantam breeds eat a fraction of that. Season matters almost as much: chickens eat more in cold weather because they burn extra calories regulating body temperature, and less in hot weather when they’re not laying as heavily and are trying to stay cool. Activity level plays a role too – birds with access to a large run or pasture that lets them forage for bugs, seeds, and greens will eat somewhat less purchased feed than birds confined to a small coop and run. Finally, feed waste from spillage and scratching can add 5-10% to your effective consumption if you’re using an open feeder rather than a treadle or hanging feeder that limits spillage.
Common Mistakes to Avoid
- Feeding all ages the same ration. Chick starter, grower, and layer feed have different protein and calcium levels formulated for each life stage. Feeding layer feed (high calcium) to chicks can damage their kidneys, while feeding chick starter to layers won’t support proper egg production.
- Underestimating winter feed needs. Many new keepers budget based on summer consumption and then run short in December and January when birds need 10-20% more feed to stay warm.
- Assuming free-ranging eliminates the feed bill. Foraging supplements a diet but rarely replaces more than 20-30% of it, especially for birds that need consistent nutrition to keep laying well.
- Letting treats crowd out balanced feed. Scratch grains, table scraps, and produce are fun for the birds but should stay under 10% of total intake, or you risk nutritional deficiencies and dropped egg production.
- Not accounting for feed waste. Open trough feeders let birds scratch and spill a surprising amount of feed onto the ground. Switching to a treadle or hanging feeder often cuts consumption noticeably just by reducing waste.
Tips for New Backyard Chicken Keepers
- Buy feed in the largest bag size your storage allows. A sealed metal trash can or dedicated feed bin keeps a 50 lb bag fresh and rodent-proof, and buying larger bags is almost always cheaper per pound than smaller ones.
- Transition between feed stages gradually. Mix old and new feed together over 5-7 days when moving a flock from starter to grower to layer feed, to avoid digestive upset.
- Offer free-choice oyster shell alongside layer feed rather than mixing it directly in, so hens can self-regulate calcium intake based on their own laying needs.
- Re-run this calculator whenever your flock composition changes – after a hatch, after adding new pullets, or after birds transition between life stages – so your feed budget and bag-buying stay accurate.
- Track your actual monthly feed spend for a season and compare it to the calculator’s estimate. Small adjustments for your specific breed mix and climate will make future estimates even more accurate.
Frequently Asked Questions
Q: Do chickens need extra feed in winter?
A: Yes, typically 10-20% more, since birds burn extra calories staying warm in cold weather.
Q: Does free-ranging reduce how much feed I need to buy?
A: It can reduce it somewhat since birds forage for bugs and greens, but free-ranging alone rarely covers a full diet, especially for egg production, so plan for at least 70-80% of normal feed amounts.
Q: How much water do chickens drink?
A: About 0.5-1 liter (roughly 2-4 cups) per bird per day, more in hot weather or during heavy laying.
Q: Should I feed layer pellets or crumble?
A: Both provide the same nutrition; pellets waste less feed since chickens can’t pick around them, while crumble is sometimes preferred for younger or smaller birds.
Q: Do treats and scraps count against their feed budget?
A: Treats and kitchen scraps should stay under 10% of total diet; too many treats dilute the balanced nutrition in layer feed and can reduce egg production.
Q: How many eggs will 6 hens produce per week?
A: A healthy laying hen typically lays 4-6 eggs per week, so 6 hens could produce roughly 24-36 eggs weekly depending on breed, age, and season.
Q: Why do bantam breeds eat less?
A: Bantams are roughly one-quarter to one-third the size of standard breeds, so their feed intake scales down proportionally, often around 0.10-0.15 lb per day.
Q: Is buying feed in bulk cheaper?
A: Yes, buying 50 lb bags instead of smaller bags, or buying a pallet from a feed co-op, commonly saves 15-25% per pound.
Conclusion
Knowing your flock’s feed needs helps you budget accurately and avoid running out mid-month. Use the calculator above whenever your flock size changes or you switch between chick, grower, layer, or broiler feed to get an updated estimate in seconds. This is especially useful heading into winter, when consumption jumps, or whenever you add new birds to an existing flock and need to recalculate your monthly bag count.
Backyard chicken keeping is supposed to be rewarding, not a source of budget stress. A five-minute calculation each season keeps your feed costs predictable and helps you decide whether buying in bulk, switching feed brands, or adjusting your flock size makes sense for your situation.