A 50 lb bag of feed lasts most small backyard flocks somewhere between a couple of weeks and a couple of months, depending on how many birds you keep. Knowing the number helps you buy the right bag size, avoid running out, and spot when waste is eating into your supply. Here's how to work it out for your flock.
Quick answer
A 50 lb bag of layer feed lasts about a month for six laying hens, or about two months for three hens. A standard hen eats roughly 0.27 lb a day including waste, so you can scale the bag to any flock size from there.
How long does a 50 lb bag last?
It comes down to how many birds you have. A standard laying hen eats about a quarter-pound of feed a day, and once you add normal waste that's closer to 0.27 lb per bird per day. Divide a 50 lb bag by your flock's daily total and you get the number of days it lasts. The table below does that math for common flock sizes.
| Flock size | A 50 lb bag lasts | Bags per month |
|---|---|---|
| 3 hens | ~62 days (about 2 months) | ~0.5 bag |
| 4 hens | ~47 days | ~0.65 bag |
| 6 hens | ~31 days (about 1 month) | ~1 bag |
| 10 hens | ~19 days | ~1.6 bags |
| 15 hens | ~12 days | ~2.4 bags |
| 25 hens | ~7 days | ~4 bags |
For an exact figure using your own flock size, feed price, and bag weight, the feed cost calculator shows how long each bag lasts along with your monthly cost.
How to calculate it for your flock
The formula is simple: bag weight divided by (number of birds times daily feed per bird). For a 50 lb bag and six hens at 0.27 lb a day each, that's 50 divided by 1.6, which is about 31 days. Use 0.10 lb a day for young chicks and about 0.33 lb for meat birds, since they eat different amounts. For the amounts at each life stage, see our chicken feeding chart by age.
What makes a bag last longer or shorter
Several everyday things move the number:
- Feed waste. The biggest hidden factor. Feed spilled from a poorly-hung feeder or spoiled by damp can quietly cut a bag's life short. A spill-proof feeder is the easiest fix.
- Free-ranging. Birds that forage eat less purchased feed, so a bag stretches noticeably further.
- Season. Chickens eat about 10% more in cold weather, so bags empty faster in winter.
- Bird size and breed. Large breeds eat more per bird than bantams, shortening the bag; smaller breeds lengthen it.
How many bags do you need to buy?
Work backward from how long a bag lasts. Six hens going through about one 50 lb bag a month means monthly restocking. A larger flock that empties a bag every week or two might justify buying two bags at a time, but only if you can store feed dry and pest-proof, since feed is best used within a month or two of opening. Buying more than you'll finish in time trades a small bulk discount for spoiled, lower-nutrition feed.
Key takeaways
- A 50 lb bag lasts about a month for six hens, two months for three hens.
- Formula: bag weight divided by (birds times about 0.27 lb per day).
- Feed waste is the biggest reason a bag runs out early; a spill-proof feeder helps most.
- Free-ranging stretches a bag; winter and large breeds shorten it.
- Buy a bag size your flock finishes within a month or two to keep feed fresh.
Once you know how long a bag lasts, it's easy to plan your feed budget. Run your exact numbers in the feed cost calculator, and see the full picture in our guide to how much it costs to feed chickens. To make each bag go further, read how to save money on chicken feed.
Frequently asked questions
How long does a 50 lb bag of chicken feed last?
For six standard laying hens, about a month. A hen eats roughly 0.27 lb of feed a day including waste, so six hens go through close to 48 lb in 30 days, just under one 50 lb bag.
How long does a bag of feed last for 3 chickens?
About two months. Three hens eat around 24 lb a month including waste, so a single 50 lb bag lasts them roughly 60 days.
How many bags of chicken feed do I need per month?
For six hens, about one 50 lb bag a month. Scale it with your flock: three hens need about half a bag, ten hens need closer to one and a half bags, and fifteen hens go through nearly two and a half bags a month.
Why is my feed running out faster than expected?
Usually feed waste. Feed kicked out of the feeder, spilled, or spoiled by damp disappears fast and is easy to underestimate. Winter and larger or free-loading birds also raise consumption. A spill-proof feeder is the quickest fix.
Does feed go bad if a bag lasts too long?
Yes. Chicken feed is best used within about a month or two of opening, and stored dry and pest-proof. Old or damp feed loses nutrients and can grow mold, so buy a bag size your flock will finish in a reasonable time.