Chicken Feed Calculator: How Much Feed Does Your Flock Need?

Whether you're raising a small backyard flock or caring for dozens of chickens, knowing how much feed to purchase can make your daily routine easier and help you manage your poultry expenses.

Our chicken feed calculator helps you estimate the amount of feed your chickens need per day, week, and month. With a few simple calculations, you can plan feed purchases, estimate costs, and avoid running out unexpectedly.

In this guide from Chatham Farm Feed & Supplies, you'll learn how to calculate chicken feed requirements, understand feeding differences between chickens of different ages, and make practical choices for your flock.

How Much Feed Does a Chicken Eat Per Day?

An average adult laying hen typically consumes approximately 0.25 lb (113 grams) of complete chicken feed per day.

Actual consumption depends on breed, body size, age, weather, laying activity, and the type of feed provided.

For example:

• 1 laying hen: approximately 0.25 lb per day

• 5 laying hens: approximately 1.25 lb per day

• 10 laying hens: approximately 2.5 lb per day

• 20 laying hens: approximately 5 lb per day

• 50 laying hens: approximately 12.5 lb per day

  
  

These figures are planning estimates, not strict feeding limits. Most backyard laying flocks should have continuous access to an appropriate complete feed and fresh, clean water.

Chicken Feed Calculator: Calculate Your Flock's Feed Requirements

You can estimate feed consumption using a simple formula:

Daily Feed Needed (lb) = Number of Chickens × Feed per Chicken per Day (lb)

For a flock of 12 adult laying hens:

12 × 0.25 lb = 3 lb of feed per day

To estimate weekly feed consumption:

3 × 7 = 21 lb per week

To estimate feed consumption for a 30-day month:

3 × 30 = 90 lb per month

This provides a practical starting point for feed purchasing and budgeting.

Chicken Feed Calculator Formula

Use these three formulas for your own flock:

Daily Feed: Number of chickens × Daily feed per bird

Weekly Feed: Daily feed × 7

Monthly Feed: Daily feed × 30

You can also estimate how many feed bags you'll need:

Number of Bags = Total Feed Required ÷ Feed Bag Weight

Always round up when purchasing whole bags.

Chicken Feed Chart: Daily, Weekly, and Monthly Amounts

The following table provides estimated complete feed requirements for standard adult laying hens.

Number of Chickens	Daily Feed	Weekly Feed	Monthly Feed (30 Days)
1	0.25 lb	1.75 lb	7.5 lb
5	1.25 lb	8.75 lb	37.5 lb
10	2.5 lb	17.5 lb	75 lb
15	3.75 lb	26.25 lb	112.5 lb
20	5 lb	35 lb	150 lb
25	6.25 lb	43.75 lb	187.5 lb
50	12.5 lb	87.5 lb	375 lb
100	25 lb	175 lb	750 lb

These figures assume an average consumption of 0.25 lb per adult laying hen per day. Individual flocks may consume more or less.

How Much Feed Do Baby Chicks, Pullets, and Adult Chickens Need?

Chickens require different feeding programs at different stages of life.

Baby Chicks (0–6 Weeks)

Newly hatched chicks eat relatively small quantities that increase as they grow.

Provide an age-appropriate complete chick starter feed and fresh water. Rather than relying on one fixed daily amount for the entire six-week period, follow the feed manufacturer's guidance and monitor consumption.

Growing Pullets (Approximately 6–20 Weeks)

Pullets gradually increase feed consumption as they develop.

A complete grower or developer ration appropriate to their age helps meet their changing requirements. Feed quantities vary by breed, age, and body size.

Adult Laying Hens (Approximately 18–20 Weeks Onward)

For planning purposes, an adult laying hen commonly consumes approximately 0.25 lb of complete feed daily.

Laying hens should receive a suitable layer feed formulated for their production stage, with enough feeder space and continuous access to clean drinking water.

Broiler Chickens

Broilers have different growth patterns and feeding needs than laying hens.

Their daily feed consumption increases rapidly with age. Use a broiler-specific feeding schedule, following the recommendations provided for the breed or strain and the selected feed.

A standard adult layer feed estimate should not be used to plan an entire broiler growing cycle.

How Long Does a 50 lb Bag of Chicken Feed Last?

The number of days a 50 lb bag lasts depends on your flock size and average daily consumption.

Use this formula:

Days of Feed = Bag Weight ÷ Daily Flock Consumption

For adult laying hens consuming an average of 0.25 lb each per day:

Flock Size	Estimated Days per 50 lb Bag
5 chickens	40 days
10 chickens	20 days
15 chickens	13.3 days
20 chickens	10 days
25 chickens	8 days
50 chickens	4 days

For example, if you have 10 laying hens, your flock may consume around 2.5 lb daily.

A 50 lb bag would therefore last approximately 20 days, assuming little waste.

How to Calculate Monthly Chicken Feed Costs

Feed expenses are an important part of backyard chicken keeping.

You can estimate your monthly feed budget using the price of your preferred chicken feed.

Monthly Feed Cost = Monthly Feed Needed (lb) × Feed Price per lb

For example, assume you have:

• 12 adult laying hens

• 0.25 lb daily consumption per bird

• A 50 lb feed bag priced at CAD $30

  
  

Your flock consumes approximately 90 lb every 30 days.

The estimated feed price per pound is:

$30 ÷ 50 = $0.60

Your monthly consumption cost is:

90 × $0.60 = CAD $54

Because feed is purchased in full bags, buying enough for that month would require two 50 lb bags, costing CAD $60 upfront.

The $30 bag price is an illustration, not a current product price.

What Factors Affect Chicken Feed Consumption?

Several factors influence how much feed chickens consume.

Breed and Body Size

Smaller chickens generally consume less feed than larger breeds. Bantams, standard laying hens, and heavy breeds may have different daily requirements.

Age and Growth Stage

Chicks, growers, layers, and broilers require different feeding programs. Feed amounts should reflect the birds' stage of development.

Weather and Seasonal Changes

Chickens may consume more feed in cold conditions as their energy needs change. Hot weather can reduce appetite.

Free-Range Activity

Chickens that forage outdoors may consume insects, plants, and other available materials. However, foraging should not be assumed to replace a complete, appropriately formulated feed.

Feed Waste

Feed spilled onto the ground or scattered outside feeders can increase feed purchases without increasing the amount actually consumed.

6. Feed Type and Quality

Pellets, crumbles, mash, and grain mixes differ in physical form and intended use.

Follow the selected feed's label directions and choose an appropriate complete ration for the flock.

How to Reduce Chicken Feed Waste

Reducing unnecessary waste can make feed purchasing more predictable.

Use suitable feeders: Choose feeders that limit excessive scratching and spillage.

Adjust feeder height: Position feeders appropriately for your chickens' size and ensure every bird has adequate access.

Keep feed dry: Store feed in a clean, dry, secure container away from excess moisture.

Monitor daily consumption: Check how much feed is offered, how much remains, and whether excessive feed is being spilled.

Avoid overfilling feeders: Follow the feeder manufacturer's directions to minimize unnecessary waste.

Choose feed appropriate for the flock: Select products intended for your chickens' age and purpose.

Complete Chicken Feed vs. Scratch Grains: What's the Difference?

Understanding the difference between complete chicken feed and scratch grains is essential when calculating your flock's feeding needs.

Complete Chicken Feed

A complete chicken feed is formulated to supply the nutrients required for a particular age or production stage when used according to its directions.

Common categories include chick starter, grower, layer, and broiler feeds.

Chicken Scratch Grains

Scratch grains typically contain grains such as cracked corn, wheat, or barley.

Scratch grains are generally offered as an additional feeding item rather than as the primary source of nutrition.

For example, Chatham Farm Chicken Scratch Grain contains cracked whole corn, whole wheat, and whole barley, according to its product packaging.

Scratch grains should not replace an age-appropriate complete feed. As a general guideline, treats and scratch grains should form only a small portion of a chicken's daily diet.

When calculating feed purchases, plan your complete feed needs first and account for any additional grain purchases separately.

FAQ About Chicken Feed

How much feed do 10 chickens need per day?

Ten standard adult laying hens consume approximately 2.5 lb (1.13 kg) of complete feed daily, based on an average of 0.25 lb per bird.

How much chicken feed do I need for 20 chickens?

Twenty adult laying hens may consume approximately 5 lb daily, 35 lb weekly, or 150 lb in a 30-day month.

How long will a 50 lb bag last for 10 chickens?

A 50 lb bag will last approximately 20 days for 10 adult laying hens consuming an average of 0.25 lb per bird each day.

How much feed does one laying hen eat in a month?

At 0.25 lb daily, one adult laying hen consumes approximately 7.5 lb of feed over 30 days.

Can chickens eat only scratch grains?

No. Scratch grains are not typically formulated as complete diets. Chickens should receive a complete feed appropriate to their age and production stage.

Do free-range chickens need chicken feed?

Yes. Even when chickens forage outdoors, they should have access to an appropriate complete feed so they can meet their dietary requirements.

Should I limit how much feed my laying hens eat?

For most backyard laying hens, continuous access to suitable complete feed is recommended. Follow professional advice if your flock requires a specialized feeding program.

How can I estimate chicken feed costs?

Multiply the total feed your flock consumes by the cost per pound or kilogram.

Include expected waste and round up when purchasing full feed bags.

Plan Your Chicken Feed Purchases With Chatham Farm Feed & Supplies

A reliable chicken feed calculator makes it easier to estimate daily feed requirements, plan monthly purchases, and manage flock feeding expenses.

For standard adult laying hens, 0.25 lb per bird per day provides a convenient starting estimate. Remember that actual consumption varies by bird size, weather, age, and feeding conditions.

At Chatham Farm Feed & Supplies, we understand the importance of practical feeding routines and convenient farm supplies.