Chicken Flock Planner
Want 24 eggs a week from Rhode Island Reds? You need 5 hens. This chicken flock planner works out hens, coop size, run size, feed, water and nest boxes from the eggs you want and breed. It uses breed laying rates — 250 eggs a year for a Rhode Island Red — and counts winter laying 30% lower.
Chicken Flock Planner
Planning estimate. Figures vary by breed, strain, climate and management — see the sources cited on this page.
Key facts
- Laying rates used (eggs per year, planning values): White Leghorn 280, Rhode Island Red 250, Australorp 250, Sussex 250, Easter Egger 250, Plymouth Rock 200, Orpington 200, Wyandotte 200, Marans 200, Silkie 100. Rates vary by strain — see the breed table on the chicken breed size chart.
- Winter laying runs about 30% lower for most breeds, because of short daylight. The winter setting in the calculator applies that reduction.
- Space and feed per bird: coop 4 sq ft, run 10 sq ft, feed 0.25 lb a day, water 0.5 L a day, 1 nest box per 4 hens, 8 in of roost per bird (standard breeds).
- Always round hens up — 4.2 hens means 5 hens, and the extra bird covers a broody hen or a slow layer.
How many chickens do I need?
Divide the eggs you want per week by the eggs each hen lays per week, and round up. Want 24 eggs a week from Rhode Island Reds at 4.8 eggs a week each? That is 5 hens. From Plymouth Rocks at 3.8 a week each, it is 7 hens. The breed matters as much as the number: a Leghorn flock needs fewer birds than a Silkie flock for the same basket of eggs.
How many hens do I need for eggs per week?
Work backwards from the basket. A family wanting a dozen eggs a week needs 3 Rhode Island Reds; two dozen needs 5; four dozen needs 10. In winter, laying drops about 30%, so the same 5 hens give about 17 eggs a week instead of 24 — plan the flock for winter if you want eggs all year, or accept a lighter basket from December to February.
What the flock needs beyond hens
Five hens need a 20 sq ft coop, a 50 sq ft run, about 1.25 lb of feed and 2.5 L of water a day, and 2 nest boxes. The planner gives all of these in one pass, in square feet and square metres, pounds and kilograms. Use the individual calculators — coop size, feed, water and nest boxes — to adjust any figure for bantams, large breeds or free-ranging.
What this planner does not do
It does not account for broody hens, moulting, old hens laying less, or losses, and it does not set a feed price — enter your own if you want the feed cost. It also assumes the hens are in lay; pullets take 18 to 24 weeks to reach point of lay depending on breed, so a new flock will not hit the target in its first months. Use the first egg calculator to work out when laying starts.
Frequently asked questions
How many chickens do I need calculator — how does it work?
Enter the eggs you want per week and pick a breed. The planner divides the eggs wanted by the breed laying rate — 4.8 eggs a week for a Rhode Island Red — and rounds up to whole hens. It then works out coop size, run size, feed, water, nest boxes and roost length for that flock.
How many hens do I need for eggs per week?
Divide the eggs you want by the eggs per hen per week for your breed. For 24 eggs a week from Rhode Island Reds at 4.8 eggs each, you need 5 hens. From Plymouth Rocks at 3.8 eggs each, you need 7 hens. In winter, laying drops about 30%, so allow extra hens for year-round eggs.
What is a flock size calculator for chickens?
It works out how many hens you need for a target number of eggs per week, then sizes the coop, run, feed and nest boxes for that flock. This planner does all of it in one pass, from the eggs wanted per week and the breed you choose.
How many chickens should I get?
Start from the eggs you want: a dozen a week needs 3 Rhode Island Reds, two dozen needs 5, four dozen needs 10. Then check your coop and run can hold them, and your local rules allow that many. A mixed-age flock keeps eggs coming while older hens moult.
How many eggs will 5 hens lay per week?
About 24 eggs a week for Rhode Island Reds at 4.8 eggs each, or about 27 for White Leghorns at 5.4 each. In winter, expect about 30% less. Pullets under 18 to 24 weeks old are not laying yet, so a new flock takes time to reach full production.
The Best Chicken Breeds for Beginners guide covers this topic in more detail. The How to Introduce New Chickens to a Flock guide covers this topic in more detail. Two related calculators worth checking next are the Chicken Water Calculator and Chicken Worming Dosage Calculator.