Hatching Egg Inventory Calculator
Find how many hatching eggs your breeding pen can sell per week and month after rejects and your own sets, how many orders that supports, and a safe listing quantity within the storage cutoff.
Free · no account · works on mobile · embeddable
Best for breeders selling fertile hatching eggs locally or by mail. Updated .
Your breeding pen
Hatching eggs you can sell
Sellable per week = hens × eggs per hen per week × (collection days ÷ 7) × (1 − reject %) × (1 − kept %). Eggs inside the cutoff = sellable per day × storage days. Safe listing = the smaller of weekly dozens and cutoff dozens, rounded down. Fertility and hatch rate are the buyer's risk to discuss, not a guarantee this tool makes.
About the hatching egg inventory calculator
Selling hatching eggs is an inventory problem with a short clock. Eggs must be collected clean, sorted hard, shared with your own incubator, and set within about a week, so the number you can honestly list is smaller than what the pen lays. This calculator starts from breeder hens and their laying rate, removes days you do not collect, rejects, and the share you set yourself, and returns sellable eggs and dozens per week and month, the orders that supports, the eggs ever on hand inside the storage cutoff, and a safe listing quantity.
It pairs with the hatching egg price calculator: this tool says how many, that one says at what price.
From eggs laid to eggs you can sell
Eggs collected per week are hens × eggs per hen per week × collection days ÷ 7; eggs laid on a day nobody gathers them sit in the nest, get dirty or chilled, and belong in the table egg basket. Rejects come off next: misshapen, cracked, dirty, thin-shelled, and undersized eggs should never be sold as hatching eggs. Then your own share is set aside for the incubator. What remains is sellable, shown per week and per month (4.33 weeks), and divided by dozens per order to give orders per week.
The storage cutoff and the safe listing
Mississippi State Extension recommends storing hatching eggs no longer than one week at 50 to 65 F and about 70% relative humidity, turning them daily; its incubation guide adds that hatchability holds reasonably well to seven days and declines rapidly afterward, reaching almost zero at three weeks. The calculator multiplies your daily sellable eggs by the storage limit to show the most eggs ever on hand inside that window. The safe listing quantity is the smaller of weekly dozens and cutoff dozens, rounded down, so a buyer never receives eggs older than your limit. Setting a limit under 7 days shrinks the safe listing; raising it above 7 does not raise the listing, it only lets more eggs sit on hand, and those hatch worse. The tool warns when the limit exceeds 7 days.
Worked example: a 12-hen breeding pen
Twelve breeder hens at 5 eggs a week lay 60 eggs, all collected on 7 collection days. A 10% reject rate removes 6.0 eggs; keeping 25% of the clean eggs for your own incubator sets aside 13.5; that leaves 40.5 sellable eggs, or 3.4 dozen a week and 14.6 dozen (176 eggs) a month. At one dozen per order that supports 3 orders a week. With a 7-day storage limit, about 40.5 sellable eggs (3.4 dozen) are ever on hand inside the cutoff, so the safe listing is 3 dozen, or 3 orders, per week.
Sources
- Mississippi State University Extension, Hatching egg storage period. Most eggs should be stored no longer than 1 week, at 50 to 65 F and 70% relative humidity with daily turning; the maximum for chickens is about 3 weeks with rising hatch failures. Accessed Sep 4, 2026.
- Mississippi State University Extension, Care and incubation of hatching eggs. Do not store eggs more than 7 days before incubating; hatchability holds reasonably well up to seven days and declines rapidly afterward; collect eggs at least three times daily. Accessed Sep 4, 2026.
This calculator gives planning estimates from the numbers you enter. It is not accounting, tax, veterinary, or legal advice. Replace the defaults with your own farm records whenever you have them.
Frequently asked questions
How long can hatching eggs be stored before incubating?
Extension guidance says no more than about 7 days at 50 to 65 F and around 70% humidity, turned daily. Hatchability declines quickly after a week and is near zero at three weeks. Shipped eggs have already used part of that window in transit.
How many hatching eggs can I sell from my flock?
Hens times eggs per hen per week, minus days you do not collect, rejects, and the eggs you set yourself. A dozen good breeder hens at 5 eggs a week with 10% rejects and a quarter kept back yields about 3 dozen sellable hatching eggs a week.
What eggs should I reject for hatching?
Cracked, dirty, misshapen, thin or rough shelled, very large or double-yolked, and undersized eggs. Sell those as table eggs where allowed. Many small breeders report a 5 to 15% reject rate from a well-run pen, a starting point to replace with your own sorting records; a higher rate points at nest box or nutrition problems.
Does this tell me fertility or hatch rate?
No. It counts eggs you can sell. Fertility depends on your rooster ratio and flock age, and hatch rate on the buyer's incubator and shipping. Track your own with the hatch rate calculator and share honest averages in your listing.
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