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Enter the number of laying hens, the average laying rate as a percent, the production period in days, and an allowance for cracks and breakage. The calculator returns eggs per day, total gross eggs, usable eggs after losses, and dozens. A healthy commercial flock at peak often lays at 85 to 90 percent, while backyard flocks vary with breed, age, daylight and feed. Results are planning estimates, not a guarantee, because real flocks respond to weather, health and housing.
The egg production formula is simple: eggs per day equals hens multiplied by the laying rate as a decimal. A laying rate of 85 percent means 85 of every 100 hens lay on an average day, so 100 hens at 85 percent give 85 eggs per day. Over 30 days that is 2550 gross eggs, and with a 5 percent breakage and loss allowance the usable total is 2422.5 eggs, or 201.88 dozens. Divide usable eggs by 30 instead of 12 if you sell in crates of 30 eggs: the same example gives 80.75 crates. A second example: 50 hens at 80 percent for 7 days give 40 eggs per day, 280 gross eggs, and with no losses 23.33 dozens. The formula assumes one constant average rate, so it is best used with a rate taken from your own recent flock records.
At an 80 to 85 percent laying rate, expect about 3 to 4 eggs per day from 4 hens, 40 to 45 from 50 hens, 80 to 85 from 100 hens, 160 to 170 from 200 hens, and 400 to 425 from 500 hens. The chart works for any flock size, so scale the same rates up or down. A flock of 1000 good layers at 85 to 90 percent gives roughly 850 to 900 eggs per day, or about 28 to 30 crates of 30. Use this egg production chart to work backwards too: if you want 6 eggs a day, you need about 9 hens at a two thirds laying rate, and a few extra as insurance, because no flock lays perfectly every day. Hen day egg production, which divides eggs by the hens actually present each day, is the fairest way to compare flocks, since it is not flattered by hens that left the flock.
Breed sets the ceiling. ISA Brown hybrids commonly lay 300 to 350 eggs per year, or about 6 to 7 per week at peak, and a White Leghorn lays about 280 to 320 per year of white eggs. Golden Comets and Hy-Line Browns sit in the same high band at roughly 300 to 330 per year, while Rhode Island Reds give a hardy 250 to 300, Australorps and Plymouth Rocks around 200 to 300, and ornamental breeds such as Silkies only 2 to 3 per week. Commercial hybrids peak in their first 12 to 18 months and then decline, while heritage breeds often lay for more years at a lower weekly rate. Pick the laying rate in the calculator from your breed band, not from the best week you ever recorded.
Hens start laying at about 16 to 24 weeks, peak in the first year, and decline with age. An egg takes 24 to 26 hours to form, which is why even top layers skip days. Daylight hours drive the cycle: shortening days in autumn cut production, and many keepers add light to hold about 14 to 16 hours of total light. Molt stops or slashes laying for weeks while hens regrow feathers, and cold, heat stress, poor feed, disease and overcrowding all cut the rate. If your calculated total is far above your real collection, check the laying rate first: it is almost always the input that drifted, not the arithmetic.
Turn usable eggs into a selling plan before you collect them. Dozens suit household and small market sales, while crates of 30 suit larger buyers and many farm shops. Storage matters: collect at least once a day, keep eggs cool and clean, and do not wash away the natural bloom unless your buyer requires it. Feed is the other half of the plan: a laying hen eats roughly 110 to 125 g of feed a day, so a 100 hen flock needs about 11 to 12.5 kg a day, and feed cost per dozen is the number that decides whether extra hens actually earn. Re-run the calculator with a conservative rate, an expected rate and a demanding rate to see the range before you commit to a buyer.
On average a healthy mature hen lays about 0.8 to 1 egg per day at peak, which is a laying rate of 80 to 100 percent. Because an egg takes 24 to 26 hours to form, even good layers skip days, so a weekly figure of 5 to 6 eggs is realistic for top breeds.
At an 80 to 85 percent laying rate, about 80 to 85 eggs per day. At 90 percent, about 90 eggs per day, or 3 crates of 30 eggs.
A good commercial flock averages 85 to 90 percent in its first year of lay. Backyard flocks often sit lower, around 60 to 80 percent, depending on breed, age and daylight.
Multiply hens by the laying rate as a decimal to get eggs per day, multiply by days for the total, then subtract a breakage allowance. This calculator does all three steps and converts the result to dozens.
A standard egg crate or tray holds 30 eggs in many markets. Divide usable eggs by 30 for crates, or by 12 for dozens.
Shorter daylight hours, molt, cold stress and age all reduce laying. Extra light to about 14 to 16 hours a day, good feed and shelter help, but some winter drop is normal.
Yes. Production is highest in the first year or two and declines each year after. Older hens still lay, but at a lower weekly rate and with larger eggs.
About 9 hens at a two thirds laying rate, and a few more if you want 6 eggs every single day without exception, since individual hens skip days.