Incubation Calculator
Calculate hatch date, turning schedule, temperature, and humidity requirements for chicken, duck, turkey, goose, and quail eggs.
About this calculator
Successful incubation depends on holding two variables steady for a fixed number of days -- temperature and humidity -- then stepping both down or up at a defined point called lockdown. This calculator works from two inputs: which species you're setting (chicken, duck, turkey, goose, or quail) and the day of year you loaded the incubator. From those it returns the full schedule the species requires -- incubation length, setting temperature and setting humidity, the lockdown date, and the temperature/humidity you should shift to at lockdown -- plus a turning schedule and two candling checkpoints for checking fertility partway through incubation. Species drives essentially every biological requirement here: a quail set for 17 days needs a very different candling and lockdown timeline than a goose set for 30.
Turkeys and ducks share the same 28-day incubation length and this calculator's temperature/humidity schedule for both; real-world backyard practice sometimes runs duck humidity a few points higher than turkey (duck eggshells are often described as less porous), but this calculator does not model that distinction, so treat duck and turkey results here as identical starting points and adjust based on your own incubator's hatch results. The set date, by contrast, only shifts the calendar -- it changes when lockdown and hatch land on the calendar, not how long incubation takes or what temperature and humidity the species needs; those stay fixed once you've picked a species. What this calculator doesn't account for: individual incubator calibration (forced-air and still-air units run differently at the same thermostat setting), local altitude effects on evaporation and humidity, fertility rate or actual hatch percentage, and breed-to-breed variation within a species -- bantam and standard chicken strains can differ by a day. Treat the schedule as a documented starting point and verify actual conditions with a calibrated thermometer/hygrometer placed inside the incubator, not its display reading.
Inputs
Results
Incubation Period
21 days
Expected Hatch Date
Mar 22
How to Use This Calculator
- Select the species: Chicken, Duck, Turkey, Goose, or Quail.
- Enter the set date as the day of year (1–365) when eggs were loaded into the incubator.
- Review Setting Temperature, Setting Humidity, and Lockdown Temperature/Humidity for your incubator settings.
- Note the Expected Hatch Date and Lockdown Date — move eggs to the hatcher and stop turning at lockdown.
- Follow the turning schedule during the setting phase — eggs should be turned at least 3 times per day.
What each input means
- Species
- Species being incubated.
- Set Date (Day of Year)
- Day of year eggs are set in the incubator (1 = Jan 1, 60 = Mar 1, 121 = May 1).
How this is calculated
Worked example, using the default values
- Identify Input ParametersSpecies = 1, Set Date (Day of Year) = 60 = 2 input(s) provided
- Calculate Incubation PeriodIncubation Period = sp.days21 = 21
- Calculate Expected Hatch DateExpected Hatch Date = dayOfYearToDate(hatchDayOfYear)Mar 22 = Mar 22
- Calculate SpeciesSpecies = sp.nameChicken = Chicken
- Calculate Lockdown DateLockdown Date = dayOfYearToDate(lockdownDayOfYear)Mar 19 = Mar 19
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why doesn't changing the set date change the incubation period?
Incubation length, setting temperature, setting humidity, and the turning schedule are all fixed properties of the species you're incubating, not the calendar date you load the incubator. Moving the set date earlier or later shifts every downstream date -- lockdown day and hatch day -- by exactly the same number of days, but it has zero effect on how many days incubation takes or what temperature and humidity that species needs throughout.
What happens at lockdown, and why does humidity go up while temperature goes down?
Lockdown is when you stop turning the eggs and move them from the incubator to the hatcher position (or seal the incubator if it's a combo unit). Humidity is raised at this stage to soften the inner shell membrane so hatching chicks don't dry out or get stuck partway through pipping, while temperature is nudged slightly lower (half a degree in this calculator's model) because a tray of actively hatching, metabolically active chicks generates more heat on its own than a tray of quietly developing eggs.
How are the two candling checkpoints determined?
The first candling check falls on day 7 for most species, or day 5 for quail, since their shorter 17-day incubation compresses the whole developmental timeline. The second candling check falls at roughly the halfway point of the species' total incubation period, which is when a fertile, developing egg shows a clearly visible network of blood vessels and an infertile or non-developing egg still looks clear.
Does the turning schedule differ between species?
Turning frequency is 5 times per day for chickens, ducks, turkeys, and quail, but drops to 3 times per day for geese in this calculator's schedule, and turning stops entirely once the species reaches its lockdown day. The total number of turns reported is that daily rate multiplied by the number of days from set up to, but not including, lockdown day (turning stops when lockdown begins), so a longer incubation with the same turning rate produces more total turns.
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