Calculate chicken hatch dates, find when to stop turning, or work backward from a desired hatch date and lockdown date for chickens and other birds.
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Chicken Hatch Date Formula
The calculator uses simple date arithmetic based on the incubation period of the bird species you select.
Hatch date mode:
Hatch Date = Set Date + Incubation Days
Set date mode:
Set Date = Hatch Date - Incubation Days
Same hatch day mode (two species):
Set Date A = Hatch Date - Days A Set Date B = Hatch Date - Days B Stagger Gap = |Days A - Days B|
Variables:
- Set Date - the day eggs go into the incubator (day 0).
- Hatch Date - the day chicks are expected to pip and emerge.
- Incubation Days - species-specific length of incubation (21 for chickens).
- Lockdown Day - usually 3 days before hatch, when turning stops and humidity is raised.
- Stagger Gap - how many days earlier the longer-incubation eggs must be set.
The Hatch date mode answers "I set eggs today, when do they hatch?" The Set date mode works backward from a target hatch day so you know when to start. The Same hatch day mode aligns two species so chicks of different types come out together. Each result also gives lockdown and candling milestones based on the incubation length.
Incubation Periods and Key Milestones
Use this table to confirm the species defaults the calculator applies.
| Bird | Incubation (days) | Lockdown | Candling |
|---|---|---|---|
| Chicken | 21 | Day 18 | Day 7, 14 |
| Quail | 17 | Day 14 | Day 7, 12 |
| Pheasant | 24 | Day 21 | Day 7, 14 |
| Duck | 28 | Day 25 | Day 7, 14 |
| Turkey | 28 | Day 25 | Day 7, 14 |
| Guinea fowl | 28 | Day 25 | Day 7, 14 |
| Peafowl | 28 | Day 25 | Day 7, 14 |
| Goose | 30 | Day 27 | Day 7, 21 |
| Muscovy duck | 35 | Day 32 | Day 10, 25 |
| Emu | 50 | Day 47 | Day 14, 35 |
Target temperature and humidity are not date-driven, but they matter for hitting the predicted hatch day. Drift in either can shift hatch by 12 to 48 hours.
| Stage | Temp (forced air) | Humidity |
|---|---|---|
| Days 1 to lockdown | 99.5°F | 45 to 55% |
| Lockdown to hatch | 98.5 to 99°F | 65 to 75% |
Examples and FAQ
Example 1. You set 12 chicken eggs on March 1. Add 21 days. Hatch date is March 22. Stop turning and raise humidity on March 19 (day 18).
Example 2. You want ducklings and chicks to hatch the same day, May 30. Ducks need 28 days, chickens need 21. Set duck eggs on May 2 and chicken eggs on May 9. The 7-day stagger lines up the hatch.
Do eggs always hatch exactly on the calculated day? No. Most hatches occur within a 24 to 48 hour window around the predicted date. Cooler incubator temperatures push hatch later, warmer temperatures pull it earlier.
What if I set eggs in the evening? Count the next morning as day 1. Setting late in the day shifts the hatch slightly into the evening of day 21 for chickens.
Can I open the incubator after lockdown? Avoid it. Once chicks start internal pipping, a humidity drop can shrink-wrap them in the membrane.
Why did my eggs hatch a day early or late? Average incubation temperature is the main driver. A steady reading of 100°F instead of 99.5°F can advance hatch by roughly 24 hours. Storage age before setting also matters.