Expected Chicks
15
Hatch Rate
76%
Fertile Eggs
20
Days
21
Expected Chicks
15
76% estimated hatch rate
Fertile Eggs
20
Incubation
21 days
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Inputs
Result
Fertile = 24 × 0.85 = 20. Rate = 80 × 0.95 = 76%. Chicks = 20 × 0.76 = 15.
Inputs
Result
Fertile = 12 x 0.80 = 10. Rate = 75 x 0.85 = 63.75. Chicks = 10 x 0.64 = 6.
Chicken eggs need 99.5°F (37.5°C) in a forced-air incubator or 101°F (38.3°C) in a still-air incubator. Even 1°F deviation reduces hatch rates by about 10%. Maintain temperature within 0.5°F for best results.
Chicken eggs need 45–55% relative humidity for days 1–18 and 65–75% for lockdown (days 18–21). Low humidity causes chicks to stick to the membrane. High humidity causes drowning in the shell.
| Species | Temp (°F) | Humidity | Lockdown RH |
|---|---|---|---|
| Chicken | 99.5 | 50% | 65% |
| Duck | 99.5 | 55% | 75% |
| Quail | 99.5 | 50% | 65% |
| Turkey | 99.5 | 55% | 70% |
Turn eggs at least 3 times per day (always odd number so eggs alternate sides overnight). Auto-turners rotate every 1–2 hours. Stop turning 3 days before hatch date (lockdown).
Eggs stored more than 7 days before incubation lose about 1% hatch rate per day. Ideal storage is 3–7 days at 55–60°F with 75% humidity, pointed end down. Eggs over 14 days old have significantly reduced viability.
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Last Updated: Mar 20, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.