Hatch Rate Calculator
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 9/9/2026
The hatch rate is calculated with (eggs hatched ÷ eggs set) × 100. For 18 eggs hatched out of 24 set, the hatch rate is 75%.
Explanation
Hatch rate is the reference indicator for assessing how successful an incubation was, whether in poultry farming (chickens, quail, ducks) or in a broader context of oviparous reproduction biology. It simply relates the number of eggs that actually hatched to the total number of eggs set for incubation, expressed as a percentage. A high hatch rate (often 80% or more in well-managed poultry farming) generally reflects good incubation conditions: stable temperature and humidity suited to the species, regular turning of the eggs, and satisfactory fertility of the starting eggs. A lower rate can have multiple causes to investigate separately: eggs that were never fertilized to begin with (distinct from an actual incubation failure — some breeders in fact calculate a hatch rate based only on fertile eggs rather than all eggs set), unsuitable temperature or humidity conditions, or health issues. This calculator gives the crude hatch rate, based on all eggs set for incubation; if you know the number of fertile eggs (determined by candling during incubation), you can recalculate a fertile-egg hatch rate by substituting that number for the total number of eggs incubated, to isolate the success of the incubation itself from the starting batch's initial fertility. Once chicks hatch, tracking how efficiently they convert feed into growth is a separate question, covered by our feed conversion ratio calculator, while the flock's overall breeding output over time is better read through its birth rate.
Example: 18 eggs hatched out of 24 set
Inputs
Eggs set for incubation: 24. Eggs hatched: 18.
Calculation
Hatch rate = (18 ÷ 24) × 100 = 75%.
Result
This incubation's hatch rate is 75%.
Frequently asked questions
What is a good hatch rate in poultry farming?
This varies by species, breeding line, and farming conditions, but a rate of 75 to 85% or more is often considered satisfactory for well-managed domestic poultry. A noticeably lower rate is worth checking separately: the starting egg batch's initial fertility, and whether incubation conditions (temperature, humidity, turning) ran smoothly.
Should the hatch rate be calculated on all eggs or only fertile eggs?
The two calculations mean different things: the crude hatch rate (based on all eggs set) evaluates the overall success of the starting batch through incubation, while a rate calculated only on fertile eggs (determined by candling, a technique that shows whether an embryo is developing) specifically isolates the performance of the incubation itself, independent of the eggs' initial fertility.
What factors most influence the hatch rate?
The stability of temperature and humidity throughout the entire incubation period ranks among the most decisive factors, along with regular turning of the eggs (which prevents the embryo from sticking to the shell) and the freshness of the eggs when set for incubation. The starting batch's fertility, tied to the quality of the breeding pair, also plays a role upstream of the incubation itself.