Cockatiel Egg Incubation Calculator

This cockatiel egg incubation calculator works out your expected hatch date, maps a day-by-day candling schedule, and tracks a whole clutch. Cockatiel eggs hatch after about 18 to 21 days (averaging 19–20) of steady incubation.

Count from the day the hen starts sitting full-time (often after the second or third egg), not the first egg laid. Add about 20 days for the expected hatch, and candle around day 7 and day 14 to check fertility.

Enter the day continuous incubation began to get the hatch date.

Incubation start date

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expected hatch date

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Earliest

Day 18

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Latest

Day 21

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Countdown

To hatch

See the dated candling and lockdown schedule for your clutch.

Incubation start date

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candling & hatch timeline

Map the lay and hatch dates for every egg in the clutch.

First egg laid on

Number of eggs

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lay & hatch dates

Enter the current day of incubation to see the stage and what to check.

Day of incubation

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incubation stage

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Day

Of incubation

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To hatch

~20 days total

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Candling

Status

Temperature, humidity and incubation times by species.

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incubation conditions

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Temperature

Incubator

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Humidity

Then raise

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Turning

To day 17–18

How the Cockatiel Egg Incubation Calculator Works

The cockatiel egg incubation calculator estimates the hatch date by adding the incubation period to the day sitting began. Cockatiel eggs take about 18 to 21 days (averaging 19–20) of steady incubation, so the expected hatch is roughly set date + 20 days. The key detail is where you start counting: not from the first egg, but from when the parents begin continuous incubation, which is often after the second or third egg is laid. The calculator also maps the candling windows (around day 5–7 and day 10–14) and the hatch window, and can track a whole clutch egg by egg.

Milestone	Day of incubation	What happens
Start of count	Day 0	Parents begin sitting full-time
First candling	Day 5–7	Blood vessels & dark spot = fertile
Second candling	Day 10–14	Confirm steady development
Pre-hatch / lockdown	Day 17–18	Stop turning; chick fills the egg
Hatch	Day 18–21	Pipping and hatching (avg ~20)

If a fertile-looking egg is still not hatching a few days past day 21, give it until about day 23–24, then candle — eggs that were never fertile will not hatch, and a vet or breeder can advise on a chick that died in shell.

Cockatiel Incubation Timeline

This timeline shows the roughly 20-day cockatiel incubation from the day sitting begins, with the candling windows, lockdown and hatch marked.

How Long Do Cockatiel Eggs Incubate?

Cockatiel eggs incubate for about 18 to 21 days, with most hatching around 19 to 20 days of steady sitting. Count from the day the parents begin continuous incubation rather than the day the first egg appears, because a hen often lays two or three eggs before she sits tightly — so eggs laid days apart can still hatch close together. A few eggs run a little late, so it is normal to wait until about day 23 or 24 before giving up on a fertile egg. Chilling, an unsteady sitter or poor incubator settings can all stretch the timeline.

How to Check if Cockatiel Eggs Are Fertile

The reliable test is candling: in a dark room, hold a small bright torch against the egg from around day 5 to 7. A fertile egg shows a spider-web of red blood vessels and a small dark spot (the embryo) that grows over the following days, while an infertile (clear) egg stays translucent and yellowish with no veins. By day 10–14 a developing egg looks mostly dark as the chick fills the shell. A blood ring or a clear egg that never develops means it will not hatch. Candle briefly and infrequently so you do not chill the eggs, and stop candling once the hatch window begins. You cannot tell fertility from the outside of a fresh egg — only candling (or incubation itself) shows it.

How Many Eggs Does a Cockatiel Lay?

A cockatiel usually lays 4 to 6 eggs in a clutch, though clutches of anywhere from 2 to 8 occur. She lays one egg every other day until the clutch is complete, and a pair may raise more than one clutch in a season. Pet hens can also lay infertile eggs without a mate, especially with long daylight hours and lots of food; this is normal but chronic egg-laying drains calcium and is a health risk, so if a lone hen lays repeatedly, shorten her daylight, remove nest-like spaces, and see an avian vet. Let a hen sit her infertile clutch for a couple of weeks rather than removing eggs immediately, which often just prompts more laying.

What Month Do Cockatiels Lay Eggs?

In the wild (Australia) cockatiels breed mainly after the rains, broadly spring into summer, triggered by food and long days. In captivity there is no fixed month: pet cockatiels can lay at almost any time of year because stable warmth, abundant food and long hours of household light keep them in breeding condition. Spring (and the longer days of late winter onward) is still the most common trigger. If you are not deliberately breeding and your hen keeps laying, that is usually a sign to reduce her daylight to 10–12 hours, cut rich foods, and remove cosy nest sites — and to see an avian vet if laying continues.

Frequently Asked Questions

How long is incubation for cockatiel eggs?

About 18 to 21 days of steady incubation, averaging roughly 19 to 20 days. Count from the day the parents begin sitting full-time, not the day the first egg was laid. A fertile egg may hatch a couple of days late, so it is normal to wait until about day 23 to 24 before giving up.

When should I candle cockatiel eggs?

Candle for the first time around day 5 to 7, when a fertile egg shows a web of blood vessels and a dark spot, and again around day 10 to 14 to confirm the embryo is growing. Use a small bright light in a dark room, candle quickly so the egg does not chill, and stop once the hatch window begins.

Why haven’t my cockatiel eggs hatched after 21 days?

Some eggs simply run a few days late, so wait until about day 23 or 24 if candling showed a live embryo. If the eggs were never fertile, were chilled, or the hen sat inconsistently, they will not hatch. Candle to check for development, and ask an avian vet or breeder if a fertile egg stalls at the end.

Do you count incubation from the first egg or when the hen sits?

From when the hen begins continuous incubation, which is often after the second or third egg. Many cockatiel hens do not sit tightly on the very first egg, so counting from the first egg laid gives a hatch date that is too early. Watch for steady, full-time sitting and start the count from there.

Can you incubate cockatiel eggs without an incubator?

The easiest and safest way is to leave fertile eggs with a steadily sitting hen, who maintains the right warmth, humidity and turning naturally. Artificial incubation without a proper incubator is very hard to do well, since cockatiel eggs need about 37.5°C and controlled humidity. If parents fail, contact an experienced breeder or avian vet rather than improvising.

How many eggs can a cockatiel lay in a year?

A pair may raise two or occasionally three clutches of 4 to 6 eggs in a breeding season, but repeated clutches are tiring and a hen that lays almost continuously is at risk. Chronic laying depletes calcium and can cause egg-binding, so limit breeding, shorten daylight, and consult an avian vet if a hen keeps laying.

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PetCalculatorHub Editorial Team

This cockatiel egg incubation calculator uses the well-documented 18–21 day (average ~20) cockatiel incubation period and standard aviculture candling windows, counted from the start of continuous sitting. Dates and stages are general guidance, not veterinary advice, and real clutches vary with the hen, temperature and fertility. For incubation problems, a stalled hatch, or a hen that lays repeatedly, consult an experienced breeder or an avian vet.

References: the World Parrot Trust and the PDSA pet-bird guides.

Last updated: October 2026