How Long Are Cats Pregnant? Cat Gestation Period, Signs, and Due Date

Cats are pregnant for about 63 to 65 days, or roughly nine weeks, counted from mating. The Merck Veterinary Manual gives 60 to 65 days as the usual span, and a large study of more than 1,000 pedigree litters in the UK found an average of 65.1 days (Sparkes and colleagues, 2006). If you know the mating date, the free Creatures cat gestation calculator adds 65 days and shows a planning window around it, no account needed.

A due date for a cat is always an estimate. Cats ovulate in response to mating, breeders often allow several matings over two or three days, and nobody sees the moment of conception, so a healthy queen can deliver a few days either side of the date you circled. This guide covers where the numbers come from, how to work out a due date when you are not sure of the mating, the signs of pregnancy week by week, how to prepare for the birth (called queening), and the danger signs that mean you should call a veterinarian now.

How long are cats pregnant? Why the sources differ

Every reputable source lands in the same nine-week neighborhood, but the exact numbers differ because they measure from different starting points.

• From mating: Merck’s owner guide says pregnancy lasts 60 to 65 days, and Merck’s table of approximate gestation periods lists 65 days for the cat. The welfare charity International Cat Care gives 63 to 65 days, and Cats Protection says 63 days, or around nine weeks.
• From the hormone surge: Merck’s professional section says birth in the queen happens 64 to 66 days after the LH surge triggered by mating. You cannot see that surge at home, so this figure matters more to reproductive vets than to owners.
• From real litters: the 2006 UK study of 1,056 litters from 14 pedigree breeds found a mean of 65.1 days, and found that gestation length varied significantly between breeds. Larger litters tended to arrive a little sooner.

Why the spread? A cat is an induced ovulator: mating itself triggers the release of eggs. Merck advises multiple breedings over 2 to 3 days for that reason, which means a single “breeding date” is really a short window. Count from the first mating you saw, expect the birth somewhere in the week around day 65, and start watching closely from about day 60.

How to work out your cat’s due date

If you know when she mated, add 65 days to the first mating date. The cat gestation calculator does this for you and shows a 63 to 67 day planning window. If she was with a tom for several days, switch the calculator to Exposure Window and enter the first and last day together. The window widens to reflect that conception could have happened on any of those days, which is more honest than picking one date and hoping. The calculator can copy, print, or add the dates to your calendar without an account. The help article on the gestation calculator walks through each option.

If you do not know when she mated, which is common with an indoor-outdoor cat or a new stray, a veterinarian can estimate how far along she is. Merck notes that ultrasound is most useful from 25 to 35 days, that scans before day 21 can miss a pregnancy, and that measurements of the kittens on ultrasound can be used to estimate gestational age. Late in pregnancy, an X-ray taken more than 55 days after breeding shows the kittens’ skeletons and helps count the litter, which is useful because it tells you how many kittens to expect before you decide labor is over.

If she is past day 65, do not panic, but do not wait indefinitely either. A healthy queen can go a few days past the average, and Cats Protection notes that you could be waiting into week ten. If she is well into week ten with no sign of labor, check in with your vet, and call straight away if she is overdue and also seems unwell.

Signs your cat is pregnant

In the first two weeks there is usually nothing to see. The embryos implant in the uterus at about day 14, according to Merck, and outward changes follow after that.

• Pinking up (around week three). The nipples become pinker and slightly larger. International Cat Care and Cats Protection both describe this as one of the first signs an owner notices.
• Steady weight gain. Merck notes that pregnant queens gain weight in a steady, linear way throughout pregnancy, and her belly will round out through the second month.
• Appetite changes. Most queens eat more as pregnancy goes on. Cats Protection mentions that some vomit or go off their food for a while around week four; if that lasts more than a day or two, or she stops eating late in pregnancy before labor has started, ask your vet.
• Behavior changes. Some queens become more affectionate, others more withdrawn. Near the end she will start looking for a quiet, hidden place to give birth.

None of these signs is proof. A vet can confirm pregnancy by feeling the abdomen or by ultrasound from about day 21 to 30. That visit is also the right time to talk about her diet, any medications or parasite treatments (which should only be given on veterinary advice during pregnancy), and a plan for the birth.

A dated cat health record can keep prenatal visits, observations and the veterinarian’s instructions together.

Could it be a false pregnancy?

A queen can ovulate after mating without conceiving. Merck’s professional section notes that ovulation without pregnancy produces a luteal phase of roughly 45 days, and Merck’s owner guide says a false pregnancy in a cat usually ends on its own in one to three weeks. If your cat was mated but is not getting bigger by the second month, ask your vet to check rather than guessing.

Cat pregnancy week by week

These timings are approximate and assume day 1 is the first mating. Individual cats vary, so use them as a planning guide rather than a test.

• Weeks 1 and 2 (days 1 to 14): No visible change. Fertilized eggs travel to the uterus and implant around day 14.
• Week 3 (days 15 to 21): Nipples may pink up. Keep her indoors from here if she is not already, and book a vet visit for the coming weeks.
• Weeks 4 and 5 (days 22 to 35): The best window for a vet to confirm the pregnancy by palpation or ultrasound. Some queens have a brief spell of reduced appetite or vomiting.
• Weeks 6 and 7 (days 36 to 49): Her belly is clearly rounded and her appetite rises. Cats Protection notes you may see the kittens moving. Nesting behavior can begin.
• Week 8 (days 50 to 56): Nipples are swollen and mammary glands begin to fill. Set up the nesting box now so she has time to accept it. An X-ray after about day 55 can count the kittens.
• Week 9 and into week 10 (about days 57 to 67): Most queens give birth in this stretch. International Cat Care notes that nesting usually happens in the final two weeks, and she may become restless, pace, or groom herself heavily.

Feeding a pregnant cat

A pregnant queen’s energy needs rise early. Merck’s section on feeding practices in small animals says pregnant queens need more calories almost immediately after conception, that food intake rises by an average of about 25% during the last third of pregnancy, and that a growth (kitten) diet should be fed. Pregnant and nursing queens can be fed free choice or several times a day. After the birth, a nursing queen may need two to three times her normal intake, depending on litter size.

Cats Protection recommends switching to a good-quality kitten food once pregnancy is confirmed, and International Cat Care notes the growth diet can continue until the kittens are weaned. Fresh water should always be available. Your vet can tell you whether her body condition is right and whether any supplement is needed; do not add calcium or vitamins on your own.

Preparing for queening

About two weeks before the due date, give her a nesting area and let her explore it. Cats Protection suggests somewhere quiet, where people and other pets are not coming and going, that is warm, draft-free, and semi-enclosed, lined with plenty of clean, dry blankets, away from harsh lights, and near her food, water, and litter tray. Its example is a cardboard box with the top cut off and a cat-flap-sized opening in one side; a large box with one side cut low for easy entry works the same way. She may reject your choice and pick a closet or the back of a wardrobe; if that spot is safe and quiet, it is usually easier to move the box there than to move her.

Before the due date, also:

• Save your vet’s number and an after-hours emergency clinic’s number in your phone, and know how you would get her there at night.
• Have a clean carrier ready in case she needs to travel during labor.
• Keep other pets and visitors away from her nesting area in the last week.
• Keep her indoors. A queen close to term that goes outside may give birth somewhere you cannot reach.
• Note the kitten count from any X-ray so you know when she is really finished.

What labor looks like in a cat

Labor happens in stages, and knowing what normal looks like is what lets you spot the abnormal.

Stage one. The cervix opens and contractions start inside, but you usually see no straining yet. Merck says stage one normally lasts 12 to 24 hours, and that queens may become reclusive and restless, nest on and off, refuse food, and sometimes vomit. In real litters it is often quicker: the UK pedigree study found stage one took less than two hours in 82.9% of cats.

Stage two. Visible straining and the delivery of kittens. Each kitten arrives in its membranes and the queen usually licks it free and chews the cord. Merck describes typical intervals of 30 to 60 minutes between kittens, with great variation. Placentas may be eaten, may pass unnoticed, or may pass normally within 24 hours, and Merck notes the mother does not need to eat them.

Resting in the middle. Merck treats a rest of more than 4 to 6 hours, when you know kittens are still inside, as a reason to call your vet now, and strong straining for 1 to 2 hours without a kitten as another. Short pauses are normal: cats sometimes stop part way through a litter, nurse the kittens already born, and restart. The UK study found the whole litter was born within six hours in 85.7% of cats. A queen straining without result is never a pause. If you are unsure which you are looking at, call your vet.

Stay nearby and quiet, watch, and write down the time each kitten arrives. Do not pull on a kitten, give medication, or try to deliver kittens yourself unless a veterinarian is guiding you on the phone.

When to call a veterinarian now

Merck’s guide to reproductive disorders of female cats lists signs of a difficult birth (dystocia). If you see any of these, call a veterinarian now:

• A kitten is stuck partway out and its head is not showing. Merck says it must be delivered within 10 to 20 minutes or the kitten will die.
• Strong contractions for more than 1 to 2 hours with no kitten born.
• A resting period during labor of more than 4 to 6 hours, when you know more kittens are still inside.
• Fresh blood, or dark green discharge, before any kitten is born.
• No kitten within 24 hours after her rectal temperature drops below 100 degrees F, if you have been taking it.
• Obvious pain or illness in the mother, such as crying, or licking or biting at her vulva.
• She has a history of difficult births. Tell your vet before the due date so there is a plan.

Difficult births are not rare. The UK study recorded caesarean sections in 8.0% of pregnancies, and breed alone did not explain who needed one. After the kittens arrive, call your vet if she has a fever, smelly or pus-like discharge, hot or painful mammary glands, or stops caring for her kittens. Merck lists these as signs of uterine infection (metritis) and mastitis.

After the kittens arrive

The 2006 UK study found an average of 4.6 kittens per litter, with significant differences between breeds (the Creatures cat species page covers the breeds themselves), and a mean birth weight of about 93.5 grams. International Cat Care notes kittens weigh around 100 grams at birth, double that in a week, and triple it by three weeks. A kitchen scale and a daily weight for each kitten is the simplest early warning a breeder has.

Some normal discharge follows the birth. Merck describes it as dark red to black, odorless, and heavy for the first few days. What is not normal is the list in the section above.

Two planning notes that catch owners out:

• She can come back into heat while nursing. In a survey of French pedigree breeders covering 195 births, 49% of queens came into heat during lactation, and breeders linked some of those cases to reduced milk and sick kittens (Furthner, 2023). Keep her away from intact toms after the birth.
• Kittens mature fast. The American Association of Feline Practitioners notes that a cat can be reproductively active as early as 4 to 5 months and supports spaying or neutering cats not intended for breeding by 5 months of age. Plan the kittens’ vet visits early; our kitten vaccination schedule covers the first round.

Tracking a cat pregnancy on Creatures

The calculator gives you a date. If you breed cats, or you simply want every date and weight for this litter in one place, Creatures keeps the whole cycle from mating to kitten profiles. Here is what that looks like in practice.

1. Estimate the date, free. The cat gestation calculator works for any visitor. Enter the mating date or exposure window and you get the expected date, the window, and a timeline you can copy, print, or send to your calendar. The same page lists Merck’s danger signs, so the warning list is with you when you need it. Other species are on the gestation calculators page.

2. Save it as a breeding record (free account). Signed in, the calculator’s Log in breeding records button opens a breeding record with the dates carried over. Pick the queen, turn on Track as breeding cycle, link the tom (a Creatures profile or just a typed name), and save. A single date works for a known mating; a start and end date covers a few days together, and the likely window widens to match. If your vet gives you a better date after a scan, use Adjust projection rather than changing the mating date. See recording a breeding.

3. Follow the pregnancy on her Breeding tab. The queen’s profile shows the active cycle, the expected date or window, milestones, and progress photos you add as she grows. The tracking pregnancy and progress guide covers adjusting dates and adding photos.

4. See everything due on the Breeding dashboard. If you have more than one queen, the dashboard sorts active cycles into Expecting, Due soon, and Overdue, and lists projected care reminders alongside. For a cat, the reminders Creatures projects from a breeding record are the expected birth date, a pregnancy confirmation check around days 21 to 25, a radiograph for counting kittens around day 55, and a pre-birth progress photo late in the pregnancy. The nesting box is not one of them, so add your own reminder for week eight. It is a planning view, not a health assessment. See the breeding dashboard and reminders and upcoming care.

5. Record the birth and the litter. When the kittens arrive, record the birth from her Breeding tab with the number born alive and stillborn. Creatures closes the cycle and creates a litter group, and from there you can create a profile for each kitten, with parentage carried over from the breeding. Daily weights and first vet visits then go on each kitten’s own records. See recording births and creating a litter.

Once kittens have their own identities, the cat pedigree papers guide helps you check parent numbers and any registration or transfer claim before sharing ancestry.

6. Keep reserved buyers in the loop, if you sell kittens. Progress updates stay private by default, and you can choose to share selected ones with buyers who have reserved a kitten without making them public. See sharing pregnancy updates with reserved buyers. When the kittens go home, the free cat pedigree chart maker turns parent and grandparent names into a printable three-generation pedigree, and the cat name generator helps with call names.

Frequently asked questions

How many weeks is a cat pregnant?
About nine weeks. The usual range of 63 to 65 days works out to nine weeks, give or take a few days.

Can a cat be pregnant for 70 days?
Occasionally a healthy queen delivers a few days past the average, and pedigree studies show real breed differences. Cats Protection notes that labor can run into week ten. If she is well into week ten without labor, check in with your vet, and call sooner if she seems unwell.

How early can you tell a cat is pregnant?
Pinking of the nipples around week three is usually the first sign an owner sees. A vet can confirm the pregnancy by palpation or ultrasound from about day 21 to 30.

How many kittens do cats usually have?
The large UK pedigree study averaged 4.6 kittens per litter, with significant differences between breeds. An X-ray after about day 55 gives the best count for your own cat.

Is a cat pregnant the same length of time as a dog?
Close, but not the same. Dogs are pregnant for about nine weeks too, but counting from mating is less reliable in dogs because of how their ovulation works. Our guide to how long dogs are pregnant explains the difference. Other small pets differ more: a rabbit is pregnant for only about 31 days and a guinea pig for about 68; see how long rabbits are pregnant and how long guinea pigs are pregnant.

Does breed change how long a cat is pregnant?
Yes, a little. The 2006 UK study found that gestation length and litter size both varied significantly by breed. If you breed a particular breed, such as the British Shorthair or the Snowshoe, your own records across several litters will tell you more about your lines than any average.

Do this next on Creatures

Expecting a litter, planning one, or already counting kittens: keep the dates, the queen’s records, and the kittens’ first weights in one place. More about cats, from breeds to costs, is on the Creatures cat page and in our guide to what a cat costs.