Cat pregnancy calculator
How long are cats pregnant?
Cats are pregnant for around 63 to 65 days, which is roughly nine weeks or just over two months. Most queens deliver somewhere between day 63 and day 67, though anywhere from about 60 to 70 days can be normal.
A pregnant cat is called a queen, and the process of giving birth is known as queening. The exact length varies a little from cat to cat, and some pedigree breeds such as Siamese and other oriental types tend to carry their kittens a few days longer than average.
Because cats only release eggs after mating, the date she mated is a good starting point for working out when her kittens are due. It is still an estimate though, so it helps to treat the due date as the middle of a likely window rather than a fixed day.
How does the cat pregnancy calculator work?
The calculator adds 65 days to the mating date you enter, then shows a likely birth window of roughly 63 to 67 days either side. It gives you an estimated due date plus the week your queen has reached today.
If your cat mated over several days, which is common, use the first mating date for the earliest possible due date and the last mating date for the latest. The real day of birth depends on when she actually ovulated, so the window matters more than any single date.
For a precise timeline, your vet can confirm the pregnancy and estimate her stage far more accurately than counting from a mating date. The calculator is a planning tool, not a substitute for a check-up.
How can I tell if my cat is pregnant?
The earliest reliable signs usually appear from around three weeks. Her nipples become larger and pinker, a change breeders call pinking up, her heat cycles stop, and her appetite and behaviour may shift. A growing tummy follows later.
In the first couple of weeks you often cannot tell at all, even a vet may not be able to. As the weeks pass you may notice she sleeps more, seeks more affection, or goes off her food briefly in a way a little like morning sickness.
The only way to know for certain is a visit to your vet. They can gently feel her tummy from around 17 to 21 days, and an ultrasound scan can pick up the pregnancy from roughly day 16, with kitten heartbeats visible from about three weeks.
Cat pregnancy week by week
Here is a rough guide to what happens across the nine weeks, and what you can do to help. Every cat is different, so treat the weeks as a general map rather than a fixed schedule.
| Stage | What is happening |
|---|---|
| Weeks 1 to 2 (days 1–14) | Mating, ovulation and fertilisation, then the embryos travel to the womb and implant. Few outward signs. She may still behave completely normally. |
| Week 3 (days 15–21) | Hormones surge and the nipples often start pinking up. Heat cycles stop. A vet may be able to feel the pregnancy by gently palpating her tummy towards the end of this week. |
| Week 4 (days 22–28) | Some queens go off their food or seem a little queasy. An ultrasound can confirm the pregnancy. Avoid picking her up roughly from now on to protect the kittens. |
| Week 5 (days 29–35) | Her tummy begins to round out noticeably. The kittens are developing quickly and she will need a good quality kitten or pregnancy food to support them. |
| Week 6 (days 36–42) | Appetite climbs as she builds reserves for nursing. From around now an X-ray can show the kittens’ skeletons, which is the most reliable way for a vet to count how many to expect. |
| Week 7 (days 43–49) | She looks clearly pregnant and rounded. You may see and feel the kittens moving. Keep her calm, comfortable and well fed. |
| Week 8 (days 50–56) | Her nipples are prominent and she may start grooming her tummy and looking for a quiet nesting spot. Set up a warm, private nesting box away from noise and other pets. |
| Week 9 (days 57–65) | Birth is close. She may become restless, nest more, eat less and seek out her chosen spot. Milk may appear at the nipples. Be ready for labour at any point. |
How many kittens will my cat have?
The average litter is around four kittens, though it can range anywhere from one to twelve. First-time mums usually have smaller litters of about two to three, and litters tend to get bigger with later pregnancies.
Breed plays a part too. Siamese, Burmese and other oriental breeds often have larger litters, while some breeds tend towards smaller ones. The only way to know how many kittens to expect is an X-ray at your vet from around week six, once the kittens’ bones have formed.
Knowing the number in advance is genuinely useful. It tells you how much nesting space and kitten food to prepare, and it warns you during the birth if a kitten still seems to be waiting once labour appears to have finished.
What are the signs that my cat is going into labour?
In the day or two before birth, many queens go off their food, become restless and start nesting in their chosen spot. A drop in body temperature and milk appearing at the nipples are common signs that labour is close.
As labour begins she may pant, pace, cry, groom her rear end and settle into the nest. Once strong contractions start, the first kitten usually arrives within an hour or so, and the rest follow at intervals of roughly five minutes to an hour. The whole process often takes a few hours but can stretch across much of a day.
It is normal for her to rest between kittens, sometimes for an hour or two, while still seeming calm and comfortable. A quiet, warm, private space helps her feel safe enough to get on with it. Watch from a distance and try not to interrupt.
When should I call the vet?
Contact your vet straight away if she has been straining hard for 20 to 30 minutes without producing a kitten, if more than four hours of contractions pass before the first kitten, or if she seems to be in pain, distressed or exhausted.
Other reasons to call include a kitten that appears stuck, heavy bleeding, a green or foul-smelling discharge before any kitten is born, or her passing her due window with no sign of labour at all. If you are ever unsure, it is always better to ring and ask.
It helps to have your vet’s number and your nearest out-of-hours emergency service to hand before the due date, because kittens have a habit of arriving in the middle of the night. Most births go smoothly with no help needed, but knowing the warning signs means you can act quickly if something is wrong.
How do I care for my pregnant cat?
From around the midpoint of pregnancy, move her onto a complete kitten or pregnancy food so she gets the extra energy, protein and nutrients she and her kittens need. Let her eat to appetite, and always keep fresh water available.
Keep her routine calm and let her rest. Avoid lifting her awkwardly from week four onwards, and set up a warm, quiet nesting box in a private corner a week or two before she is due so she can settle in. Speak to your vet about worming during pregnancy, as some products are not safe to use.
Regular vet checks through the pregnancy are worth booking. They confirm the kittens are developing well, help you plan for the birth, and give you a chance to ask anything you are unsure about. Working out her age in cat years compared with human years can also help you understand her life stage and needs.
Should I let my cat have kittens, or have her neutered?
Many cat pregnancies in the UK are unplanned. Cats can become pregnant from as young as four months old, and an unneutered female who goes outside is very likely to mate. Neutering is the usual way to prevent unwanted litters and brings real health benefits.
As well as avoiding accidental litters, neutering lowers the risk of certain cancers and of pyometra, a serious womb infection. Most vets and welfare charities recommend neutering from around four months of age. It is a personal decision, and your vet can talk you through the right timing for your cat.
If you are weighing up the costs, our guide on whether pet insurance covers neutering explains how it is usually treated, and you can also see what it costs to microchip a cat, which is a legal requirement for owned cats in England.
What about insurance and vet costs?
Pregnancy, birth and routine neutering are not usually covered by pet insurance, as they are considered planned or preventable rather than unexpected illness or injury. It is worth understanding this before you take out a policy.
Where cover can help is the unexpected. Birth complications, a poorly kitten, or illness in the mother can lead to sudden vet bills, and a lifetime policy taken out while a cat is healthy can help with eligible conditions later on. Always read the policy wording so you know what is and is not included. You can learn more on our cat insurance page.
Frequently asked questions
How accurate is a cat pregnancy calculator?
It gives a sensible estimate based on the average 63 to 65 day gestation, but it cannot be exact because the true date of conception is hard to pin down. Treat the due date as the centre of a likely window, and let your vet confirm the timeline.
Can I feel the kittens moving?
Often yes, usually from around week seven, you may see or feel the kittens shifting when she is relaxed. Avoid pressing on her tummy to check, as this can harm the kittens. Let your vet do any hands-on examination.
How soon can a cat get pregnant again after giving birth?
Surprisingly quickly. A queen can come back into heat within a few weeks of giving birth, even while still nursing, so she can become pregnant again very soon. This is one reason vets recommend neutering once she has recovered.
Do Siamese cats stay pregnant longer?
Often slightly, yes. Siamese and other oriental breeds tend to carry their kittens a few days beyond the typical 65 days, sometimes into the tenth week. If she passes the expected window with no labour, check in with your vet.
