Cat pregnancy · due date
When is my cat due?
Enter the day your cat was mated and this calculator gives her estimated due date — plus the honest earliest-to-latest window, because the mating day isn’t the exact day she conceived. A queen carries her kittens about 63–65 days, and the week-by-week timeline below shows what’s happening and what to do, from the first vet scan to setting up the kittening box.
Most likely between Thu, 17 Dec 2026 and Mon, 28 Dec 2026 — anywhere in that range is normal.
Cats are pregnant for about 63–65 days (roughly nine weeks) — usually 61–72 days counting from the mating date. The dates above are counted from the mating day you pick; the example shown starts from today.
How the due date is worked out
You count a pregnancy from the day of mating, because that’s the day you actually know — but it isn’t quite the day she conceived. A female is fertile for several days, and sperm can survive a few days waiting for the eggs, so the real conception can fall anywhere in that window. That’s why a due date is really a due range: this tool adds the average gestation to your mating date for the headline date, then shows the earliest and latest days that are still perfectly normal.
The gestation lengths here are the ones vets and breed sources publish (see below), and the week-by-week timeline is the standard one — when a scan can confirm the pregnancy, when an x-ray can count the litter, and when to have the nesting box ready. None of it replaces a hands-on exam, so the page defers to your vet throughout: they can scan her, count the babies and step in if the birth goes wrong.
Week by week: what’s happening and what to do
Counted from the mating date above — the dates shift automatically when you change it. Every date is an estimate, not a fixed appointment.
Mating & fertilisation
Cats are induced ovulators, so mating itself triggers the eggs to release. Feed and handle her exactly as normal — there’s nothing to see yet.
‘Pinking up’
Around day 15–18 her nipples enlarge and turn pink — often the first outward sign. Some queens have a brief off-food spell like morning sickness.
Ultrasound confirms it
From about day 21–25 an ultrasound confirms the pregnancy and shows the heartbeats — the earliest reliable way to be sure.
Her belly starts to show
The abdomen rounds noticeably. Move her onto a kitten/growth food — she needs the extra energy for the litter and for nursing.
X-ray counts the kittens
From about day 40–45 the kittens’ bones show on an x-ray, so the vet can count how many to expect — the reliable way to know the number in advance.
Set up the kittening box
Give her a quiet, warm, covered nesting box now. She’ll start seeking privacy and nesting; milk may begin to come in.
Due window opens
Any time from about day 61 is normal. She may go off her food, become restless and settle into her box in the day before labour.
Average due date
Most queens give birth around day 63–65. Watch for nesting, restlessness and her temperature dropping; then the first kitten usually follows.
Call the vet
Past about day 72 with no labour, call your vet — she’s overdue and should be checked over.
When to call your vet straight away
This tool estimates a date — it is not medical advice, and your vet is the authority. Call them without waiting if you see any of these during the birth:
- Strong contractions for 30–60 minutes with no kitten appearing.
- More than 1–2 hours of hard straining between kittens when more are due.
- Dark-green, black or bloody discharge before the first kitten is born.
- More than 24 hours of restlessness and nesting with no labour, or past day 72.
- Obvious distress or collapse, or a kitten visibly stuck in the birth canal.
The window is real — she can safely arrive a few days either side of the average. If your vet tested her progesterone around mating they can give a much tighter date; without it, treat the range as the honest answer.
Get the kittening kit ready by week 6
Queens like to nest somewhere quiet and warm, so have the setup ready before she’s due: a covered kittening box she can hide in, a gentle heat source for the kittens, a gram scale to weigh them daily, clean towels and a kitten milk replacer for backup. Here’s a kittening kit on Amazon.
See kittening supplies on Amazon →Some links here are affiliate links: buy through one and Animalsss may earn a small commission, at no extra cost to you. It never changes the dates on this page.
Where these numbers come from
- American Kennel Club — “Dog Pregnancy: Signs, Care & Preparing for Puppies” — The breeder-facing guide to canine gestation (~63 days), the week-by-week timeline, the pre-labour temperature drop and when an x-ray can count the litter.
- Merck Veterinary Manual — “Management of the Pregnant Dog / Queen” — The clinical reference for gestation length in dogs and cats and for the normal course of pregnancy and parturition.
- VCA Animal Hospitals — “Pregnancy and Parturition in Dogs / Cats” — The owner-facing veterinary explainer for the signs of pregnancy, when a scan or blood test confirms it, and what a normal birth looks like.
- Cornell Feline Health Center — feline reproduction — The veterinary source for queen gestation (~63–65 days) and the course of feline pregnancy.
Questions owners ask
How long are cats pregnant?
About 63 to 65 days — roughly nine weeks. Counting from the mating date it’s usually somewhere between 61 and 72 days, because the fertile window spans a few days. That’s why this tool gives a due date and a window rather than one exact day.
What is ‘pinking up’?
Around day 15–18 a pregnant queen’s nipples enlarge and turn pink — often the earliest outward sign, before her belly shows. It’s a clue, not proof; an ultrasound from about day 21–25 is how a vet confirms the pregnancy.
How can I tell how many kittens she’s having?
Reliably, only with an x-ray from about day 40–45, once the kittens’ bones show, or an ultrasound. Belly size is a poor guide. Ask your vet for a count so you know what to expect during the birth.
When can a vet confirm the pregnancy?
An ultrasound from around day 21–25 confirms it and shows the heartbeats; an x-ray from about day 40–45 counts the kittens. A vet can also feel the developing kittens by gentle palpation in the third to fourth week.
Is a cat due-date calculator accurate?
Treat it as a good guide, not a promise. The mating date isn’t the exact conception date, so the window is real. For confirming the pregnancy, counting the litter, or anything worrying, your vet — who can scan and examine her — is the authority.
More free pet tools: how much to feed the mother · how old your cat is in human years · what a cat really costs · which human foods cats can and can't eat · names for the litter
Menu