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Cat Pregnancy Calculator

Find out when your cat’s kittens are due. Enter the mating date to see the expected due date, the normal birth window, how far along she is today and a week-by-week calendar with the key milestones.

Mating date

If she mated over several days, use the first date and allow a few extra days.

Enter your values to see the result.

How to use the Cat Pregnancy Calculator

Enter the mating date; if she mated over several days, use the first one.
Press Calculate due date to see the expected due date and birth window.
Check today’s status to see which week she is in.
Use the calendar to plan vet visits, the food change and the nesting box.
Copy or download the dates to keep them handy.

How the cat due date is calculated

Cats are induced ovulators: mating triggers the release of eggs about 24–36 hours later, so the mating date is a good starting point. The calculator adds:

Due date = mating date + 63 days
Usual due window = mating date + 63 to 65 days
Normal range = mating date + 58 to 70 days

Example: mating on June 10 gives a due date of August 12, a usual window of August 12–14 and a normal range of August 7–19.

Cat pregnancy milestones at a glance

Day after mating	Milestone
12–14	Embryos implant in the uterus
15–21	Nipples “pink up” and enlarge
From ~16	Pregnancy visible on ultrasound
17–25	Vet can feel embryos by palpation
From ~28–35	Belly rounds, appetite increases; start kitten food
From ~42–45	Kitten skeletons visible on X-ray (count the litter)
50–60	Nesting behavior; prepare a quiet birthing box
63–65	Most common time for birth
70	Call the vet if no kittens have arrived

Every pregnancy is a little different. Use these dates for planning and rely on your veterinarian for checkups and advice.

Frequently asked questions

How long are cats pregnant?

Cat pregnancy (gestation) usually lasts about 63–65 days, roughly nine weeks, counted from mating. Births between about day 58 and day 70 are generally considered normal.

How do I calculate my cat's due date?

Add 63 days to the mating date. For example, a cat that mated on March 1 is due around May 3, with most births between May 3 and May 5.

When can you tell a cat is pregnant?

The first visible sign is usually “pinking up”: the nipples become pink and enlarged around 15–21 days after mating. A vet can confirm pregnancy by ultrasound from about day 16 or by gentle palpation around days 17–25.

How can I find out how many kittens she will have?

An X-ray from about day 42–45, when the kittens' skeletons have hardened, is the most reliable way to count them. Ultrasound confirms pregnancy earlier but is less accurate for counting. An average litter is about four kittens.

What are signs that labor is near?

In the last day or two a queen often becomes restless, looks for a nest, stops eating, grooms her belly and may pant or purr loudly. A small drop in body temperature can occur about 12–24 hours before labor.

When should I call the vet?

Call your vet if there are no kittens by about day 70, if she strains hard for 30–60 minutes without a kitten, if more than 2–3 hours pass between kittens with more expected, or if there is a foul, green or heavy bloody discharge.

What should a pregnant cat eat?

Most vets advise switching gradually to a high-quality kitten (growth) food from around week 4–5 and feeding small meals often, as her energy needs rise steadily through pregnancy and nursing.

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