Cat Pregnancy Calculator

How to Use the Cat Pregnancy Calculator

The calculator turns the date your cat was mated into an estimated kitten due date, then tells you which pregnancy week she is in today. It is built around the feline gestation period of 63–65 days (about 9 weeks). Here is how to use it:

• Mating date: Enter the date your cat was mated or bred. If she mated over several days, use the first mating date for a conservative earliest due date.
• Due date: The tool adds roughly 63–65 days to estimate when the kittens are likely to arrive, along with a normal window of 58–67 days.
• Current week: Based on today's date, it shows how far along your cat is so you can follow the right week-by-week care steps.

Treat the result as an estimate, not an exact date. Cats can deliver a few days either side of the average, so use the window rather than a single day when planning.

Cat Pregnancy Week by Week

Feline pregnancy runs across roughly nine weeks, split into three trimesters. This timeline shows the main changes to expect and what your cat needs at each stage.

Cat Gestation Chart: Mating Date to Due Date

This chart shows the estimated earliest, average, and latest due dates counted from the mating date, using the 58-day, 64-day, and 67-day marks of the feline gestation period.

Signs Your Cat Is Pregnant

Early feline pregnancy is subtle, but a handful of reliable signs appear over the first few weeks. A vet can confirm pregnancy by ultrasound from around week 3–4.

• Pinking up: The nipples become rosier and enlarged, usually around week 3. This is often the first noticeable sign.
• Increased appetite: Most queens eat more as the pregnancy progresses, especially from week 5 onward.
• Mild morning sickness: Some cats show brief nausea or reduced appetite in weeks 3–4.
• Abdominal swelling: A rounded belly becomes visible from about week 5, growing steadily until birth.
• Behaviour changes: Increased affection, more sleep, and later, nesting behaviour as the due date nears.

Caring for a Pregnant Cat

Good nutrition and a calm environment give the kittens the best start. These are the essentials for supporting a pregnant queen:

• Switch to kitten food: From around week 4, move her onto high-quality, calorie-dense kitten food to fuel the growing litter.
• Feed more freely: From weeks 5–6, offer food free-choice (ad libitum) as her appetite and needs rise.
• Keep water available: Fresh water should always be within easy reach.
• Avoid raw food: Raw diets can carry pathogens that are harmful to foetuses, so stick to cooked or commercial kitten food.
• Prepare a nesting box: By weeks 7–8, provide a quiet, warm, private box lined with soft bedding where she can give birth.
• Vet check-ups: Schedule at least one prenatal visit and discuss any medications, as many are unsafe during pregnancy.

Worked Examples: Estimating Your Cat's Due Date

Seeing the math applied makes it easier to plan. Here are three examples using the 63–65 day average feline gestation period.

Signs Your Cat Is About to Give Birth

In the final days before queening, your cat's behaviour shifts noticeably. Watching for these signs helps you be ready and know when something is wrong.

• Nesting: She seeks out quiet, hidden spots and settles into the nesting box.
• Restlessness and grooming: Pacing, vocalising, and excessive grooming of the genital area are common.
• Drop in temperature and appetite: Many queens refuse food and their body temperature dips in the 24 hours before labour.
• Panting and contractions: Heavy breathing and visible abdominal contractions signal that labour is starting.
• When to call the vet: Contact your vet if strong contractions last more than 2 hours with no kitten, or if there are signs of distress.