What Is the Cat Pregnancy Calculator?
The Cat Pregnancy Calculator estimates when your queen (female cat) is likely to give birth to her kittens. Feline gestation is relatively short and consistent, averaging about 65 days — roughly nine weeks. By entering the mating or breeding date, you instantly get an estimated due date plus a realistic delivery window so you can prepare a nesting box, schedule a vet check, and watch for signs of labour.
How to Use It
Select the date your cat was mated. The calculator defaults to a 65-day gestation, but you can adjust the average length between 58 and 72 days if your breed or vet's advice differs (for example, Siamese and Oriental breeds sometimes carry slightly longer). Press calculate to see the projected due date, how many days remain from today, and the earliest (61-day) and latest (69-day) expected delivery dates.
The Formula Explained
The core calculation is simple date arithmetic:
$$\text{Due Date} = \text{Mating Date} + 65 \text{ days}$$
Because the exact moment of conception can vary by a day or two after mating, and litters can arrive early or late, the tool also reports a window of 61 to 69 days. Delivery before 61 days or after 70 days warrants a call to your veterinarian.
Worked Example
Suppose your cat was mated on 1 March 2024. Adding 65 days gives an estimated due date of 5 May 2024. The earliest realistic delivery (61 days) is 1 May 2024, and the latest (69 days) is 9 May 2024 — so you should be ready for kittens from early May onward.
FAQ
How long are cats pregnant? On average 63–65 days, with normal full-term delivery anywhere from 61 to 69 days after mating.
Can I tell the exact conception date? Not precisely — cats are induced ovulators and may mate multiple times, so the calculator uses the mating date as the reference point.
When should I see a vet? Confirm pregnancy around 3–4 weeks via ultrasound or palpation, and consult your vet if delivery hasn't begun by about day 70 or if the queen shows signs of distress.
