Cat Gestation Calculator
Enter your queen's breeding date to calculate the expected kittening date and view the cat gestation period timeline. The gestation period for cats averages 65 days — use the calculator below for an exact due date and key milestones.
Cat Gestation Calculator
Free tool — no signup required
How to Use This Calculator
Enter the date your queen was bred using the date picker. Select the breed if known — while most cats have identical gestation lengths, Maine Coon tends to run one day longer. Click Calculate Due Date to see the expected kittening date, the full 60–70 day normal range, and the cat gestation period timeline showing key developmental stages from implantation to delivery.
The calculator saves your last result in the browser, useful if you're managing multiple queens through a breeding season. If your queen was bred over multiple days, enter the first breeding date for the earliest possible due date.
Cat Gestation Period — What to Expect
The gestation period for cats averages 65 days (about 9 weeks), with a normal range of 60–70 days. The house cat gestation period is consistent across all domestic breeds — indoor cats, outdoor cats, purebreds, and mixed breeds all carry kittens for approximately the same length of time.
The gestation period for domestic cats begins at fertilization and is divided into three phases. In the first phase (days 1–21), embryos travel to the uterine horns and implant around day 15. A heartbeat is detectable by ultrasound at day 21. Cats are induced ovulators — mating triggers ovulation, making the breeding date a reliable starting point for the calculation.
During the middle phase (days 21–45), kittens are visible on ultrasound from around day 30, and skeletal structures become visible on X-ray by day 45. The queen's abdomen enlarges noticeably. Her nutritional requirements increase — transition to a high-quality kitten food or food formulated for pregnant and lactating cats during this period.
Late pregnancy (days 45–65): The cats gestation period enters its final phase, with rapid kitten growth. The queen begins nesting behavior around day 55 — provide a quiet, warm kittening box lined with soft bedding. Rectal temperature monitoring is useful from day 60 onward; a drop below 99°F signals delivery within 24 hours.
Most queens kitten without assistance. Active labor involves contractions followed by delivery of each kitten in its individual membrane sac. Kittens are typically delivered 15–60 minutes apart. If a queen has been in active labor for more than 60 minutes without delivering a kitten, contact your veterinarian.
Breed-Specific Cat Gestation Periods
The breed comparison below shows how the gestation period for cats varies across common domestic breeds. Differences are minor — all breeds fall within the normal 60–70 day range.
| Breed | Avg. Gestation (Days) | Notes |
|---|---|---|
| Domestic Shorthair | 65 days | Most common household cat |
| Siamese | 65 days | Vocal during late pregnancy |
| Persian | 65 days | May require C-section due to flat face |
| Maine Coon | 66 days | Largest domestic breed; runs 1 day longer |
| Ragdoll | 65 days | Docile temperament; average gestation |
| Bengal | 64 days | Active breed; slightly shorter on average |
Note: Persian cats have a flat facial structure (brachycephalic) that may complicate natural delivery. Consult your vet about whether a planned C-section is appropriate.
How We Calculate Cat Gestation
The cat gestation calculator uses the formula: Kittening Date = Breeding Date + 65 days. The 65-day average and 60–70 day range are based on data from the Cornell University College of Veterinary Medicine, the Merck Veterinary Manual, and published feline reproduction research. Because cats are induced ovulators, the breeding date directly corresponds to ovulation, making the calculation reliable.
Frequently Asked Questions
Sources & References
- Merck Veterinary Manual — Feline reproduction and pregnancy
- Cornell University College of Veterinary Medicine — Cat pregnancy guide
- Penn State Extension — Small animal reproduction reference
- University of Minnesota Extension — Companion animal gestation data
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Complete comparison chart
GestationCalc Editorial Team
Our editorial team includes animal husbandry specialists, veterinary consultants, and agricultural extension educators. Content is reviewed against peer-reviewed research and guidance from USDA, Penn State Extension, and the Merck Veterinary Manual.
Last reviewed: February 5, 2025