Cat Pregnancy Calculator — Due Date & Gestation
Estimate your cat's due date and current gestation week from the mating date, using the typical 63-65 day feline pregnancy.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Due Date = Mating Date + 65 days
The average feline gestation period is 65 days (approximately 9 weeks) from the date of mating. Normal range is 60 to 70 days. Cats are induced ovulators, so ovulation typically occurs 24-48 hours after mating. Development stages include organ formation (weeks 3-4), fetal growth (weeks 5-6), rapid growth (weeks 7-8), and pre-birth (week 9+).
Worked Examples
Example 1: Early Pregnancy Timeline
Problem:A domestic shorthair cat was observed mating on February 10, 2026. When is she due, and what stage is she at on March 1?
Solution:Gestation period: 65 days\nDue date: February 10 + 65 days = April 16, 2026\nDays passed (Feb 10 to Mar 1): 19 days\nCurrent week: Week 3\nDevelopment stage: Organ Formation (Weeks 3-4)\nDays remaining: 65 - 19 = 46 days\nNext vet visit: Day 21 — initial pregnancy confirmation (ultrasound)
Result:Due date: April 16, 2026 | Week 3 | 46 days remaining
Example 2: Late-Stage Pregnancy Check
Problem:A Siamese cat mated on January 5, 2026. What is her status on March 1?
Solution:Gestation period: 65 days\nDue date: January 5 + 65 days = March 11, 2026\nDays passed (Jan 5 to Mar 1): 55 days\nCurrent week: Week 8\nDevelopment stage: Rapid Growth (Weeks 7-8)\nDays remaining: 65 - 55 = 10 days\nMilestone: Day 58 — kittens ready for birth, milk production starts
Result:Due date: March 11, 2026 | Week 8 | 10 days remaining
Frequently Asked Questions
How long is a cat's pregnancy?
A cat's pregnancy typically lasts about 63 to 67 days, with the average being approximately 65 days from the date of mating. However, the actual gestation period can range from 60 to 70 days depending on the breed, the individual cat, and the timing of ovulation relative to mating. Siamese and other Oriental breeds sometimes carry for a day or two longer, while shorter-haired breeds may deliver slightly earlier. Cats are induced ovulators, meaning ovulation occurs in response to mating, which can make pinpointing the exact conception date easier than in some other species. If you know the mating date, counting forward 65 days gives a reliable estimate for planning purposes.
What are the signs that a cat is pregnant?
Early signs of cat pregnancy include pinking up of the nipples around days 15 to 18, where the nipples become noticeably more pink and enlarged. Around weeks three to four, some queens experience morning sickness with occasional vomiting, though this passes quickly. By week four, you may notice gradual weight gain and a slightly rounded belly. Appetite typically increases during weeks four through six as the kittens grow rapidly. Behavioral changes include increased affection and seeking quiet, secluded spots for resting. In the final weeks, the queen's belly becomes noticeably large, you may see or feel kitten movement, and she will begin nesting behavior — seeking out warm, enclosed spaces to prepare for delivery. Mammary gland enlargement and milk production typically begin in the last week.
When should I take my pregnant cat to the vet?
The first veterinary visit should be scheduled around day 21 after mating for an ultrasound to confirm the pregnancy and check for viable embryos. A second visit around day 30 allows the vet to assess the queen's overall health, recommend dietary changes, and check for any complications. Around day 45, an X-ray can provide an accurate kitten count since the skeletons are now calcified and visible, which helps you know how many kittens to expect during delivery. A pre-birth checkup around day 58 ensures everything is progressing normally and the queen is ready for labor. Contact your vet immediately if you notice vaginal bleeding, foul-smelling discharge, prolonged loss of appetite, extreme lethargy, or if labor hasn't begun by day 70.
How should I prepare for my cat giving birth?
Start preparing about two weeks before the expected due date. Set up a nesting box in a quiet, warm, draft-free area using a large cardboard box or plastic storage container lined with clean towels or blankets. The box should have sides high enough to contain kittens but with one side low enough for the mother to enter easily. Keep the room temperature around 72 to 75 degrees Fahrenheit since newborn kittens cannot regulate their own body temperature. Gather essential supplies including clean towels, sterile scissors and thread for umbilical cords if needed, a bulb syringe to clear airways, a heating pad set on low, a kitchen scale for weighing kittens, and your veterinarian's emergency contact number. Most cats handle delivery without intervention, but be prepared to assist if needed.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy