🐱 Cat Pregnancy Calculator
Enter your cat's mating date to get her estimated due date and a week-by-week guide to what's happening — and what to prepare for kitten arrival.
How Long Are Cats Pregnant?
Cat pregnancy (gestation) lasts an average of 63–65 days from the mating date. The normal range is 58–72 days — cats have a wider natural variation than dogs. Most cats deliver between day 63 and day 67. If your cat hasn't delivered by day 70, contact your veterinarian.
The pregnancy is divided into roughly three stages. The first three weeks involve embryo development with few visible signs. Weeks four through six bring noticeable physical changes. The final weeks are focused on growth, nesting, and preparation for birth.
Signs Your Cat May Be Pregnant
- Nipple enlargement and pinking ("pinking up") around weeks 2–3
- Mild nausea or reduced appetite in early weeks
- Increased affection and vocalization
- Visible belly rounding by week 4–5
- Weight gain of 2–4 lbs over the pregnancy
- Active nesting behavior in the final week
Pregnancy Confirmation and Diagnosis: Methods Compared
Unlike dogs, false pregnancy is uncommon in cats — so visible signs like pinking up are more trustworthy on their own. Still, if you want a definite check (or an exact litter count for whelping planning), here's how the diagnostic options compare:
| Method | Earliest reliable timing | Accuracy | What it tells you |
|---|---|---|---|
| Abdominal palpation | Day 17–25 | Moderate — depends on the vet's experience; not recommended to try at home as it can harm early embryos | Rough sense of pregnancy, not a reliable count |
| Ultrasound | Day 21+ | High — the most reliable early confirmation, and can detect fetal heartbeats | Confirms pregnancy and viability (not an exact kitten count) |
| X-ray | Day 42+ (skeletons must be calcified) | High for counting — the only reliable way to count kittens | Exact kitten count, useful for delivery planning |
In practice, most vets confirm with ultrasound around week 4 and follow up with an X-ray after day 42 to get an exact count — knowing the number of kittens in advance helps you recognize when delivery is complete.
What to Prepare
Around week 6, set up a kittening box — a quiet, warm, private space lined with clean towels or newspaper. Introduce your cat to it early so she explores it on her own terms before labor begins.
Schedule a vet visit around week 4 for ultrasound confirmation and kitten count. An X-ray after day 42 gives a more accurate litter size count and helps you know when all kittens have been delivered.
Switch to a high-quality kitten food or an "all life stages" formula from week 4 onward. This supports the rapid growth of kittens in the final weeks and sustains your cat through nursing.
When to Call the Vet Immediately
Strong contractions for more than 30 minutes without a kitten delivered, more than 2–3 hours between kittens with visible straining, dark green or bloody discharge before labor begins, or a temperature drop below 99°F that doesn't lead to labor within 24 hours are all reasons to call your vet right away.
Cats are usually independent birthers and rarely need assistance, but first-time mothers and cats carrying an unusually large or small litter (confirmed by the week 7–8 X-ray) benefit from having an emergency plan in place before labor starts.
Want the full guide? Read: How Long Are Cats Pregnant? A Complete Week-by-Week Guide →
Not sure what to feed her during pregnancy? → What to Feed a Pregnant Cat: Complete Diet Guide
Not sure if she's pregnant yet? → How to Tell If Your Cat Is Pregnant
Frequently Asked Questions
How long are cats pregnant?
Cat pregnancy (gestation) lasts an average of 63–65 days from the mating date. The normal range is 58–72 days. Most cats deliver between day 63 and day 67.
How do I calculate my cat's due date?
Count about 63–65 days from the mating date; most cats deliver between day 63 and day 67. Cats are induced ovulators — mating itself triggers ovulation — so the mating date is a closer anchor for a cat than it is for a dog. It is still a window rather than a guaranteed day. If the cat had access to a tom over several days, count from the first and the last possible date and treat everything in between as the window. A vet can narrow it with ultrasound after day 20 or X-ray after day 42.
What are the signs that a cat is about to give birth?
Within 24–48 hours of labor, most cats become restless, stop eating, and begin intense nesting behavior. They may vocalize more than usual and seek a quiet, enclosed space. Active contractions signal that birth is imminent.
How can I confirm my cat is pregnant?
Ultrasound from around day 21 is the most reliable early confirmation and can detect heartbeats. A vet can sometimes feel the developing kittens by abdominal palpation from about day 17–25, but it is less reliable and is not something to attempt at home. An X-ray after day 42, once the kitten skeletons have calcified, is the only reliable way to count kittens before birth.