How to use the cat pregnancy calculator
- Enter the date she mated. Queens often mate several times over a few days; use the date you think it happened, or the first one.
- Read the most likely birth dates (days 63–65), the full normal window and how far along she is.
If you are not sure when she mated, your vet can estimate how far along she is.
The formula
Most likely due = mating date + 63 to 65 days. Normal window = mating date + 60 to 67 days.
Both figures come from VCA Animal Hospitals (“Pregnancy and Parturition in Cats”). Cats ovulate in response to mating, so the mating date is a good starting point, though not exact if she mated over several days.
Milestones:
- Days 16–20: “pinking up” of the nipples (PetMD)
- About day 45: kittens’ skeletons show on X-ray, so they can be counted (VCA)
- Days 60–67: normal time for birth (queening)
Tips
- Feed her more. Pregnant and nursing cats need much more food; a kitten food is often used. See the cat food calculator and talk to your vet.
- Prepare a nest. A quiet, warm box with clean towels, away from busy areas, a week or two before the due date.
- Know when to call the vet: strong straining without a kitten, a kitten stuck for long, heavy bleeding, or a queen who seems very unwell.
- Kitten care: WSAVA advises starting kitten core vaccines at 6–8 weeks.
Sources
- VCA Animal Hospitals: Pregnancy and Parturition in Cats (60–67 days, average 63–65; X-ray at about day 45; nutrient needs).
- PetMD: Cat Pregnancy and Kittens guide (pinking up at about 16–20 days).
Frequently asked questions
How long is a cat pregnant?
About nine weeks. VCA Animal Hospitals says cat pregnancy ranges from 60 to 67 days, averaging 63 to 65 days from mating.
How long is a cat pregnant in weeks?
About 9 weeks: the normal 60–67 day range is roughly 8½ to 9½ weeks.
How can I tell how far along my cat is?
If you know the mating date, count the days; the calculator shows the day and week. Otherwise look at the signs: nipples “pink up” at about 16–20 days (PetMD), the belly grows in the second half, and an X-ray from about day 45 shows the kittens’ skeletons (VCA). Your vet can estimate the stage by ultrasound or X-ray.
How many kittens will my cat have?
It varies: a litter can be anything from one kitten to a large litter, and around four is common. An X-ray from about day 45 lets your vet count the kittens’ skeletons, which also helps you know when she has finished giving birth.
When do pregnant cats start showing?
The nipple changes (“pinking up”) come first, at about 16–20 days (PetMD). The belly usually becomes noticeable in the second half of the pregnancy, though it is harder to see in an overweight cat or one carrying only one or two kittens.