Cat Pregnancy Calculator
Updated
Quick answer
How long are cats pregnant?
Cats are pregnant for about 64 days from mating, just over nine weeks, and most litters arrive between day 60 and day 67. Enter the mating date above to get a due date plus a dated queening calendar with every milestone.
| Milestone | Day |
|---|---|
| Pinking up (nipples) | 16–20 |
| Ultrasound can confirm | from 18 |
| X-ray kitten count | 42–47 |
| Due date | 64 |
What is a cat's gestation period?
A cat's gestation period is about 64 days from mating, with most litters arriving between day 60 and day 671. Cat due dates are unusually predictable for one biological reason: cats are induced ovulators. Mating itself triggers ovulation, so conception follows mating within a day or two, and the calendar starts from a known point. Dogs offer no such courtesy, which is why their due-date windows run wider.
Nine weeks is not much time to prepare. The calculator above turns the mating date into the full schedule: confirmation windows, the X-ray kitten count, and when to set up the queening box.
How to use this calculator
- Enter the mating date. If there were several, use the first.
- Read the due date and its normal range, then work down the queening calendar: every milestone comes with its own dates.
Cat pregnancy timeline: week by week
The same schedule the calculator personalizes, as day offsets from mating:
| Days | Week | Milestone |
|---|---|---|
| 16–20 | 3 | Pinking up |
| 18–25 | 3–4 | Ultrasound window |
| 21–28 | 3–4 | Morning sickness window |
| 25–30 | 4–5 | Relaxin blood test |
| 30–40 | 5–6 | Visible changes |
| 42–47 | 6–7 | Skeleton X-ray window |
| 50–56 | 8 | Prepare the queening box |
| 60 | 9 | Watch for labor signs |
| 64 | 10 | Due date |
How to tell if your cat is pregnant
The earliest visible sign is pinking up: from about day 16, her nipples turn pinker and more prominent2. A brief appetite dip or occasional vomiting can follow around week 3 to 4, then the pattern reverses and she eats noticeably more as the belly rounds out from week 5.
For certainty, vets have three tools3: an ultrasound shows the pregnancy from about day 18 and heartbeats from about day 25; a relaxin blood test works from about day 25; and an X-ray between days 42 and 47, once kitten skeletons mineralize, is the only reliable way to count kittens. Human home pregnancy tests don't work on cats; they detect a hormone cats never produce. For the stage-by-stage version of what you'll see, read how to tell if your cat is pregnant.
How many times a year can a cat get pregnant?
Three litters a year is realistic for an unspayed cat with outdoor access, and more is possible. Cats cycle repeatedly through the warm months, can conceive as early as 4 months old, and can come back into heat within weeks of giving birth, even while nursing1. With about 64 days of pregnancy and roughly two months of nursing, the math stacks up frighteningly fast, which is why vets recommend spaying by 5 months if kittens aren't the plan.
Signs labor is close
In the final days you'll typically see restlessness, nesting in the queening box (or your wardrobe, if the box came too late), calling, extra litter-box visits, and refusing food. Her rectal temperature may drop below 99°F (37.2°C) about a day before delivery3. Most queens handle birth without help; your job is quiet, warmth, and watching from a respectful distance.
Call your vet immediately if day 67 passes with no labor, if hard straining goes 30 to 60 minutes without a kitten, or if green or foul-smelling discharge appears before the first kitten3.
How it works
Cat pregnancies keep better time than almost anything else in pet life, because mating itself starts the clock: it triggers ovulation, so conception follows within a day or two. Nine weeks later, kittens. The calculator turns that reliable clock into a dated schedule.
The due date is mating date + 64 days. Parturition occurs 64 to 66 days from the hormonal surge triggered by mating1; owner-facing guidance spans 60 to 67 days from the mating date, which is the range shown.
The queening calendar maps each milestone to its documented window: pinking up from day 16, ultrasound from day 18, relaxin testing from day 25, skeletal X-rays from day 42, and labor watch from day 6023.
All date math runs in UTC days, so daylight-saving changes never shift a milestone.
Frequently asked questions
How long is a cat pregnant?
About 64 days from mating, with most litters arriving between day 60 and day 67. That is just over nine weeks, and noticeably more predictable than in dogs, because mating itself triggers ovulation in cats.
How long are cats pregnant in months?
A little over two months. A cat mated in early March typically delivers in the first half of May.
How do I know if my cat is pregnant?
The classic early sign is "pinking up": from about day 16, her nipples turn pinker and more prominent. For certainty, a vet can see the pregnancy on ultrasound from about day 18 and confirm heartbeats from about day 25.
How young can a cat get pregnant?
As early as about 4 months old, while still very much a kitten herself. That is why vets recommend spaying by 5 months if you are not planning a litter.
Can a cat get pregnant while nursing?
Yes. A queen can come back into heat within weeks of giving birth, even while nursing her current litter. Back-to-back pregnancies are the norm in unspayed cats with outdoor access.
How many kittens are in a litter?
Commonly three to five, though anywhere from one to eight or more happens. An X-ray between days 42 and 47, once kitten skeletons mineralize, gives you the count.
When should I call the vet during queening?
Call right away if day 67 passes with no labor, if she strains hard for 30 to 60 minutes without producing a kitten, if there is green or foul-smelling discharge before the first kitten, or if more than two hours pass between kittens when you know more are coming.
References
- 1.Merck Veterinary Manual. Management of Reproduction of Cats. merckvetmanual.com
- 2.PetMD. Cat Pregnancy: Signs, Stages and Care. petmd.com
- 3.VCA Animal Hospitals. Pregnancy and Parturition in Cats. vcahospitals.com
