Cat Pregnancy Calculator
Estimate your cat's kittening (due) date from the mating date. Get the Day 64 due date, the normal 61 to 72 day window, plus the current day and stage of pregnancy.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Cat Pregnancy Calculator Works
This calculator estimates when your cat (a pregnant female is called a queen) is due to give birth. Enter the mating or breeding date, and the tool returns the expected kittening date, the normal delivery window, and — if mating has already happened — the current day and stage of pregnancy.
The Calculation
Estimated due date = mating date + 64 days Normal window = mating date + 61 to 72 days
Average feline gestation is about 63 to 65 days, or roughly nine weeks. Cats can mate more than once during a heat cycle, so the exact conception date may vary slightly — the 61 to 72 day window covers this.
Cat Pregnancy Stages
| Stage | Approx. days | What happens |
|---|---|---|
| Early | 0–20 | Fertilisation and implantation; few outward signs |
| Mid | 21–41 | Kittens develop; belly begins to round, nipples “pink up” |
| Late | 42–57 | Rapid growth; queen eats more and slows down |
| Nesting | 58+ | Queen seeks a quiet nest; kittening is imminent |
How to Use It
- Pick the mating date on the calendar.
- Read the Day 64 due date and the earliest and latest likely dates.
- If mating has passed, check the current day and stage of the pregnancy.
Caring for a Pregnant Cat
- Feed a high-quality kitten food in the final weeks for extra calories.
- Provide a warm, quiet nesting box in a low-traffic area before week 8.
- Book vet check-ups to confirm the pregnancy and monitor litter health.
- Keep her indoors late in pregnancy so she does not deliver somewhere unsafe.
This is an estimate to help you prepare. Every cat is different, so always rely on your veterinarian for confirmation and care guidance throughout the pregnancy.
Frequently asked questions
How long is a cat pregnant?+
Feline gestation averages about 63 to 65 days, roughly nine weeks. Most healthy litters arrive within a window of 61 to 72 days after mating, so a few days either side of the estimated due date is completely normal.
How does the cat pregnancy calculator estimate the due date?+
It adds 64 days to the mating date to give the expected kittening date, then shows the normal 61 to 72 day window. If the mating date is in the past, it also reports the current day and stage of the pregnancy.
What are the signs a cat is about to give birth?+
In the last days a queen often nests, seeks a quiet hidden spot, refuses food, becomes restless and her body temperature drops. Visible contractions and a clear or slightly bloody discharge signal that labour is starting.
How many kittens are in a typical litter?+
A typical litter is 4 to 6 kittens, though it can range from 1 to 8 or more. First-time mothers and very young or older queens often have smaller litters. A vet can estimate litter size with an ultrasound or x-ray.
When should I take my pregnant cat to the vet?+
Schedule a check-up early to confirm the pregnancy and again in the final weeks to assess litter size and health. Contact a vet urgently if your cat strains for more than an hour without delivering, or seems weak, feverish or distressed.