Cat Pregnancy Calculator
When is your cat due? This free cat pregnancy calculator turns the mating date into a kitten due date and birth window, shows how far along she is today and what’s happening this week, lays out the full week-by-week pregnancy timeline with real dates, adjusts for breed (including Persian and Siamese), and — if you don’t know the mating date — estimates her stage from the signs you can see.
How the Cat Pregnancy Calculator Works
The five tools cover the due date, how far along she is now, the week-by-week timeline, due dates by breed, and a sign-based estimator.
How Long Are Cats Pregnant?
A cat is pregnant for an average of 63 days, which is about nine weeks or just over two months. Anything from 58 to 72 days is considered normal. Kittens born before about day 58 are often too premature to survive, while a cat still pregnant past day 70 should be seen by a vet. The exact length varies with the individual cat, the breed, and the size of the litter — and because a queen in heat may mate several times over a few days, the true conception date can be a little fuzzy, which is why the result is a window rather than a single guaranteed day.
| Measure | Value |
|---|---|
| Average gestation | 63 days (~9 weeks) |
| Normal range | 58–72 days |
| In months | About 2 months |
| Due date formula | Mating date + 63 days |
| See a vet if | Past day 70, or any distress |
Cat Pregnancy Timeline, Week by Week
Knowing roughly what happens at each stage helps you support your cat and spot problems early. These are typical milestones for a 63-day pregnancy; the Week-by-Week tab prints them against your own dates.
| Stage | Days | What happens |
|---|---|---|
| Weeks 1–2 | Days 1–14 | Conception and early development; no visible signs. |
| Week 3 | Days 15–21 | “Pinking up” — nipples turn pink, swollen and more noticeable. |
| Weeks 4–5 | Days 22–35 | Appetite increases; mild weight gain. Ultrasound can confirm from ~day 25. |
| Weeks 6–7 | Days 36–49 | Belly rounds out; kittens grow fast. X-ray can count the litter from ~day 45. |
| Weeks 8–9 | Days 50–63+ | Nesting, milk comes in, temperature drops; labour approaches. |
Signs Your Cat Is Pregnant
Early pregnancy is easy to miss. The first reliable visible sign is usually “pinking up” around days 15–18, when the nipples become pink, enlarged and more obvious. Over the following weeks you may notice an increased appetite and gradual weight gain, a rounded belly from around weeks 5–6, and sometimes kitten movement in the last few weeks (never press hard on the abdomen to feel for it). Behaviour often changes too — some queens become more affectionate or calmer, and in the final stretch they start nesting. None of these is proof on its own: there is no reliable at-home pregnancy test for cats, so the only way to be certain is a vet visit, where an ultrasound (from ~day 25) or X-ray (from ~day 45) confirms the pregnancy and, with an X-ray, counts the kittens.
The Stages of Labour
When the due date arrives, labour (parturition) comes in three stages. Stage one lasts roughly 6 to 36 hours: the queen is restless, may pace, pant or vocalise, and settles into her nesting box as contractions build. Stage two is the delivery itself — kittens usually arrive every 10 to 60 minutes (occasionally up to two hours apart), each in its own sac that the mother licks away. Stage three is the passing of a placenta after each kitten. Contact your vet urgently if your cat strains hard for more than 20–30 minutes without producing a kitten, more than two hours pass between kittens while you believe more are coming, or the mother seems weak or distressed. Have your vet’s out-of-hours number ready before the due date.
Frequently Asked Questions
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