Free Cat Pregnancy Calculator
This cat pregnancy calculator gives your cat's due date and a timeline. Enter the mating date to start.
Pregnancy timeline for your dates
How long are cats pregnant?
Cats are pregnant for about 65 days (just over 9 weeks), usually between 63 and 67 days from mating. The cat pregnancy calculator works like a cat gestation calculator: it adds those days to the mating date.
Cat pregnancy timeline
Typical milestones counted from the mating date. Enter a date in the cat pregnancy calculator above to see them on your own calendar.
| Day | Week | What usually happens |
|---|---|---|
| 15 | 3 | Nipples may turn pink ("pinking up"), often the first visible sign. |
| 21 | 3 | A vet can often confirm pregnancy by ultrasound from around days 16–21. |
| 35 | 5 | Weight gain and a rounder belly become noticeable; ask the vet about kitten food. |
| 45 | 7 | An X-ray from around days 40–45 can count kittens. |
| 55 | 8 | Prepare a quiet nesting box; many queens start nesting in the last 10 days. |
| 63 | 9 | Kittens can arrive any day now; call the vet if labour has not progressed within a few hours. |
How the cat pregnancy calculator works out the due date
- Expected: day 65 after mating.
- Usual window: days 63 to 67.
- Several matings: count from the first one, and expect the later end of the window.
Cats can mate with several partners and ovulate only after mating, so the due date is an estimate. Most litters arrive within a couple of days of day 65.
See also the cat food calculator, cat age calculator and the dog pregnancy calculator.
Frequently asked questions
How does the cat pregnancy calculator work?
It adds about 65 days to the mating date, the typical cat gestation, and shows the usual 63 to 67 day window. It works as a cat due date calculator.
How long is a cat pregnant?
About 65 days from mating, usually between 63 and 67 days.
How soon can a vet confirm a cat pregnancy?
Ultrasound can often detect kittens from around day 16–21. An X-ray from around day 40–45 can count them.
What are the early signs?
Around day 15–21 the nipples turn pink and enlarge. Appetite rises, and the belly rounds out from about the fifth week.
When should I call the vet?
Call if labour has not progressed within a few hours, if there is green or bloody discharge before the first kitten, or if the cat is past day 67.