How the due date is calculated
Feline gestation averages about 65 days from mating. Enter June 26, 2026 and the calculator returns August 30, 2026. Most queens deliver between 63 and 67 days, so the result marks the middle of a brief window.
Counting days by hand is easy to get wrong across month boundaries, which is why the calculator does it for you. If the queen mated over several days, use the first mating date for the earliest possible due date and the last for the latest — that gives you a realistic window to prepare for.
Worth having open at the same time: the days until date calculator.
Signs kittening is near
In the last day a pregnant cat (a “queen”) often seeks a quiet, hidden nest, grooms heavily and may refuse food. Provide a clean, warm kittening box ahead of time. Curious how your cat is aging? Try the cat age calculator.
Earlier milestones help too: a vet can usually confirm pregnancy by ultrasound from around day 21, and an X-ray from about day 45 can count skeletons to estimate litter size. Nipples typically become pink and enlarged around day 18, and appetite climbs sharply through the final three weeks.
Keep the days between dates calculator nearby for the rest of the same job.
How to use this calculator
Select the mating date and the estimated due date appears instantly. For dogs, use the dog pregnancy calculator instead.
Kittens born much before day 60 are often too immature to thrive without intensive care, so note the early edge of your window as well as the due date itself.
Frequently asked questions
- How long are cats pregnant?
- About 65 days on average, typically within a range of 63 to 67 days from mating.
- When is a cat mated June 26, 2026 due?
- Around August 30, 2026 — the mating date plus 65 days.
- Can a cat have kittens from different fathers?
- Yes. A single litter can have multiple fathers if the queen mates with more than one male during her cycle.
- Should I involve a vet?
- Yes. A vet can confirm the pregnancy, estimate litter size and advise on nutrition and timing.
- What if my cat goes past the due date?
- A few days either side of day 65 is normal, but a queen who has not delivered by day 70 should be seen by a vet. Straining for more than an hour without producing a kitten also warrants a call straight away.