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Cat Pregnancy Due Date Calculator (Queening Date)

Estimate when a pregnant cat will give birth from the mating date — the 63–65-day feline gestation and its 58–70-day range — with the timeline for "pinking up", ultrasound, palpation, X-ray kitten count, diet changes, nesting and the signs that labour needs a vet.

Date of mating (or first day of the mating window)

Length of the mating window / time with the tom

First litter?

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How it works

queening ≈ mating + 63–65 days (typical 64; full range 58–70)

Cats are induced ovulators — the act of mating triggers ovulation a day or two later — so gestation counted from mating is fairly tight at 63 to 65 days, with the spread coming mainly from queens that mate over several days. The outward signs track the kittens' growth: the nipples redden around two and a half weeks as blood flow to the mammary tissue increases, embryos are palpable as discrete swellings before they merge into a general enlargement, and the skeletons are dense enough to X-ray only after six weeks, which is the reliable way to know how many to expect and therefore when the birth is finished.

Worked example

A queen mated on 1 March with a single day of access is expected to kitten around 4 May (day 64), with a window of 1 to 7 May. She should "pink up" around 16–19 March, an ultrasound can confirm from 21 March, an X-ray count from 12 April, and the nesting box should be ready by 25 April.

Frequently asked questions

Can she be pregnant by more than one tom?

Yes — superfecundation is common in cats that mate with several males during the same heat, so one litter can have kittens of different fathers and looks.

How do I know when she has finished?

Match the count to the X-ray, and expect her to settle and nurse. Rest periods of several hours between kittens happen, but straining without progress or a kitten count short of the X-ray after 24 hours needs a vet.

Related calculators

Dog Pregnancy Due Date Calculator (Whelping Date)

Estimate when a dog will whelp from the mating date, ovulation date or LH surge — the 63-day gestation with its realistic window — plus the timeline for relaxin testing, ultrasound, X-ray puppy count, temperature monitoring and whelping-box preparation.

Cat Calorie Needs Calculator (RER / MER)

Calculate how many calories your cat needs per day — resting energy requirement × the WSAVA/AAHA factor for neutered, intact, indoor, senior, kitten, pregnant, nursing, weight-loss or weight-gain cats — then turn it into grams or cups of dry food, cans of wet food or a mix, per meal, with a treat budget and a week-by-week weight-loss plan.

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Estimate a found or rescued kitten's age from its weight and developmental signs — eyes, ears, walking, teeth — then get the expected weight for that age, feeding frequency, litter training, the vaccination and deworming schedule and the spay/neuter window.

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Turn your cat’s age into human years with the standard feline curve — a fast first two years, then about four human years each year after.

General veterinary guidance and rules of thumb (WSAVA / AAHA nutrition and reproduction references). Every animal differs — confirm feeding amounts, pregnancy timing and any concern with your veterinarian, especially for kittens, puppies, seniors and animals with medical conditions.