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Cat Pregnancy Due Date Calculator

Estimate when your cat's kittens are due.

✔ Reviewed by a licensed veterinarianContent updated 18 Oct 2026Reviewed 18 Oct 2026Sources: Merck Veterinary Manual
Cat Pregnancy Due Date CalculatorFree · instant
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Quick answer. Cats are pregnant for about 63–65 days from mating, and births between day 61 and day 69 are usually normal. Enter the most likely mating date to see your cat's due window. If there are no kittens by day 69, or she strains for 30–60 minutes without producing one, call your vet.

How to use the cat pregnancy due date calculator

  1. Enter the mating date.
  2. Press Calculate.

Worked example

A cat mated on 1 October 2026.

Mating date
2026-10-01
Due 3 Dec 2026 – 5 Dec 2026
Normal window starts
1 Dec 2026
Normal window ends
9 Dec 2026

Example values are illustrative; this result is produced by the same calculator above.

How we calculate it

Gestation ≈ 63–65 days (normal range ~61–69)

Sources: Merck Veterinary Manual

Understanding your result

A queen is pregnant for about 63 to 65 days from mating. The calculator shows that window and a wider range of 61 to 69 days that vets consider normal.

Mating dates can be uncertain for cats that roam, so the dates are best used as a guide.

Use the date range to plan for a quiet nesting place and to know when to contact your vet.

Common mistakes

  • Using a vague mating date and treating the result as exact.
  • Not arranging a vet check during pregnancy.
  • Waiting too long after the latest date.

Good to know

  • No kittens by day 69, straining for 30 to 60 minutes without a kitten, or an unwell cat needs a vet.
  • Pregnant and nursing cats need different food; ask your vet.
  • Spaying options and kitten care can also be discussed with your vet.

When to talk to your vet

  • No kittens by day 69
  • Straining without a kitten for 30–60 minutes
  • Your cat seems unwell

Frequently asked questions

How long are cats pregnant?

About 63–65 days; births between day 61 and 69 are usually normal.

How can I tell if my cat is pregnant?

Pink, enlarged nipples appear around week 3; your vet can confirm by ultrasound.

When will my cat give birth?

Count about 63–65 days from mating. The calculator shows that due window and a wider normal window of day 61 to 69. Because mating can happen on several days, ask your vet to confirm timing with an ultrasound.

When should I call the vet?

Call your vet if there are no kittens by day 69, if your cat strains for 30–60 minutes without producing a kitten, or if she seems unwell at any point during the pregnancy.

What if I am not sure of the mating date?

Cats can mate more than once, so the exact date may be uncertain. Enter the most likely date, treat the result as a window rather than a single day, and let your vet confirm with an ultrasound.

How should I prepare for the birth?

Ask your vet about confirming the pregnancy, feeding and preparing a quiet place for the birth. Pregnant and nursing cats have different feeding needs, so use veterinary advice rather than the standard cat food calculator.

Reviewed by a licensed veterinarian
Last reviewed 18 Oct 2026 · How we review

Sources

  1. Merck Veterinary Manual — Management of Reproduction in Dogs and Cats

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Estimates only. Every pet is different — confirm with your veterinarian. If your pet may have eaten something harmful, contact your vet or an animal poison helpline now.