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Cat pregnancy calculator

Enter the breeding date to see when the kittens are due.

Enter the date to see when the birth is expected.

Have your vet confirm and follow the pregnancy.

Why only a time window?

Cats only ovulate after mating and often mate several times over a few days (Merck, International Cat Care). Merck gives 60 to 65 days of pregnancy and birth usually 64 to 66 days after breeding; International Cat Care says 63 to 65 days. That gives the window of day 60 to 66.

When to call your vet

  • More than 1 to 4 hours between kittens (Merck).
  • Straining for 20 to 30 minutes without a kitten, or crying out in pain (International Cat Care).
  • Discolored or very bloody discharge before the first kitten (International Cat Care).
  • If the window has passed and labor hasn’t started, call.

The short answer

Cats are pregnant for about 63 to 65 days (International Cat Care). Merck gives 60 to 65 days and birth usually 64 to 66 days after breeding. Example: breeding on March 1, 2027 – the kittens are due between April 30 and May 6, most likely May 3 to 5.

How we calculate: formulas and sources

Questions

How long are cats pregnant?

About 63 to 65 days (International Cat Care); Merck gives 60 to 65 days.

Why is the due date uncertain?

Cats only ovulate after mating and often mate several times over a few days, so it’s usually unclear which day counts (Merck, International Cat Care).

When should I take my cat to the vet?

If she strains for 20 to 30 minutes without a kitten, cries out in pain, or more than 1 to 4 hours pass between kittens (International Cat Care, Merck).

What should I feed a pregnant cat?

Discuss that with your vet. Portiopet doesn’t calculate amounts for pregnant cats.

Sources (4)