Enter the date your cat mated. You get the most likely date the kittens arrive, plus the earliest and latest dates.
Cat pregnancy calculator
Mating date.
Most likely due date
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Cats ovulate in response to mating, and the Merck Veterinary Manual gives about 65 days of gestation (64 to 66 days). If there were several matings, count from the first and the last to see the full window.
How the dates are worked out
Cats are induced ovulators: mating triggers ovulation. The Merck Veterinary Manual puts gestation at about 65 days, or 64 to 66 days counted from the hormone surge that mating causes. Because that surge follows mating closely, the mating date is a good starting point.
If your cat mated over several days, run the calculator for the first and the last date to see the full window.
Talk to your vet early about a birthing plan and when to call them.
Sources
- Merck Veterinary Manual, Approximate Gestation Periods. Checked October 25, 2026.
- Merck Veterinary Manual, Whelping and Queening. Checked October 25, 2026.
Frequently asked questions
How long are cats pregnant?
About 65 days, or 64 to 66 days, according to the Merck Veterinary Manual.