Cat Pregnancy Calculator
Estimate when a pregnant cat will give birth.
About the Cat Pregnancy Calculator
Enter the date your cat mated to see the expected kittening date and the normal window around it, so you can prepare a quiet nesting box in good time.
Cat pregnancy (gestation) averages about 63–65 days, with a normal range of roughly 61–72 days from mating.
The formula
Due date ≈ mating date + 65 days (range 61–72)
Worked example
Mated on 1 January 2026
- 1 January + 65 days = Saturday 7 March 2026
- Normal window: about 3 to 14 March
Things to keep in mind
- Mating dates are often uncertain with outdoor cats; a vet can confirm pregnancy by ultrasound from about three weeks.
Questions people ask
When should I call the vet?
If active straining lasts over 30–60 minutes without a birth, or there's green discharge with no newborn.
Should I change the diet?
Switch to a growth/puppy or kitten food in the last third of pregnancy, on vet advice.
How can I tell if my cat is pregnant?
Pink, enlarged nipples (pinking up) around 3 weeks and a growing belly; a vet can confirm it.