Cat Pregnancy Calculator
Enter the mating date to find your cat's estimated due date, days remaining and current pregnancy stage.
Average cat gestation is 65 days (range 63–67 days).
Mating date
How Long Is Cat Pregnancy and How Is It Calculated?
Cat pregnancy is much shorter than human pregnancy. Knowing the due date helps you time vet appointments, adjust feeding and prepare for the birth.
Average Cat Gestation Period
Cat gestation varies slightly by breed, but the reference values for all domestic cat breeds are:
| Scenario | Duration |
|---|---|
| Minimum (premature threshold) | 58 days |
| Normal lower limit | 63 days |
| Average (used by calculator) | 65 days |
| Normal upper limit | 67 days |
| Prolonged (vet required) | 70+ days |
How the Due Date Calculation Works
The calculator adds 65 days to the mating date to find the average due date, and also displays the 63–67 day normal range. If you don't know the exact mating day, enter the date of the first mating you saw. The result may then be off by one or two days.
| Stage | Days | Development | Signs |
|---|---|---|---|
| 1st Trimester | Days 1–21 | Embryo formation and implantation | Not externally visible; possible morning sickness |
| 2nd Trimester | Days 22–42 | Organ and skeletal development | Belly growth, movement felt, increased appetite |
| 3rd Trimester | Days 43–65 | Rapid weight gain | Visible belly, swollen teats, nesting behaviour |
What Are the Signs of Cat Pregnancy?
There may be no clear signs in the first few weeks. As the pregnancy progresses, physical and behavioural changes become easier to see.
Physical Changes (Nipples and Weight Gain)
Behavioural Changes (Nesting Instinct)
Nesting Instinct
One to two weeks before birth the cat seeks quiet, dark and enclosed spots. She gathers blankets, towels or clothing. This behaviour signals it is time to prepare a birthing box.
Increased Affection
Some cats want more contact during pregnancy: they climb onto laps and meow more. This is linked to hormonal changes.
Withdrawal / Hiding
Other cats become more introverted and prefer solitude. Both behaviours are normal.
Increased Appetite
Appetite noticeably increases from the 2nd trimester onward. In the final 3 weeks calorie requirements can rise by 25–50%.