How this calculation works
The Cat Pregnancy & Queening Due Date Calculator calculates your pregnant cat's expected delivery date (average 65-day feline gestation) and details developmental stages from pinking-up through kitten delivery.
Mathematical formula and logic
Queening Due Date = Mating Date + 65 Days (normal range: 63 to 67 days).
Worked example
For a mating on August 1, 2026: Expected delivery date is October 5, 2026 (65 days gestation). 'Pinking up' of nipples appears around Day 21 (August 22), and nesting behavior begins around Day 60 (September 30).
Calculation assumptions
- Average feline gestation period is 65 days (ranges from 63 to 67 days).
- Cats are induced ovulators (ovulation occurs 20-50 hours after mating).
Frequently asked questions
How long are cats pregnant for?
A cat's gestation period averages 65 days (approximately 9 weeks), typically ranging between 63 and 67 days.
What is 'pinking up' in pregnant cats?
Around Day 21 of pregnancy, a pregnant cat's nipples become noticeably enlarged, firmer, and turn a distinct bright pink color—often the earliest visible physical sign of pregnancy.
When should I prepare a nesting box for my pregnant cat?
Set up a quiet, warm, draft-free nesting box lined with clean towels around Day 55 to 60 so the mother cat can familiarize herself with the birthing area.
How many kittens are in an average litter?
An average cat litter contains 4 to 6 kittens, although first-time mothers may have smaller litters of 2 to 3 kittens.
Can a cat get pregnant again immediately after giving birth?
Yes, female cats can enter estrus (heat) and become pregnant again as early as 2 to 3 weeks after giving birth, even while nursing kittens.
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