Pet Pregnancy Due Date Calculator
Estimate whelping or kittening date.
Instant results✓ Source-backed
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How this is calculated
Ranges measured from breeding date. In dogs, gestation is a precise 63 ± 1 days from ovulation (progesterone test), but 58–68 days from mating because sperm survive several days. Ultrasound or progesterone timing gives the most accurate date.
Source-based educational tool; not independently reviewed by a veterinarian. Cited guidance does not imply endorsement by its authors.
Formula
Due date = mating date + mean gestation Dog 63 (58–68) · Cat 65 (61–72) · Rabbit 31 (29–35) · Horse 340 (320–370) days
Assumptions
- •Counted from first mating, not ovulation
- •Single mating date