Estimate a doe’s kidding date from the breeding date. Caprine gestation averages 150 days — about five months.
Select the species and the mating date, and the tool returns the expected delivery date plus a likely window. Average gestation lengths are well documented per species, but the exact day varies with breed, litter size, parity and the individual dam.
The estimated due date is calculated by adding the species-average gestation length, in days, to the breeding (or confirmed conception) date. For example, cattle average 283 days, dogs 63 days and horses 340 days.
Because gestation length varies by breed, litter size and individual animal, the result is an estimate, not a guarantee. The tool also shows a window around the due date — roughly five days for large animals and two days for small ones — so you can plan calving, whelping or foaling supervision with a safe margin. Always confirm pregnancy and timing with your veterinarian.
| Species | Average gestation (days) | Approximate |
|---|---|---|
| Cattle / Cow | 283 days | ~9 months |
| Dog | 63 days | ~9 weeks |
| Cat | 64 days | ~9 weeks |
| Horse / Mare | 340 days | ~11 months |
| Goat | 150 days | ~5 months |
| Sheep / Ewe | 147 days | ~5 months |
| Pig / Sow | 114 days | ~4 months |
| Rabbit | 31 days | ~4 weeks |
| Alpaca | 335 days | ~11 months |
Cattle gestation averages about 283 days, or roughly nine months and one week. Individual cows range from about 279 to 287 days depending on breed and calf size, which is why this cattle gestation calculator shows a window around the estimated calving date.
Dogs are pregnant for about 63 days from conception and cats about 64 days — close to nine weeks for both. Whelping or queening can occur a couple of days either side of the estimate, especially with large litters.
It uses well-established species-average gestation lengths, so the estimate is reliable for planning. Actual delivery still varies by a few days because of breed, litter size, parity and the individual dam. Treat the due date as the center of a window, not a fixed appointment.
Add the average gestation length for the species to the breeding or conception date. This animal due date calculator does it automatically: pick the species, enter the mating date, and it returns the estimated due date plus an earliest-to-latest window.
Yes. Within a species, breed, body size and litter size all shift gestation by several days. Smaller dog breeds and larger litters often deliver slightly earlier, while some cattle breeds carry a little longer. The window shown accounts for this normal variation.
Yes. The calculator covers horses (about 340 days), goats (about 150 days), sheep, pigs, rabbits and alpacas in addition to cattle, dogs and cats. Select the species and the tool applies the correct gestation length.
Veterical helps breeders and veterinary clinics track pregnancies, due dates, appointments and patient histories — start free.