Animal Gestation Calculator & When Is It Due?
Dates births for cows
Pick the animal and its breeding date to get the expected calving/birth date, the natural birth window, days remaining, gestation progress, and the dairy dry-off date.
A cow (cattle) bred on 19 Jun 2026 is expected to give birth around 29 Mar 2027 — normally between 22 Mar 2027 and 5 Apr 2027. That's 283 days away (first trimester (early)).
Next: dry off the animal by 28 Jan 2027 (about 60 days before calving), step up nutrition in late pregnancy, and prepare a clean calving area.
Gestation lengths are breed averages — individual births vary by several days. Consult a vet for confirmation and care.
Gestation lengths — key facts
- Cow (cattle)
- ≈ 283 days
- Buffalo
- ≈ 310 days
- Horse / mare
- ≈ 340 days
- Goat
- ≈ 150 days
- Sheep / ewe
- ≈ 147 days
- Pig / sow
- ≈ 114 days
- Dairy dry-off
- ~60 days before due
- Privacy
- Runs in your browser; nothing uploaded
Plan around the due date
Knowing when an animal will give birth lets you plan the things that protect both mother and offspring: stepping up nutrition in late pregnancy, drying off a dairy animal in time, arranging a clean calving space, and being on hand for the birth. This tool adds the species' average gestation to your breeding date for the expected due date, then brackets it with a natural birth window because real births vary by a few days around the average.
It also tracks progress — days elapsed, days remaining and the gestation stage — so you can see at a glance which trimester an animal is in and what care it needs now. For dairy cattle and buffalo it marks the dry-off date about two months before calving, when milking should stop so the udder can rest. Treat the dates as a well-grounded plan and confirm pregnancy and health with your vet.
Predict the birth
Get the due date and natural window for cattle, buffalo, goats, sheep, pigs, horses and pets.
Time the dry-off
See when to stop milking a dairy animal — about 60 days before calving — to protect the next lactation.
Track progress
Know the trimester, days elapsed and days remaining so you give the right care at each stage.
Build a calendar
Use the dates to schedule calving pens, vaccinations and extra feed across the herd.
Frequently Asked Questions
How do I calculate an animal's due date?+
Add the species' average gestation length to the breeding (service) date. For a cow that's about 283 days, so a cow bred on 1 January is due around 11 October. This tool does it for cattle, buffalo, goats, sheep, pigs, horses and more, and also shows the natural birth window around the due date.
How long is a cow's gestation?+
About 283 days on average (roughly 9 months and a week), though it varies by breed — dairy breeds are often a few days shorter and some beef breeds longer. Individual calvings can fall about a week either side of the calculated date.
What are the gestation lengths for other animals?+
Approximate averages: buffalo 310 days, horse 340, goat 150, sheep 147, pig 114, rabbit 31, dog 63 and cat 65. The calculator uses these and adds a natural ± window because real births vary around the average.
What is the dry-off date for a dairy cow?+
For dairy cattle and buffalo, the dry-off date is when you stop milking before calving — usually about 60 days before the due date — so the udder can rest and the animal can build reserves for the next lactation. The tool shows this date automatically for dairy species.
Why is there a birth window rather than one date?+
Gestation length naturally varies by a few days around the average, depending on breed, individual animal, sex of the offspring and litter size. The window (for example ±7 days for cattle) shows the realistic range to expect and prepare for, rather than a single guaranteed day.
How accurate is the calculated due date?+
It's a reliable planning estimate based on average gestation, and most births fall within the shown window. It can't account for an individual animal's tendencies or an uncertain breeding date, so use it to plan and confirm pregnancy and progress with a vet.
What should I do as the due date nears?+
In late gestation, raise the plane of nutrition, reduce stress and handling, and prepare a clean, dry, quiet birthing area. Watch for the signs of imminent birth (udder filling, relaxed pelvic ligaments, restlessness) and have a vet's number ready in case of difficulty.
Can I use this if I only know the breeding month?+
Enter your best estimate of the service date — the result shifts day-for-day with it. If the exact date is uncertain, treat the due date as approximate and rely on the birth window and a vet's pregnancy check for confirmation.
Does litter size change gestation?+
Slightly — in litter-bearing species like pigs, dogs and cats, larger litters can be born a touch earlier and small litters a touch later, which is part of why a window is given rather than a single date.
Is this a substitute for veterinary care?+
No — it's a planning and record-keeping aid. Always confirm pregnancy, monitor the animal's health, and seek veterinary help for pregnancy diagnosis, complications or a difficult birth.