Cow Gestation Calculator
Calculate a cow calving date and due window
Enter a breeding, AI, or exposure date to estimate a cow or heifer's calving date, practical calving window, dry-off date, and herd prep reminders.
Choose a breeding date to see the calving calendar.
How to use this cattle due date calculator
Use the date the cow or heifer was bred, artificially inseminated, or first exposed to a bull. The calculator adds the selected gestation length and gives you an estimated calving date plus an early-to-late window.
For general planning, 283 days is the standard cattle gestation estimate. Actual calving can shift by breed, calf sex, cow age, nutrition, and individual history, so the window is often more useful than the single center date.
Quick calving preparation checklist
- Mark the early edge of the calving window, not only the center due date.
- Move close-up cows or heifers where they can be checked easily before the first expected date.
- Prepare clean bedding, tags, iodine or navel dip, colostrum supplies, calf puller access, and a working light.
- Keep records of actual calving dates so future custom gestation settings match your herd.
Cow gestation FAQ
What is the average cow gestation length?
Most cattle due date charts use about 283 days from breeding to calving. Some cows calve earlier or later, so this calculator shows a planning range around the estimated date.
What date will a cow calve if bred today?
With the standard 283-day setting, the estimated calving date is 283 days after today's breeding date. Use the date input above to calculate the exact calendar date and prep window.
Can I use this for heifers?
Yes. Enter the heifer's breeding or AI date just as you would for a mature cow. Heifers may need closer observation near calving, especially if they are first-calf animals.
Is this a veterinary tool?
No. It is a planning calculator for farm calendars. For pregnancy concerns, difficult labor, nutrition issues, or health questions, work with your veterinarian or qualified cattle professional.