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COW Gestation Calculator
Use this cattle gestation calculator to estimate a cow or heifer’s calving date from a service date, or work backward from a due date to estimate the breeding date. Standard cattle gestation is calculated at 283 days.
Calculate Calving Date
Service Date mode adds 283 days to the date bred to estimate the expected calving date.
Use the calendar picker to select the breeding date or known due date.
Estimated Calving Date
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Service Date --
Gestation Length 283 Days
Early Calving Watch --
Likely Calving Window --
Select a date to calculate. Actual calving dates can vary by cow, breed, bull, sex of calf, nutrition, age, and herd conditions.
Need Bred Cows or Bred Heifers?
After you know the calving window, use ConneXion to compare bred cattle opportunities, monitor market reports, and find cattle that fit your calving season.
How the Cattle Gestation Calculator Works
The average cattle gestation period is commonly estimated at 283 days. This calculator can be used two ways: enter the service date to project the expected calving date, or enter a known due date to estimate the likely breeding date. It is designed for cow-calf producers, cattle brokers, ranch managers, and buyers evaluating bred cows or bred heifers.
- Service Date: adds 283 days to estimate the calving date.
- Due Date: subtracts 283 days to estimate the service date.
- Calving Window: shows an estimated range around the target date for practical herd planning.