Estimated calving date
Enter a breeding or insemination date
Cow
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Planning window starts—
Estimated date—
Planning window ends—
This is a planning estimate, not a pregnancy diagnosis or a guaranteed calving date.
Free calving-date planner
Cow and buffalo pregnancy calculator
Enter a breeding or artificial insemination date to estimate the calving date and planning window. The cow and bhains assumptions are separate, visible and editable.
- Cow and buffalo reference values
- Editable gestation assumption
- Estimated date and planning window
Free planning tool
Estimate the calving date
Start with the breeding or artificial insemination date. Change the animal details only when needed.
Your entries stay in this browser and are not sent to DairyTrack.
How the estimate works
A planning date, not a guarantee
The calculator adds the selected gestation length to the recorded breeding or artificial insemination date. It starts with 283 days for a cow and 310 days for a buffalo, while keeping the assumption editable because breed, calf sex and the individual animal can affect the actual gestation length.
The planning window uses published species ranges and shifts when you change the central assumption. If the service date is uncertain, or the animal's condition concerns you, use a veterinarian's assessment rather than relying on this date calculation.
Reference assumptions
Why cow and buffalo dates differ
For cattle, the University of Nebraska–Lincoln notes a common 283-day gestation and a 279–287 day range. For buffalo under subtropical management, ICAR's Central Coastal Agricultural Research Institute lists 310 days with a 305–330 day range. These are population-level references, not a prediction for one animal.
From estimate to record
Keep the date with the animal
A one-off estimate is easy to lose in a chat or notebook. DairyTrack keeps breeding, pregnancy and expected-delivery dates with the animal's other farm records, so the plan is available when the team needs it.
Common questions
Using the calving-date estimate
Can I use the date as proof of pregnancy?
No. The calculator only adds days to a date. It cannot confirm pregnancy or assess the animal.
What if I use a different breed assumption?
Edit the gestation length in days. The estimated date and planning window will move together.
Why is the buffalo window wider?
The referenced buffalo range is wider than the cattle range, so the tool shows that uncertainty instead of hiding it.
Does DairyTrack receive my entries?
No. The animal ID and date remain on the current page in your browser.