Bovine Gestation Calculator
Bovine gestation calculator works out Expected due date and Due date falls on from Breeding or service date, Gestation length override and Due window. The default figures on this page give expected due date of 2026-10-11; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Cattle (beef cow): published mean gestation of 283 days.
- 2026-01-01 + 283 days = 2026-10-11 (Sunday), the expected calving date.
- No published normal range is asserted for this species.
- On 2026-09-14 the animal is 256 days into gestation, 27 to go.
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
5 sources
What the bovine gestation calculator calculates
Calculates the expected calving, foaling, whelping, kidding or lambing date from a breeding or service date using published species gestation lengths, with the normal range where one has been published.
How to use this bovine gestation calculator
Enter Breeding or service date, Gestation length override, Due window and Today. Expected due date updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Expected due date, Due date falls on and What it is called.
The method follows Merck Veterinary Manual, The Reproductive System in Animals (gestation periods table), Merck Veterinary Manual, Pregnancy in Goats, Merck Veterinary Manual, Prolonged Gestation in Cattle and Sheep, Montana State University Extension, Beef Cattle Gestation Table and Kentucky Equine Research, Gestation in Mares: What Is Premature? What Is Overdue?.
What you can compare
Change one input at a time to see how it affects Expected due date, Due date falls on and What it is called. The inputs you can vary are Breeding or service date, Gestation length override, Due window and Today.
Understanding Expected due date, Due date falls on and What it is called
A planning estimate from published mean gestation lengths, not veterinary advice. Individual animals, breeds, litter size and sex of the offspring all shift the date; confirm pregnancy and timing with your veterinarian.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
Can you provide a gestation calculator for a cow?
Calculates the expected calving, foaling, whelping, kidding or lambing date from a breeding or service date using published species gestation lengths, with the normal range where one has been published. Put your own figures in above and the working updates beside the result. For scale, the default figures on this page give 2026-10-11.
How accurate is a cattle gestation table?
The bovine gestation calculator follows the stated method, but the result is only as reliable as Breeding or service date, Gestation length override, Due window and Today and the assumptions shown. Check the working and sources before relying on it for an important decision.
What is the typical gestation timeline for a cow?
On the figures this page opens with, the expected due date is 2026-10-11. No single number fits everyone: it follows Breeding or service date, Gestation length override and Due window, so enter your own above and the answer updates as you type.
What is the gestation calendar for Select Sires beef?
It needs Breeding or service date, Gestation length override, Due window and Today. Nothing else is required, and the figures stay in your browser.
What information do I need for the bovine gestation calculator?
You need Breeding or service date, Gestation length override, Due window and Today. The page opens with default figures that give expected due date of 2026-10-11, so you can see the scale before entering your own.
What does this bovine gestation calculator show?
It shows Expected due date, Due date falls on, What it is called, Gestation length used, Earliest expected, Latest expected, Shortest normal gestation and Longest normal gestation, with the working and any warnings for your entries.