Cow gestation calculator

Pick the date she was bred to see her due date.

A common guide — your vet’s plan wins.

Cattle carry about 283 days — about 9 months. Most have their calves between day 279 and day 287 after breeding.

Add 283 days to the day she was bred. Example: a cow bred on June 1 is due about March 11 — most likely between March 7 and March 15.

No two cattle are the same. Most give birth between day 279 and day 287, so start watching her at the beginning of the window. Cows carrying bull calves tend to carry a little longer than cows carrying heifers.

Enter the first and the last day they were together. The window then runs from the first day plus 279 days to the last day plus 287 days.

Watch for her next heat about 21 days after breeding. If she does not come back into heat, she has probably settled — your vet can confirm it.

A little: Holstein cows average 279 days and Brahman cows 292. Pick her breed above and the date moves with it.

Many printed 283-day tables count the breeding day as day 1, so a cow bred on January 1 shows October 10. Counting 283 days from the breeding day gives October 11. Both are inside her window.

Last checked September 30, 2026. A common guide — your vet’s plan wins.

Remembers every animal’s due date and reminds you before each job — the pregnancy check, the pen, the watch. Coming to the App Store this winter.