Gestation calculators for the farm
Due dates, calving and lambing windows, the date to put the bull in, and printable charts for every common farm animal. Free, sourced, and no account.
Due to calve
FEB 08
Example: cow bred May 1, 2026
283 days
283 days
Quick cow calving date
Cattle due date calculator
Pick a date to see the due date.
Breeding season plannerWhole herd, bull in → out windows, 21-day calving periods, print and calendar export.Printable cattle gestation chartEvery breeding date of the year, 283 days or your breed.Heat cycle calculatorWhen she should come back into heat if she did not settle.
Gestation lengths at a glance
| Animal | Average gestation | Range |
|---|---|---|
| Cattle | 283 days | 253 to 300 days |
| Sheep | 147 days | 144 to 152 days |
| Goat | 150 days | 144 to 155 days |
| Horse | 340 days | 320 to 370 days |
| Pig | 114 days | — |
| Rabbit | 31 days | 28 to 35 days |
| Alpaca & Llama | 346 days | 339 to 353 days |
| Dog | 63 days | 58 to 72 days |
Cattle range is the shortest and longest recorded in a 2024 study; alpaca range is the middle half of 7,049 pregnancies. See methodology and sources.