Handy tools
Livestock due date calculator
Enter the mating or joining date to see when calving, lambing, kidding, farrowing or foaling is due - and add it to your phone's calendar.
Calving due about
Sun, 18 July 2027 in 40 weeks
Average of 283 days for cows and heifers.
- Mated / joined
- Thu, 8 Oct 2026
- Watch from
- Wed, 14 July 2027
- Average due date
- Sun, 18 July 2027
- Usual range ends
- Sun, 25 July 2027
Average gestation lengths
| Animal | Birth is called | Average | Usual range |
|---|---|---|---|
| Cattle (cows and heifers) | Calving | 283 days | 279–290 days |
| Sheep (ewes) | Lambing | 147 days | 142–152 days |
| Goats (does) | Kidding | 150 days | 145–155 days |
| Pigs (sows and gilts) | Farrowing | 114 days | 111–117 days |
| Horses (mares) | Foaling | 340 days | 320–365 days |
These are general averages. Breed, age, season, twins and litter size all move the real date, so keep an eye on your animals from the “watch from” date and ask your vet about anything unusual. The calculator runs in your browser; the calendar file is made from the dates only and nothing is stored. Words like joining, weaner or heifer explained in the farm words glossary.
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