Pig Gestation Calculator

How to use the pig gestation calculator

1. 1. Choose what you know. Enter the breeding date to get a due date, or switch to the target due date mode to work backwards to the breeding date you need.
2. 2. Refine the inputs. The calculator uses the 114-day average for this species.
3. 3. Plan around the range. Use the earliest and latest dates and the milestone timeline to schedule checks, feed changes and preparation of the farrowing area.

How long is a pig's gestation period?

The average is 114 days from breeding to farrowing, about 3 months and 3 weeks. Anything between 112 and 116 days is normal, and a typical litter is 8-12 piglets. Treat the calculated date as the middle of that window rather than a fixed appointment.

Pig gestation table: breeding date to farrowing date

Breeding dates one week apart with the matching farrowing date at 114 days.

Working backwards from a target farrowing date

If you want piglets on the ground in a particular week, switch the calculator to target date mode and enter the date you are aiming for. It subtracts 114 days to give the breeding date to book, plus the earliest and latest service dates that still land inside your window.