Pig gestation calculator
Type the date she was bred: the farrowing date, the likely window and what to do before.
Pigs carry about 114 days — just under 4 months. Most have their piglets between day 110 and day 117 after breeding.
Date bred
The day she was with the boar.
Pick the date she was bred to see her due date.
Example: a sow bred on September 1 is due about December 24 — most likely between December 20 and December 27.
What to do and when
Day 21
Watch for her next heat
A sow that did not settle comes back into heat about 21 days later.
Day 30
Pregnancy check
Your vet can tell if she is pregnant about 30 days after breeding.
10 days before she is due
Move her to the farrowing pen
Up to 10 days before she is due.
Day 118
Past her normal window
If she shows no signs of farrowing, call your vet.
A common guide — your vet’s plan wins.
Questions
How long are pigs pregnant?
Pigs carry about 114 days — just under 4 months. Most have their piglets between day 110 and day 117 after breeding.
How do I work out a pig’s due date?
Add 114 days to the day she was bred. Example: a sow bred on September 1 is due about December 24 — most likely between December 20 and December 27.
Why a window and not one day?
No two pigs are the same. Most give birth between day 110 and day 117, so start watching her at the beginning of the window. Sows with small litters tend to farrow a little early; very big litters a little late.
What if she was with the boar for weeks?
Enter the first and the last day they were together. The window then runs from the first day plus 110 days to the last day plus 117 days.
How do I know if she took?
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.
Sources
Last checked September 30, 2026. A common guide — your vet’s plan wins.
More calculators
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.