Pig pregnancy guide
How long is a pig pregnant?
A pig is pregnant for about 114 days (about 3.7 months). The normal range is 111 to 117 days, so most piglets arrive within that window rather than on the exact average day.
Quick rule: Count about 3.5 months forward from the breeding date, then adjust for breed.
How to use the pig pregnancy calculator
1. Enter the breeding date. The first day she was served or inseminated. Tap Use today if it was today.
Then follow the schedule. Each task gets a real date, the next one is highlighted, the status shows whether your sow is on track, and the month by month cards above show where things stand. Use Copy schedule or Add to Google Calendar to keep it.
Gestation formulas
- Estimated farrowing date = breeding date + 114 days
- Earliest normal farrowing = breeding date + 111 days
- Latest normal farrowing = breeding date + 117 days
- Breed adjustment = breed average minus 114 days, applied to the whole window
- Call your vet if nothing has happened by day 118
Care schedule for a pregnant sow
| When | Task | Why |
|---|---|---|
| Day 21 | Watch for return to heat | No heat around days 18 to 24 suggests she is pregnant. |
| Day 30 | Pregnancy check | Ultrasound scan from about day 25 to 35. |
| 21 days before due date | Pre-farrowing vaccines | E. coli and clostridial vaccines about 2 to 5 weeks before farrowing. |
| 14 days before due date | Deworm | Deworm about two weeks before farrowing, as your vet advises. |
| 7 days before due date | Move to farrowing pen | Wash her and move her 5 to 7 days before farrowing. |
Signs of farrowing and when to call the vet
Labour is close if she has
- ✓Nest building with straw or bedding
- ✓Milk can be squeezed from the teats (within 12 to 24 hours)
- ✓Restless, lying down and getting up
- ✓Fast breathing and clear discharge
Call your vet immediately if
- !Strong straining for 30 minutes with no piglet born
- !A baby is visible but stuck, or comes backwards with no progress
- !Heavy bleeding or foul-smelling discharge
- !She is weak, collapsed, off her food or in obvious pain
- !No farrowing by day 118
Frequently asked questions
How long is a pig pregnant?
A pig is pregnant for about 114 days (about 3.7 months). Most piglets arrive between day 111 and day 117.
How accurate is this calculator?
It uses the average length and the normal range published in veterinary references, adjusted for the breed you pick. Individual animals vary, so treat the date as the middle of a window, not a promise.
When can I confirm the pregnancy?
Pregnancy check around day 30. Ultrasound scan from about day 25 to 35.
What if she goes past the due date?
Going a few days past the average is normal. The calculator marks day 117 as the end of the usual window and day 118 as the point to call your vet even if she seems well.
What are the signs that farrowing is close?
Nest building with straw or bedding. Milk can be squeezed from the teats (within 12 to 24 hours). Restless, lying down and getting up.
Is my data saved?
No. Everything is calculated in your browser. Nothing you type is stored or sent anywhere.
Disclaimer: This calculator gives estimates for planning only. It is not veterinary advice and cannot replace an examination by your vet. If you are worried at any stage, especially around birth, contact your vet promptly.
