How long is pig gestation?

Pig gestation is commonly estimated at 114 days from breeding, often remembered as 3 months, 3 weeks, and 3 days. Individual sows and gilts can farrow a few days earlier or later.

How do I calculate a sow farrowing date?

Enter the breeding date and add the gestation length you want to use. This calculator uses 114 days by default and shows an early-to-late farrowing window around the estimated due date.

Can a pig farrow before 114 days?

Yes. The due date is an estimate, not a guarantee. Many producers watch the sow or gilt closely before the calculated date, especially if breeding dates are uncertain or the animal has a history of early farrowing.

Is the due date different for gilts and sows?

The common planning number is still about 114 days, but individual animals vary. Use your own herd records or veterinary guidance if your gilts or sows consistently farrow earlier or later.

Pig Gestation Calculator

Calculate a sow farrowing date and due window

Enter the breeding date for a sow, gilt, or group to estimate the farrowing due date, likely farrowing window, and practical prep dates for your barn calendar.

Estimated farrowing date — Based on 114 days

Breeding date Planning type

Custom gestation length (days) Number of bred females

Expected piglets per litter Farrowing window to show

Likely farrowing window—

Estimated piglet crop—

Move to close watch—

Prep farrowing area by—

Choose a breeding date to see the farrowing calendar.

How to use this pig due date calculator

Use the date the sow or gilt was bred, exposed, or artificially inseminated. The calculator adds the selected pig gestation length and gives you an estimated farrowing date plus an early-to-late window.

For general planning, 114 days is the common pig gestation estimate. It is often remembered as 3 months, 3 weeks, and 3 days. If your herd records point to a different average, choose the custom option and enter your own number of days.

Quick farrowing preparation checklist

Mark the early edge of the farrowing window, not only the center due date.
Prepare clean bedding, heat lamps or safe warming areas, iodine or navel care, towels, and feeding supplies.
Move the sow or gilt into the prepared farrowing area early enough for her to settle.
Keep notes on actual farrowing dates so next season's custom gestation setting reflects your own herd.

Pig gestation FAQ

What is the average pig gestation length?

Most pig due date charts use 114 days from breeding. A normal farrowing window can vary by a few days, so this calculator shows a planning range instead of treating the exact day as guaranteed.

What is the pig gestation rule of thumb?

The common rule is 3 months, 3 weeks, and 3 days, which is about 114 days. Enter the breeding date above to turn that rule into exact calendar dates.

What is the due date for a sow bred today?

With the standard 114-day setting, the estimated farrowing date is 114 days after today's breeding date. Use the date input above to calculate the exact date and prep window.

Is this a veterinary tool?

No. It is a planning calculator for farm calendars. For pregnancy concerns, difficult labor, weak piglets, nutrition questions, or health issues, talk with a veterinarian or qualified swine professional.

Calculate a sow farrowing date and due window

How to use this pig due date calculator

Quick farrowing preparation checklist

Pig gestation FAQ

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