What species does this calculator support?

The calculator covers 10 species: cattle (cow), horse, pig (sow), sheep (ewe), goat (doe), rabbit (doe), dog, cat, donkey, and llama/alpaca.

How accurate is the expected due date?

The expected due date uses the average gestation length for each species. Actual delivery can occur anywhere within the early-to-late range shown, and individual variation is normal. Always consult a veterinarian for medical decisions.

What is the pig gestation rule of thumb?

Pig gestation is commonly remembered as "3 months, 3 weeks, and 3 days," which equals approximately 114 days.

Can I use a conception date instead of a breeding date?

Yes. For most livestock, the breeding date and conception date are very close together. Simply enter whichever date you have recorded.

Does this tool store any data?

No data is sent to any server. All calculations happen in your browser. Nothing is stored or transmitted.

Gestation Calculator for Livestock

Select an animal species and enter a breeding date to calculate the expected due date, plus early and late possible dates.

Calculate Due Date

Select a species and enter the breeding date.

Animal Species

Breeding / Conception Date

Select a species and enter a breeding date to see results.

Livestock Gestation Periods Reference

Species	Average (days)	Range (days)	Notes

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Summary

This livestock gestation calculator helps farmers and breeders estimate expected due dates for 10 common species. Enter the breeding or conception date, select the species, and instantly see the average due date alongside the earliest and latest possible dates based on typical gestation ranges.

How it works

Select the livestock species from the dropdown.
Enter the breeding or conception date using the date picker.
The calculator adds the average gestation period to produce an expected due date.
Early and late possible dates are computed from the minimum and maximum gestation ranges.
A reference table below the calculator shows gestation ranges for all 10 species.

Use cases

Plan calving, foaling, or farrowing schedules on a livestock farm.
Prepare birthing supplies and veterinary checkups ahead of the due date.
Track multiple animals across different breeding dates.
Quickly verify expected due dates for goats, sheep, rabbits, and other livestock.

Frequently Asked Questions

Last updated: 2026-05-29 · Reviewed by Nham Vu