Animal Gestation Calculators
Enter a breeding date — get the exact expected due date, gestation timeline, and key milestones. Free tool, no signup required.
Choose Your Animal ↓Our Calculators
Select an animal to open the full calculator with breed-specific options, milestones, and progress tracking.
Cattle & Cow
283 days average
(279–292 days)
Open Calculator🐐Goat
150 days average
(145–155 days)
Open Calculator🐕Dog
63 days average
(58–68 days)
Open Calculator🐷Pig
114 days average
(112–116 days)
Open Calculator🐇Rabbit
31 days average
(28–34 days)
Open Calculator🐑Sheep
147 days average
(142–152 days)
Open Calculator🐴Horse
336 days average
(320–362 days)
Open Calculator🦙Llama
350 days average
(330–365 days)
Open Calculator🫏Donkey
365 days average
(348–395 days)
Open Calculator🐱Cat
65 days average
(60–70 days)
Open CalculatorLooking for sheep, horses, or rabbits? View the full gestation periods reference chart →
What Is a Gestation Calculator?
A gestation calculator is a tool that calculates an animal's expected due date by adding the species-specific average gestation period to the breeding (or mating) date. Whether you're a cattle rancher planning for calving season, a goat farmer preparing kidding supplies, or a dog breeder anticipating a litter, knowing the expected due date helps you ensure the health of both mother and offspring.
GestationCalc uses scientifically validated gestation data from USDA research, university extension programs, and the Merck Veterinary Manual. Each calculator displays the average due date, the normal range (earliest to latest), key developmental milestones, and a visual pregnancy progress bar — all in seconds.
Gestation Periods Quick Reference
View full chart →| Animal | Avg Days | Range | Months | Calculator |
|---|---|---|---|---|
| 🐄 Cattle & Cow | 283 | 279–292 | ~9.3 mo | Open → |
| 🐐 Goat | 150 | 145–155 | ~4.9 mo | Open → |
| 🐕 Dog | 63 | 58–68 | ~2.1 mo | Open → |
| 🐷 Pig | 114 | 112–116 | ~3.8 mo | Open → |
| 🐇 Rabbit | 31 | 28–34 | ~1.0 mo | Open → |
| 🐑 Sheep | 147 | 142–152 | ~4.8 mo | Open → |
| 🐴 Horse | 336 | 320–362 | ~11.1 mo | Open → |
| 🦙 Llama | 350 | 330–365 | ~11.5 mo | Open → |
| 🫏 Donkey | 365 | 348–395 | ~12.0 mo | Open → |
| 🐱 Cat | 65 | 60–70 | ~2.1 mo | Open → |
View the complete gestation periods reference chart including sheep, horses, rabbits, and more.
Latest from the Blog
View all posts →Cattle Gestation Period: Complete Guide
Everything you need to know about cattle and cow pregnancy — average days, breed differences, trimester breakdown, and signs of approaching calving.
January 1, 2025
How Long Are Goats Pregnant?
A complete guide to goat gestation — average pregnancy length by breed, kidding signs, and how to prepare for a successful kidding season.
January 5, 2025
Dog Pregnancy Timeline Week by Week
A week-by-week breakdown of dog gestation from conception to whelping — what to expect at each stage and how to prepare.
January 15, 2025
Why Trust GestationCalc?
Science-Based Data
Gestation data sourced from USDA research, Penn State Extension, University of Minnesota Extension, and the Merck Veterinary Manual.
Expert-Reviewed Content
All content reviewed by animal husbandry specialists and veterinary consultants with real-world livestock and companion animal experience.
Free & Private
No account, no email, no data collection beyond anonymous analytics. Calculations happen entirely in your browser.