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 CalculatorGoat
150 days average
(145–155 days)
Open CalculatorDog
63 days average
(58–68 days)
Open CalculatorPig
114 days average
(112–116 days)
Open CalculatorRabbit
31 days average
(28–34 days)
Open CalculatorSheep
147 days average
(142–152 days)
Open CalculatorHorse
336 days average
(320–362 days)
Open CalculatorLlama
350 days average
(330–365 days)
Open CalculatorDonkey
365 days average
(348–395 days)
Open CalculatorCat
65 days average
(60–70 days)
Open CalculatorDeer
201 days average
(195–210 days)
Open CalculatorElephant
645 days average
(617–668 days)
Open CalculatorGiraffe
457 days average
(453–464 days)
Open CalculatorMare
340 days average
(320–370 days)
Open CalculatorMice
20 days average
(19–21 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 → |
| 🦌 Deer | 201 | 195–210 | ~6.6 mo | Open → |
| 🐘 Elephant | 645 | 617–668 | ~21.2 mo | Open → |
| 🦒 Giraffe | 457 | 453–464 | ~15.0 mo | Open → |
| 🐎 Mare | 340 | 320–370 | ~11.2 mo | Open → |
| 🐭 Mice | 20 | 19–21 | ~0.7 mo | Open → |
View the complete gestation periods reference chart including sheep, horses, rabbits, and more.
Latest from the Blog
View all posts →Cat Gestation Period: Complete Guide
Complete guide to cat gestation — average pregnancy length (65 days), breed differences, kittening signs, and how to prepare.
February 5, 2025
Donkey Gestation Period: Complete Guide
Complete guide to donkey gestation — average pregnancy length (365 days), the longest-gestating common farm animal.
February 1, 2025
How Long Are Llamas Pregnant?
Complete guide to llama gestation — average pregnancy length (350 days), cria care, and daytime birth preference.
January 28, 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.