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.
🚜 Farm Animals
Cattle & Cow
283 days average
(279–292 days)
Open CalculatorGoat
150 days average
(145–155 days)
Open CalculatorPig
114 days average
(112–116 days)
Open CalculatorSheep
147 days average
(142–152 days)
Open CalculatorHorse
340 days average
(320–370 days)
Open CalculatorLlama
350 days average
(330–365 days)
Open CalculatorDonkey
365 days average
(348–395 days)
Open CalculatorMare
340 days average
(320–370 days)
Open CalculatorAlpaca
340 days average
(335–345 days)
Open CalculatorBeef Cattle
283 days average
(279–292 days)
Open CalculatorPig (Farrowing)
114 days average
(112–116 days)
Open CalculatorGoat (Kidding)
150 days average
(145–155 days)
Open CalculatorSheep (Lambing)
147 days average
(144–152 days)
Open CalculatorHorse (Foaling)
340 days average
(320–370 days)
Open CalculatorCattle (Calving)
283 days average
(279–292 days)
Open CalculatorDairy Cattle
279 days average
(277–283 days)
Open CalculatorNigerian Dwarf Goat
149 days average
(145–153 days)
Open CalculatorBoer Goat
150 days average
(148–152 days)
Open CalculatorAngus Cattle
281 days average
(279–285 days)
Open CalculatorHereford Cattle
285 days average
(283–287 days)
Open CalculatorHolstein Cow
279 days average
(277–280 days)
Open CalculatorMiniature Horse
340 days average
(320–370 days)
Open CalculatorThoroughbred Horse
340 days average
(320–370 days)
Open CalculatorYorkshire Pig
114 days average
(112–115 days)
Open CalculatorMerino Sheep
147 days average
(145–152 days)
Open CalculatorSuffolk Sheep
147 days average
(144–150 days)
Open Calculator🐾 Pets
Dog
63 days average
(58–68 days)
Open CalculatorRabbit
31 days average
(28–34 days)
Open CalculatorCat
65 days average
(60–70 days)
Open CalculatorMice
20 days average
(19–21 days)
Open CalculatorGuinea Pig
65 days average
(59–72 days)
Open CalculatorHamster
16 days average
(15–18 days)
Open CalculatorFerret
42 days average
(41–42 days)
Open CalculatorDog (Whelping)
63 days average
(58–68 days)
Open CalculatorRabbit (Kindling)
31 days average
(28–35 days)
Open CalculatorChinchilla
111 days average
(105–115 days)
Open CalculatorRat
22 days average
(21–23 days)
Open CalculatorGerbil
25 days average
(24–26 days)
Open CalculatorHedgehog
35 days average
(34–37 days)
Open Calculator🐔 Poultry & Birds (Egg Incubation)
Chicken (Egg Incubation)
21 days average
(19–22 days)
Open CalculatorDuck (Egg Incubation)
28 days average
(27–28 days)
Open CalculatorGoose (Egg Incubation)
30 days average
(28–35 days)
Open CalculatorTurkey (Egg Incubation)
28 days average
(27–28 days)
Open CalculatorQuail (Egg Incubation)
17 days average
(16–23 days)
Open CalculatorPheasant
24 days average
(22–26 days)
Open CalculatorPeacock (Peafowl)
28 days average
(27–30 days)
Open CalculatorGuinea Fowl
27 days average
(26–28 days)
Open CalculatorEmu
53 days average
(50–56 days)
Open CalculatorOstrich
42 days average
(38–45 days)
Open CalculatorPigeon
18 days average
(17–19 days)
Open CalculatorDove
14 days average
(13–16 days)
Open CalculatorCockatiel
19 days average
(18–21 days)
Open CalculatorBudgerigar (Budgie)
18 days average
(17–20 days)
Open CalculatorLovebird
23 days average
(21–24 days)
Open CalculatorCanary
13 days average
(13–14 days)
Open CalculatorFinch
13 days average
(12–14 days)
Open Calculator🦌 Exotic & Wild Animals
Deer
201 days average
(195–210 days)
Open CalculatorElephant
645 days average
(617–668 days)
Open CalculatorGiraffe
457 days average
(453–464 days)
Open CalculatorBison
277 days average
(270–285 days)
Open CalculatorCamel
400 days average
(390–410 days)
Open CalculatorZebra
375 days average
(360–396 days)
Open Calculator🦁 Wild Animals
Wolf
63 days average
(62–63 days)
Open CalculatorLion
110 days average
(105–115 days)
Open CalculatorTiger
103 days average
(93–112 days)
Open CalculatorLeopard
96 days average
(90–105 days)
Open CalculatorCheetah
93 days average
(90–98 days)
Open CalculatorGorilla
257 days average
(250–265 days)
Open CalculatorChimpanzee
235 days average
(230–240 days)
Open CalculatorPolar Bear
240 days average
(195–265 days)
Open CalculatorBrown Bear
220 days average
(180–270 days)
Open CalculatorHippopotamus
240 days average
(225–257 days)
Open CalculatorRhinoceros
462 days average
(450–480 days)
Open CalculatorKangaroo
35 days average
(31–36 days)
Open CalculatorKoala
35 days average
(30–35 days)
Open CalculatorGiant Panda
135 days average
(95–160 days)
Open CalculatorReindeer
228 days average
(215–240 days)
Open CalculatorMoose
235 days average
(225–250 days)
Open CalculatorDolphin
365 days average
(300–520 days)
Open CalculatorWhale
365 days average
(300–520 days)
Open CalculatorBear (All Species)
220 days average
(95–270 days)
Open CalculatorOtter
65 days average
(60–270 days)
Open Calculator🐍 Reptiles
Ball Python
57 days average
(55–60 days)
Open CalculatorCorn Snake
60 days average
(55–65 days)
Open CalculatorLeopard Gecko
52 days average
(35–89 days)
Open CalculatorBearded Dragon
65 days average
(55–75 days)
Open CalculatorTortoise
75 days average
(60–180 days)
Open CalculatorRed-Eared Slider
75 days average
(59–90 days)
Open CalculatorChameleon
175 days average
(150–300 days)
Open CalculatorGreen Iguana
105 days average
(90–120 days)
Open CalculatorCrested Gecko
90 days average
(60–120 days)
Open CalculatorBlue Tongue Skink
100 days average
(100–105 days)
Open CalculatorKing Snake
55 days average
(45–65 days)
Open CalculatorBoa Constrictor
110 days average
(100–120 days)
Open CalculatorMonitor Lizard
165 days average
(150–180 days)
Open CalculatorPython (All Species)
70 days average
(50–90 days)
Open CalculatorGecko (All Species)
65 days average
(35–120 days)
Open Calculator🐠 Fish & Aquatic
Guppy
26 days average
(21–30 days)
Open CalculatorMolly Fish
60 days average
(45–70 days)
Open CalculatorPlaty Fish
28 days average
(24–35 days)
Open CalculatorSwordtail Fish
28 days average
(28–40 days)
Open CalculatorBetta Fish
3 days average
(1–5 days)
Open CalculatorGoldfish
5 days average
(4–7 days)
Open CalculatorAngelfish
2 days average
(2–3 days)
Open CalculatorDiscus Fish
2 days average
(2–3 days)
Open CalculatorKoi Fish
4 days average
(3–5 days)
Open CalculatorEndler Guppy
23 days average
(22–24 days)
Open CalculatorCherry Shrimp
30 days average
(21–35 days)
Open CalculatorTilapia
14 days average
(9–18 days)
Open Calculator🐸 Amphibians
📋 Breeding Tools
Dog Heat Cycle
Predict your dog's next heat
Open CalculatorCat Heat Cycle
Predict your cat's next heat
Open CalculatorCattle Breeding
Plan your calving season
Open CalculatorSheep Breeding
Plan your lambing season
Open CalculatorGoat Breeding
Plan your kidding season
Open CalculatorDeer Rut Dates
Peak rut dates by state
Open CalculatorAnimal Age Calculator
Convert to human years
Open CalculatorPuppy Weight Calculator
Predict adult dog size
Open CalculatorKitten Growth Calculator
Predict adult cat size
Open CalculatorLivestock Due Date Calendar
Plan your breeding season
Open CalculatorEgg Fertility Calculator
Candling schedule by species
Open CalculatorThat's 114+ calculators across every category — browse the complete, alphabetized directory.
View All Calculators →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. See the full gestation periods reference chart for a side-by-side comparison across every species, or the complete calculator directory to browse by category.
Latest from the Blog
View all posts →Goat Pregnancy Week by Week: Timeline & Chart
The full 150-day goat pregnancy timeline: what happens at each stage, feeding changes, and when kidding watch starts (day 135).
September 27, 2026
Cattle Pregnancy Week by Week: 283-Day Chart
The 283-day cattle pregnancy chart by trimester and week: testing dates, feeding changes, and the calving watch from day 270.
September 27, 2026
Horse Pregnancy Month by Month: 340-Day Guide
The 11-month mare pregnancy timeline: ultrasound dates, udder development from day 300, night checks from day 320.
September 27, 2026
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.
Popular Gestation Guides
Deer Gestation Period
201 days for whitetail — species chart in days, weeks and months.
Read guide →
Cattle Gestation Period
283 days, breed-by-breed differences, and the calving window explained.
Read guide →
Dog Pregnancy Week by Week
The complete 9-week timeline — signs, development and vet visits.
Read guide →
Donkey Gestation Period
365 days, the longest gestation of any common farm animal.
Read guide →
Frequently Asked Questions
What is a gestation calculator?
A gestation calculator helps farmers, ranchers, and pet owners determine the expected due date of a pregnant animal by adding the species' average gestation period to the breeding date. Simply enter the date of mating or artificial insemination and the calculator returns the expected birth date along with key pregnancy milestones.
Which animals does GestationCalc support?
GestationCalc offers 120+ dedicated calculators covering farm animals (cattle, goats, pigs, sheep, horses), companion pets (dogs, cats, rabbits, hamsters), poultry and birds, reptiles, fish, and wildlife. Browse the full directory on our All Calculators page or see every species at a glance on our Gestation Periods chart.
How accurate are these gestation calculators?
These calculators use scientifically validated average gestation periods sourced from USDA data, Penn State Extension, and the Merck Veterinary Manual. Because individual animals vary, the calculators also show the normal range (earliest to latest expected date) so you can plan accordingly.
Are these calculators free to use?
Yes. All calculators on GestationCalc are completely free to use with no account or signup required. Results are calculated entirely in your browser.
Can I use a gestation calculator for breeds with different gestation lengths?
Yes. Each calculator includes a breed-specific dropdown. For example, the cattle calculator lets you select Angus, Hereford, Holstein, Brahman, or Simmental — each with its own average gestation length.
Have more questions? Contact us or browse the blog for in-depth guides.