About GestationCalc

GestationCalc is a free resource built for farmers, ranchers, livestock producers, and pet breeders who need fast, accurate animal gestation calculators. Enter a breeding date — get the expected due date, gestation timeline, and key milestones in seconds. No account, no signup, no cost.

Our Mission

We believe that accurate, science-based animal reproduction information should be freely accessible to everyone — from large-scale commercial operations to backyard hobby farms. Our calculators are built on peer-reviewed research and continuously reviewed by animal husbandry specialists.

Our Editorial Team

GestationCalc content is developed and reviewed by a team with backgrounds in:

• Animal husbandry and livestock production — beef and dairy cattle, sheep, goats, and swine
• Veterinary medicine consultation — large animal and small animal practitioners
• Agricultural extension — drawing on methods from Penn State Extension and University of Minnesota Extension
• Canine reproduction — breeding program management and whelping support

All calculator data and content is reviewed against primary sources including USDA production statistics, university extension publications, breed association data, and the Merck Veterinary Manual.

Our Data Sources

We rely exclusively on validated, peer-reviewed data sources:

• USDA National Agricultural Statistics Service — national livestock production data
• Penn State Extension — livestock reproduction and management guides
• University of Minnesota Extension — animal production and health resources
• Merck Veterinary Manual — veterinary reproduction reference
• Breed association registries (American Angus Association, Holstein Association USA, American Kennel Club, etc.)

Our Calculators

We currently offer free gestation calculators for:

Editorial Standards

All content on GestationCalc is reviewed by subject-matter experts before publication and periodically updated to reflect current research. We do not publish content that conflicts with established veterinary and agricultural science. If you believe any information is inaccurate, please contact us and we will review it promptly.

Disclaimer

GestationCalc provides general information for educational purposes. Due dates generated by our calculators are estimates based on average gestation periods. Always consult a licensed veterinarian for medical advice specific to your animal.