📅 Calving & Gestation Date Calculator

Calculate expected due dates for cattle, sheep, goats, pigs, and horses from the breeding date. Includes gestation periods and days remaining.

Select species and enter breeding date to get gestation period, expected due date, and days remaining.

📊 Results

Gestation Period-

Expected Due Date-

Days Remaining-

🧮 Formula & How It Works

Due Date = Breeding Date + Gestation Period (days)

Gestation periods: Cow 283 days (range 279-287), Sheep/Goat 150 (144-155), Pig 114 (111-117), Horse 340 (320-370).

📊 Calculation Example

A cow bred June 1, 2026: Due = June 1 + 283 days = March 11, 2027. A pig bred the same day: Due = June 1 + 114 = September 23, 2026.

📖 How to Use This Calculator

1. Select species. 2. Enter breeding/AI date. Calculate. Use for planning calving seasons, vaccinations, and dry-off dates.

🌾 About This Tool

Gestation length varies within species. Actual parturition can occur 7-10 days before or after the calculated date. Use the due date as a planning guide, not an exact prediction.

⚠️ Common Mistakes & Tips

Using breeding date instead of conception date (AI vs natural). Forgetting gestation varies by breed and individual. Not accounting for twin pregnancies (often shorter).

✓ Expert Reviewed: This calculator and its content have been reviewed by agricultural experts. Formulas are based on standard extension service recommendations.

📚 References & Sources

FAO (Food and Agriculture Organization) — Agricultural production and nutrition guidelines
USDA NRCS — Field Office Technical Guide and conservation practice standards
Land-Grant University Cooperative Extension System — crop and livestock recommendations

❓ Frequently Asked Questions

Accurate gestation periods? ▼

Cow 283 days (9 months 10 days), ewe/doe 150 (5 months), sow 114 (3 months 3 weeks 3 days), mare 340 (11 months). These are averages — actual varies ±7-10 days.

How to use due date for management? ▼

Vaccinate dams 4-6 weeks before due date. Move to clean calving area 1-2 weeks before. Plan for increased observation around due date. Dry off dairy cows 60 days before.

Signs of approaching parturition? ▼

Udder development, vulvar swelling and relaxation, mucus discharge, nesting behavior, restlessness, pawing. In cows: pelvic ligament relaxation 24-48 hours before.