Equine Gestation and Due Date Calculator

Foaling Window Planner and Breeding Milestone Tracker

Breeding Details and Setup

Configure cover date and custom gestation length to update timeline

Standard Gestation Average 340 Days
Average Target Gestation Length 340 Days
320 Days (Early Threshold) 340 Days (Average) 365 Days (Upper Range)
Early Watch Window
---
Day 320 (Premature threshold)
Expected Due Date
---
Target 340 Days Average
Upper Limit Window
---
Day 365 (Extended gestation)

Current Gestation Progress

Calculating Stage
Day 0 of Gestation 0%
Trimester 1 (Day 1 - 114) Trimester 2 (Day 115 - 226) Trimester 3 (Day 227 - 340+)

Days Remaining Countdown

To 340 Day Target
--
Days Until Expected Due Date
Emergency Vet Contact Reminder

Ensure your attending veterinarian is notified when mare reaches Day 310 or shows early waxing signs.

Key Developmental and Veterinary Milestones

Critical ultrasound windows, EHV-1 vaccination schedule, and prep milestones

Automatically Computed Dates

Signs of Impending Foaling Checklist

Observe and check off daily physical changes as due date approaches

Milk Calcium and pH Test Helper

Reference guide for testing mammary secretions

Calcium Strip Reading

Calcium carbonate concentration exceeding 200 ppm indicates an 84% probability of foaling within 48 hours and 98% within 72 hours.

pH Level Drop

Mammary fluid pH typically drops from above 7.0 down to 6.4 or lower within 24 to 48 hours prior to partum.

Testing Protocol Tip

Begin testing milk secretions daily at Day 320 or when udder distension becomes prominent. Test at the same time every evening.

Essential Foaling Kit and Barn Preparation Checklist

Ensure all vital equipment and emergency supplies are clean and ready

Printable Mare Foaling Watch Sheet

Formatted schedule and record card for barn stall door or veterinary folder

Bella

Bred to Royal Legacy | Service Date October 1, 2026

Official Foaling Watch Document
Target Due Date (340 Days) ---
Early Watch Window (Day 320) ---
Mare Status and Notes Experienced Mare
Target DateGestation StageMilestone Action or Requirement
Special Instructions and Notes No additional notes provided
Generated via Equine Gestation and Due Date Calculator Keep copy posted at foaling stall door