Dogs • pregnancyVerified Scientific Formula
Dog Pregnancy & Whelping Due Date Calculator
Computes estimated whelping due date and week-by-week developmental milestones for pregnant female dogs.
Enter Parameters
Calculated Output
Estimated Time to Whelping Due Date
33Days Remaining48% Gestation Completed
What This Result Means
Currently on Day 30 of ~63 (Second Trimester (Embryonic Organogenesis & Heartbeat Detection)). Veterinary ultrasound confirmation recommended between Days 25-35.
Calculation Details & Practical Equivalents
Gestation Progress
48%
Developmental Stage
Second Trimester (Embryonic Organogenesis & Heartbeat Detection)
Days Completed
30 days
Expected Due Date Window
Days 58 – 68
Formula & Mathematical Methodology
Standard Mathematical Formula
Canine Gestation = 63 Days from Ovulation / First Mating (Range: 58 to 68 days)
Formula Variables Defined
Mating DateDays Since Mating(days)
Elapsed days since breeding
Step-by-Step Calculation Example
Example: 63-Day Canine Gestation
Breeding date established on Day 0.
- Canine gestation average = 63 days
- At Day 30: Ultrasound confirmation window (Days 25-35)
- Estimated 33 days remaining until whelping
Final Output: Day 30 of 63 — Second Trimester
Key Assumptions
- Mating occurred close to ovulation date.
Biological Limitations
Verified Scientific & Veterinary Sources
Version: 1.0•Methodology Reviewed: 2026-01-15
1. The Merck Veterinary Manual (11th Edition)textbook
Aiello, S.E. and Moses, M.A. (Eds.) (2020). Merck & Co., Inc., Kenilworth, NJ
Access Source Authority Dog Pregnancy & Whelping Due Date Calculator — FAQs
Average canine gestation is 63 days (roughly 9 weeks), typically ranging from 58 to 68 days.