Free tool · 02 Mating to Birth
Dog Due Date Calculator
Work out when your dog is due from her ovulation, LH surge, progesterone or mating dates, and get a week-by-week plan you can print or add to your calendar.
- Uses the same figures as our referenced articles
- Shows the whole window, not just one day
- No email, nothing stored on our side
Step 1
What do you know?
Pick the most precise date you have. Hormone-timed dates give a much narrower window.
Step 2
Your result
Enter a date to see her due window
The result updates as you type. Everything is calculated in your browser.
Estimated due date
Your plan
Call your vet if her temperature drops below 99°F (37.2°C) and labor has not started within 24 hours, or if she reaches the end of her window with no signs of labor. Our whelping checklist article lists every sign that needs a call.
From thebreedercollective.com/dog-due-date-calculator · An estimate to plan around. Your vet’s assessment comes first.
How the estimate is worked outPregnancy lasts about 63 days from ovulation (62–64), about 65 days from the LH surge (64–66) and 64–66 days from the first rise in progesterone. Counted from the first accepted mating alone, normal whelping can fall anywhere from about 58 to 72 days later, because sperm can survive for days before she ovulates. An ultrasound measurement at around four weeks can narrow a mating-based estimate. Read the full explanation in Calculating the due date.
Calculating the due dateWhy ovulation timing beats the mating date, with sources.Read the article →
Whelping preparation checklistFree printable list of everything to have ready.Get the checklist →
Confirming the pregnancyUltrasound, X-ray and what each one tells you.Read the article →
This calculator gives an estimate to plan around. It is general information, not veterinary advice, and it does not replace your vet’s assessment of your dog.