Dog Due Date Calculator
Enter the breeding date to see when your dog is likely to whelp — plus the normal early-to-late window.
63 days on average
Canine gestation is about 63 days from breeding, with a normal range of 58–68.
An estimate
Breeding date is not conception date, so the window matters more than the single day.
How long are dogs pregnant?
About nine weeks, counted from breeding
Dogs are pregnant for roughly nine weeks. According to the American Kennel Club, canine gestation averages 63 days measured from the day of breeding, though a healthy litter can arrive anywhere from about day 58 to day 68. This calculator takes your breeding date and projects the most likely due date along with that normal early-to-late window, so you know when to have the whelping box ready and when to be on alert.
The calculation is simply the breeding date plus the gestation length, with a window around it.
due date = breeding date + 63 days (window: +58 to +68)Sixty-three days is the textbook average, but because the exact day of ovulation and fertilisation varies, vets describe a normal range rather than a fixed date. This calculator marks day 58 as the earliest typical whelping date, day 63 as the most likely, and day 68 as the latest. Puppies arriving inside that window are usually considered on time; a birth well before day 58 or after day 68 is a reason to call your veterinarian.
Say your dog was bred on 1 March.
Start from the breeding date
Begin at 1 March, the day of mating.Add the average gestation
1 March + 63 days lands around 3 May — the most likely due date.Mark the early edge
Day 58 is about 28 April, the earliest a healthy litter usually arrives.Mark the late edge
Day 68 is about 8 May; a birth after this is worth a vet call.
The single biggest source of variation is timing, which is why the window matters.
Sperm survives for days
Sperm can live in the reproductive tract for several days, so fertilisation may happen well after mating.
Ovulation varies
A bitch may ovulate before or after the mating, shifting the true conception date by days.
Litter size plays a role
According to veterinary guidance, large litters sometimes arrive a little early and small litters a little late.
Because of this, a date counted from breeding is an estimate, not a guarantee. The most accurate due dates come from ovulation timing measured by progesterone testing, or from an ultrasound and the gestational ageing a vet can do. If you want to count exact days between two dates yourself, our days between dates calculator does that, and our days until calculator counts down to the big day.
Use the window, not just the single due date, to plan. In the last week before day 58, set up a quiet, warm whelping area and let your dog get used to it. Many owners take the bitch's temperature twice daily in the final week: a drop below about 37.8 °C (100 °F) often signals labour within 24 hours. The earliest and latest dates from this calculator tell you when to start watching closely and when a delay becomes a concern. Keep your vet's number to hand throughout the window, and have a plan for an after-hours emergency in case labour stalls or starts early.
The dates are a guide; your vet is the authority.
Confirm with your veterinarian
This calculator estimates a due date from the breeding date using the average 63-day gestation and a 58–68 day window. It cannot account for the exact ovulation timing, breed differences, litter size, or your dog's individual history, so treat it as a planning guide rather than a precise prediction. It is not veterinary advice. For an accurate due date and a healthy pregnancy, work with your veterinarian, who can confirm the pregnancy and timing with progesterone testing, ultrasound, or X-ray, and guide you through whelping.