When are the puppies due? Calculate from the ovulation date, LH surge, or breeding date — with the full pregnancy timeline from ultrasound to the temperature drop.
Pick the date you know — ovulation gives the tightest prediction — and we'll map the due date plus the ultrasound, X-ray, and temperature-watch windows.
Canine gestation is one of the most predictable in veterinary medicine when timed from ovulation. The famous “57 to 72 days” range isn't biological variation — it's measurement error, because sperm can wait up to a week for ovulation after a breeding.
The gold standard. If your repro vet ran progesterone timing, your due date is accurate to about a weekend.
Nearly as precise — whelping reliably follows the luteinizing hormone surge by 65 days, give or take one.
The widest window. The pregnancy is the same length — the uncertainty is how long sperm waited for ovulation.
Confirm the pregnancy and get a rough — not exact — idea of litter size.
Puppy skeletons begin showing on X-ray from here.
The accurate puppy count that tells you when whelping is actually done on the night.
Twice-daily rectal temps — a sustained drop below ~99°F usually means puppies within 12–24 hours.
Measured from ovulation, canine pregnancy is remarkably consistent: 63 days, give or take about one. Measured from a breeding date it only looks variable (anywhere from 57 to 72 days) because sperm can survive up to a week in the reproductive tract waiting for ovulation — the pregnancy itself is the same length.
Ovulation date from progesterone testing, by far — it pins whelping to a two-to-three-day window. The LH surge date is nearly as good (whelping follows it by 65 ± 1 days). A breeding date alone leaves a roughly ten-day window.
Ultrasound is reliable from about day 25–30 after ovulation. Relaxin blood tests work in a similar window. X-rays only become useful after day 45, when puppy skeletons mineralize — and day 55 or later is the best time to count puppies accurately.
Track her rectal temperature twice daily from about day 58. A sustained drop below roughly 99°F (37.2°C) usually means labor within 12–24 hours. Nesting, restlessness, and refusing food are the other classic signs.
The numbers behind this calculator come from veterinary literature and clinical references, not folklore:
Breeders on Whelpify open the waitlist the day the ultrasound confirms — litter page live, applications flowing, deposits collected — so every puppy has a family before go-home day.
Predict your female dog's next heat and likely fertile window from her last heat date — with an honest ± range, not a fake-precise date.
Open the calculator From birth to go-home day, mapped out.Enter a litter’s birth date and get the full development timeline: eyes opening, weaning, first vaccines, socialization windows, and go-home day.
Open the calculator How big will this puppy get?Estimate a puppy's adult weight from their current age and weight using size-class growth curves — with an honest range, plus when they'll finish growing.
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