Whelping date calculator
Enter the mating date and get the expected due date, the normal whelping window, and a milestone checklist with calendar dates. Based on the standard 63-day gestation used by vets and kennel clubs.
Ovulation vs mating: gestation is most accurately 63 days from ovulation. When only the mating date is known, 63 days from mating is the standard estimate, with a normal window of about 58 to 65 days. For a single mating or AI, ask your vet about progesterone timing.
Your dates
Expected due date
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63 days from mating
Whelping window
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normal range, days 58-65
Countdown
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to due date
Milestone checklist
Temperature tip: from day 57, take her rectal temperature twice daily. A drop below about 37.2°C (99°F) from her normal 38.3-39.2°C (101-102.5°F) usually means labour within 24 hours. If day 65 passes with no labour and no vet plan in place, call your vet.