How this calculator works
Merck's camelid reproduction chapter gives approximately 342 days, plus or minus 10 days, and a 332 to 352 day table range. This more specific clinical chapter supplies the default rather than converting a rounded month count. Date arithmetic uses whole calendar days in UTC, so daylight-saving changes do not shift the result. A negative elapsed value means the reference date is still ahead; a negative remaining value means the estimate has passed.
Formula
Due date = reference date + assumed gestation days. Reverse mode subtracts the same duration. The default is 342 days, with a 332 to 352 day planning window. Days remaining = due date - observation date. The window is not a guarantee.
Worked example
Breeding on 1 January 2026 gives a central estimate of 9 December. Earlier and later planning dates are 29 November and 19 December.
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Frequently asked questions
Does the estimated date confirm pregnancy?
No. A recorded mating may not result in pregnancy. Veterinary examination and appropriate imaging are needed for confirmation.
Can I work backwards from a due date?
Yes. Choose breeding-date mode. The answer is the date implied by the assumed duration, not proof of the actual conception day.
Why might birth occur outside the window?
Breeding and ovulation dates can differ, and litter size, breed and individual history influence timing. Arrange monitoring with your veterinarian instead of using the window as a safety test.