A gestation calculator estimates the due date or gestational age for humans and animals based on the breeding date or last menstrual period. Gestation length varies significantly by species — from 16 days (hamsters) to 660 days (elephants).
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Pro Tip
For dogs: count 63 days from breeding for a rough due date. Whelping (birth) typically occurs within ±2 days. Puppies born before day 58 or after day 70 often need veterinary attention.
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Did You Know?
The cow and human have nearly identical gestation periods (~280 days) — a coincidence with no evolutionary connection. The longest gestation of any animal is the frilled shark at ~3.5 years.
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