Gestation / Due Date Calculator
Enter last menstrual period (LMP) date.
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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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.
- 1Human: 280 days from LMP (40 weeks), or 266 days from conception
- 2Add gestation length to breeding/conception date to find due date
- 3Gestational age = days elapsed since LMP or conception
- 4First trimester: 0–13 weeks; Second: 14–26; Third: 27–40
| Animal | Gestation | Notes |
|---|---|---|
| Hamster | 16–17 days | Shortest common pet |
| Mouse | 19–21 days | — |
| Rabbit | 28–35 days | — |
| Cat | 63–65 days | — |
| Dog | 58–68 days | — |
| Pig | 114 days (3m,3w,3d) | Easy to remember |
| Cow | 280–290 days | Same as human! |
| Horse | 335–345 days | ~11 months |
| Elephant | 640–660 days | Longest land mammal |
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Fun Fact
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.
References
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