Pet Pregnancy Calculator: Due Date by Species
The Pet Pregnancy Calculator estimates your pet's expected due date from the mating date using species-specific gestation periods. Pick the animal, choose when mating happened, and you instantly see the most likely delivery date plus the earliest and latest dates it could fall on.
It works for six common pets — Dog, Cat, Rabbit, Guinea Pig, Hamster (Syrian), and Hamster (Dwarf) — each with its own gestation range. Gestation varies enormously, from about 16 days for a Syrian hamster to roughly 63–65 days for dogs and cats, so the tool tailors every result to the species you select.
Beyond a single date, it tracks pregnancy progress week by week, shows the current developmental stage with care tips, and lays out a full stage-by-stage timeline so you can plan ahead.
How to Use
Select the animal type
Choose from Dog, Cat, Rabbit, Guinea Pig, Hamster (Syrian), or Hamster (Dwarf). Each species loads its own gestation range and developmental stages.
Pick the mating date
Open the date picker and select the day mating occurred. If you are unsure, use the day of the first mating as your best estimate.
View results instantly
The calculator shows the expected due date with its earliest-to-latest range, a progress bar, the current week, days elapsed and remaining, the current stage with care tips, and the full pregnancy timeline.
Features
Six Species Supported
Dog, Cat, Rabbit, Guinea Pig, Hamster (Syrian), and Hamster (Dwarf), each with its own gestation data and developmental stages.
Due Date with Range
Get the average expected due date plus the earliest and latest dates, since gestation length naturally varies within each species.
Visual Progress Bar
A progress bar shows how far along the pregnancy is as a percentage of the average gestation period.
Week & Day Stats
See the current week out of the total, days elapsed since mating, and days remaining until the due date at a glance.
Stage Care Tips
The current stage comes with practical, species-specific care tips covering diet, environment, vet visits, and birth preparation.
Full Pregnancy Timeline
A stage-by-stage timeline from fertilization to delivery, marking completed, current, and upcoming stages.
Dates for Each Stage
Every timeline stage shows its own date range based on your mating date, so you know when each phase begins and ends.
Instant Recalculation
Switch species at any time and the due date, stages, and timeline recalculate immediately while keeping your selected mating date.
Frequently Asked Questions
How is the due date calculated from the mating date?
The calculator adds the species' average gestation period to your mating date to get the expected due date. It also adds the minimum and maximum gestation lengths to produce the earliest and latest dates, giving you a realistic delivery window.
How many days is a dog pregnant?
Dogs are pregnant for about 63 days on average, with a normal range of 58 to 68 days from mating. The calculator uses this range to give a most-likely due date plus the earliest and latest dates delivery could happen.
How long is a cat pregnant?
Cat pregnancy averages about 65 days, typically between 58 and 71 days. Select Cat as the species and the tool applies these figures automatically to estimate the due date and timeline.
Why does it show a date range instead of one date?
Gestation length naturally varies within every species — dog pregnancies, for example, can last 58 to 68 days. The earliest-to-latest range helps you prepare for delivery at any point within that window rather than a single fixed day.
How accurate is the predicted due date?
It uses established veterinary gestation averages for each species, but actual delivery can vary by several days, and factors like litter size or breed can shift it. Treat the result as an estimate and always rely on your veterinarian for professional monitoring.
What if I'm not sure of the exact mating date?
Use your best estimate. If matings happened over several days, choose the first mating date — the earliest-to-latest range will help cover the uncertainty. A veterinarian can narrow the timeline further with ultrasound or palpation.
When can a vet confirm pregnancy?
It depends on the species. In dogs and cats, an ultrasound can usually confirm pregnancy around the fourth week. The care tips shown for the early stages note when ultrasound or palpation is typically possible for your selected pet.
Can I change the species after seeing results?
Yes. Click a different species button and the due date, stages, and timeline recalculate instantly using the new species' gestation data, while keeping the mating date you already selected.
Is my data stored or shared?
No. All calculations happen entirely in your browser. No dates or pet information are sent to any server or stored anywhere.
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