Cat Pregnancy Calculator
Calculate your cat's due date instantly — enter the mating date and get the kitten arrival date, current gestational stage and a full week-by-week pregnancy timeline. Free feline gestation calculator.
Cat Gestation Calculator Tool
Average: 65 days.
Gestation can vary by breed. Siamese cats often deliver earlier (60–62 days) while Persians may go up to 68–72 days.
Why use this free cat gestation calculator?
This tool does more than just calculate a due date — it gives you the complete gestational stage breakdown, current development notes and care timeline that most other tools leave out.
How to calculate your cat's due date
Cat gestation timeline — stage by stage
| Period | Stage | Key events & signs |
|---|---|---|
| Week 1 (Days 1–7) | Fertilisation | Invisible — no external signs |
| Week 2 (Days 8–14) | Implantation | Embryos attach to uterine wall |
| Week 3 (Days 15–21) | Organ formation begins | Pink nipples, possible morning sickness |
| Week 4 (Days 22–28) | Major organs forming | Vet ultrasound can confirm pregnancy |
| Week 5 (Days 29–35) | Skeleton calcifies | Belly noticeably enlarged |
| Week 6 (Days 36–42) | Rapid fetal growth | Switch to kitten food |
| Week 7 (Days 43–49) | Kittens nearly fully formed | Prepare nesting box |
| Week 8 (Days 50–56) | Final growth phase | Nesting behaviour intensifies |
| Week 9 (Days 57–65) | Pre-birth | Temperature drop signals imminent birth |
Signs of queening approaching:
- Pink, enlarged nipples at 3 weeks
- Morning sickness weeks 2–3
- Belly visibly rounded by week 5
- Nesting and seeking quiet spaces (week 8)
- Temperature drop below 37.8°C (12–24 h before birth)
Pre-queening care checklist:
- Switch to high-quality kitten food from week 6
- Vet check at week 3–4 for ultrasound confirmation
- Prepare a quiet nesting box by week 7
- Avoid all vaccines and medications unless vet-approved
- Weigh cat weekly — expect 1–2 kg total gain
How this cat gestation calculator compares
Most free cat pregnancy calculators show only a due date. LazyTools provides the gestational stage breakdown, development notes and care checklist that make this a genuinely useful tool.
| Feature | LazyTools | Cat-World.com | Spruce Pets | PetMD |
|---|---|---|---|---|
| Shows exact due date | ✓ | ✓ | ✓ | ✓ |
| Week-by-week stage breakdown | ✓ | ✗ | ✗ | ✗ |
| Development notes per stage | ✓ | ✗ | ✗ | ✗ |
| Signs & symptoms checklist | ✓ | ✗ | ✗ | ✗ |
| Breed variation notes | ✓ | ✗ | ✗ | ✗ |
| Care timeline & feeding guide | ✓ | ✗ | ✗ | ✗ |
Cat Gestation Period: Complete Guide
How long is a cat pregnant? The complete feline gestation timeline
See the interactive calculator above for a personalised cat gestation timeline based on your specific breeding date. The information below provides the complete background on cat pregnancy.
Cat pregnancy stages week by week
See the interactive calculator above for a personalised cat gestation timeline based on your specific breeding date. The information below provides the complete background on cat pregnancy.
Signs of cat pregnancy: what to look for at each stage
See the interactive calculator above for a personalised cat gestation timeline based on your specific breeding date. The information below provides the complete background on cat pregnancy.
Cat gestation period by breed: does breed affect pregnancy length?
See the interactive calculator above for a personalised cat gestation timeline based on your specific breeding date. The information below provides the complete background on cat pregnancy.
How to calculate a cat's due date accurately
See the interactive calculator above for a personalised cat gestation timeline based on your specific breeding date. The information below provides the complete background on cat pregnancy.
Caring for a pregnant cat: nutrition, vet care and nesting
See the interactive calculator above for a personalised cat gestation timeline based on your specific breeding date. The information below provides the complete background on cat pregnancy.
What to expect during cat labour and queening
See the interactive calculator above for a personalised cat gestation timeline based on your specific breeding date. The information below provides the complete background on cat pregnancy.
The cat gestation period averages 65 days, with a normal range of 58 to 72 days. Use the interactive cat gestation calculator above to calculate the expected queening date from any mating date. The tool also shows you the current gestational stage, development milestones, and days remaining in the pregnancy.