Cat Pregnancy Calculator
Estimate your queen’s due date, track gestation week by week, and prepare for a healthy delivery.
🐱 Queen Gestation & Due Date Calculator
Enter mating date or ultrasound date to estimate whelping timeline
Cat Pregnancy Calculator: Complete Feline Gestation Guide
As a veterinary feline reproduction specialist with over 15 years of experience, I’ve developed this Cat Pregnancy Calculator to help breeders and cat owners track gestation and prepare for delivery. The average cat pregnancy lasts 63-67 days (about 9 weeks), though range can be 58-70 days. Understanding the stages helps ensure a healthy pregnancy and successful whelping.
Cat Gestation Timeline
• Week 1-2 (Days 1-14): Fertilization, implantation. No visible signs.
• Week 3 (Days 15-21): Nipple enlargement (“pinking up”), possible morning sickness.
• Week 4 (Days 22-28): Ultrasound confirms pregnancy (day 25+). Fetal heartbeats visible.
• Week 5 (Days 29-35): Abdomen swelling visible. Appetite increases.
• Week 6 (Days 36-42): Mammary gland development, weight gain noticeable.
• Week 7 (Days 43-49): Nesting behavior begins. Prepare whelping box.
• Week 8 (Days 50-57): X-ray to count kittens (day 50-55). Milk production starts.
• Week 9 (Days 58-63+): Whelping imminent — temperature drop to 99°F (37.2°C).
How to Use This Cat Pregnancy Calculator
- Step 1: Enter the mating/breeding date.
- Step 2: Select queen’s age and previous litter history.
- Step 3: Choose lifestyle (indoor is safest).
- Step 4: Click “Calculate Due Date” — view due date, days pregnant, gestation week, remaining days, and care recommendations.
Signs of Pregnancy in Cats
- Nipple enlargement and color change (“pinking up”) — day 15-21
- Increased appetite (starting week 4)
- Weight gain and abdominal enlargement (week 5+)
- Mammary gland development (week 6+)
- Nesting behavior (seeking quiet, dark places) — week 7+
- Increased affection or changes in behavior
- Morning sickness (occasional vomiting, reduced appetite) — week 3-4
Prenatal Care for Pregnant Queens
- Veterinary visit: Confirm pregnancy (ultrasound day 25-30), check overall health
- Nutrition: Switch to high-quality kitten food (higher protein, calcium, calories) starting week 4-5
- Deworming: Safe dewormer under veterinary guidance — roundworms can pass to kittens
- Vaccinations: Only if approved by vet — avoid modified-live vaccines during pregnancy
- Exercise: Moderate activity — no jumping from heights, strenuous play
- Supplements: Consult vet before adding calcium (excess can cause complications)
Whelping (Labor) Signs — What to Watch For
• Drop in rectal temperature below 100°F (37.8°C) — most reliable sign
• Restlessness, panting, shivering, nesting
• Loss of appetite 24 hours prior
• Milk secretion from nipples
• Vulvar discharge (clear/mucoid)
Whelping Preparation Checklist
- Whelping box: Cardboard or plastic box lined with towels/puppy pads, placed in quiet, warm area (75-80°F)
- Supplies: Clean towels (10+), heating pad (low setting, under towels only), digital thermometer, iodine for umbilical cords, dental floss, scissors, clean gloves
- Emergency vet contact: Have number ready, know location of 24-hour emergency vet
- Kitten milk replacer (KMR): In case queen can’t nurse or produces insufficient milk
- Kitchen scale: To weigh kittens daily
Whelping Stages
- Stage 1 (6-12 hours): Restlessness, nesting, temperature drop. No active straining.
- Stage 2 (30-60 minutes per kitten): Active straining, delivery of kittens. Queen usually removes sac and cleans kitten.
- Stage 3: Delivery of placenta (usually after each kitten).
- Between kittens: Mother rests, nurses delivered kittens, may take 15-60 minutes before next kitten.
When to Call the Vet (Emergency Signs)
- Strong contractions for 30+ minutes without delivering a kitten
- Green/black discharge before first kitten (placental separation)
- Mother in severe distress, collapse, or seizures
- Prolonged resting stage >2-4 hours with more kittens expected
- Bleeding more than 1 tablespoon before delivery
- No labor signs by day 68 post-mating
Post-Whelping Care
- Ensure each kitten nurses within 2 hours (colostrum provides immunity)
- Weigh kittens daily — should gain 7-10g daily
- Keep whelping area clean and warm (85-90°F for first week)
- Monitor queen for fever, lethargy, foul discharge (signs of metritis)
- Schedule postpartum vet exam within 48 hours
Frequently Asked Questions (FAQs)
Average cat pregnancy is 63-67 days (about 9 weeks). Range can be 58-70 days. Use our calculator for due date estimate based on mating date.
Average litter size is 2-6 kittens. First-time mothers often have smaller litters (1-3). Breeds like Siamese may have larger litters (4-8). X-ray at day 50-55 most accurately counts kittens.
Early weeks (1-4) show minimal visible signs. False pregnancy (pseudopregnancy) can occur with similar signs. Ultrasound at day 25-30 is most reliable confirmation.
Switch to kitten food (higher protein and calories) starting week 4-5. Increase portions gradually — by last week, feed 50-100% more than normal. Free-feed dry food, offer multiple wet meals daily.
Schedule vet visit at day 25-30 for ultrasound confirmation. Another visit at day 50-55 for X-ray (kitten count). Any signs of distress, fever, or unusual discharge.
Set up whelping box by day 55. Gather supplies: towels, heating pad, thermometer, iodine, KMR, kitchen scale. Have emergency vet number ready. Watch for temperature drop below 100°F.
Normal labor delivers all kittens within 2-6 hours (max 12 hours). If more than 4 hours between kittens with active straining, contact vet. Kittens born more than 24 hours apart require emergency care.
Wait until kittens are fully weaned (6-8 weeks postpartum). Spaying can be performed once milk production has ceased. Consult your veterinarian for timing.
Final Thoughts: Ensuring a Healthy Pregnancy
A Cat Pregnancy Calculator helps you prepare for your queen’s due date, but nothing replaces professional veterinary care. Schedule prenatal exams, provide high-quality kitten food from week 5, and prepare the whelping box by day 55. Monitor for signs of labor — temperature drop is most reliable. Have emergency vet numbers ready. With proper nutrition, monitoring, and emergency preparedness, you’ll support your queen for a successful delivery and healthy kittens.
For authoritative feline reproduction information, visit AVMA Pet Care and American Association of Feline Practitioners (AAFP).