Cat Pregnancy Calculator

About the Cat Pregnancy Calculator

The average feline gestation period is 63-67 days, with most queens delivering around day 65. This calculator helps you track your cat's pregnancy from the estimated breeding date through delivery, with week-by-week milestones and care recommendations.

Understanding the stages of feline pregnancy is essential for providing proper nutrition, monitoring health, and preparing for delivery. During the first three weeks, the fertilized eggs implant in the uterine wall and the embryos begin developing. By week four, a veterinarian can often confirm pregnancy via ultrasound or palpation. The final weeks bring rapid fetal growth, and the queen's nutritional needs increase significantly.

Proper prenatal care — including appropriate diet, parasite prevention, vaccination timing, and nesting preparation — significantly improves outcomes for both the mother and kittens. It gives a complete timeline with specific actions and observations for each stage of pregnancy. Keeping a simple daily log of appetite, behavior, and nesting activity also makes vet follow-ups faster and more actionable.

When This Page Helps

Tracking pregnancy stages ensures you provide the right nutrition, schedule veterinary checkups at optimal times, and prepare properly for delivery. This calculator eliminates guesswork about due dates and helps identify if the pregnancy is progressing on schedule.

How to Use the Inputs

1. Enter the estimated breeding or mating date
2. Optionally select if this is a first pregnancy or subsequent
3. View the calculated due date and current pregnancy stage
4. Review week-by-week milestones and physical changes
5. Check nutrition and care recommendations for the current stage
6. Note the pre-labor signs to watch for in the final week
7. Prepare a nesting box starting at day 55

Example Calculation

Tips & Best Practices

• Schedule a vet visit for confirmation and health check around day 21-25
• Switch to kitten food gradually starting week 3 for proper fetal nutrition
• Prepare a nesting box in a quiet, warm location by day 55
• Keep other pets away from the nesting area as the due date approaches
• Monitor the queen's temperature daily in the last week — a drop signals labor within 24 hours
• Have your vet's emergency number and a kitten care kit ready before the due date

Week-by-Week Feline Pregnancy Overview

Weeks 1-2: Fertilization and implantation occur. No visible signs. Continue normal feeding. Weeks 3-4: Embryos develop rapidly. Morning sickness may occur. Nipples become pink ("pinking up"). Start kitten food transition. Weeks 5-6: Significant weight gain begins. Belly visibly enlarges. Increase food by 25%. Week 7-8: Fetal movement may be felt. Queen begins seeking nesting spots. Mammary glands fill with milk. Week 9: Full-term. Watch for labor signs. Ensure nesting box is ready and quiet.

Complications to Watch For

Eclampsia (low blood calcium) can occur in late pregnancy or early lactation, causing tremors, fever, and collapse. Dystocia (difficult birth) affects about 5% of deliveries and is more common in certain breeds like Persians and Himalayans. Resorption of fetuses can occur in the first 4 weeks without any visible signs. Infectious diseases like FeLV and FIV can be transmitted to kittens, making pre-pregnancy testing essential.

Preparing for Kittens

Set up a "queening box" — a large cardboard box with low sides (for the mother) and high sides (to contain kittens). Line with old towels or newspapers. Keep the room at 75-80°F for newborn thermoregulation. Prepare supplemental feeding supplies (KMR kitten milk replacer, bottle) in case the queen can't nurse. Have clean scissors and thread ready for umbilical cord management if needed.

Frequently Asked Questions

• How long is a cat pregnant?

  Cats are pregnant for 63-67 days on average, with 65 days being the most common gestation length. Some breeds may run slightly shorter or longer. Deliveries before day 58 or after day 70 require veterinary attention.

• When can I confirm my cat is pregnant?

  A veterinarian can detect pregnancy via ultrasound as early as day 16-20, but day 25-30 is more reliable. Abdominal palpation is possible around day 17-25. X-rays can count kittens after day 42 when skeletons calcify.

• How many kittens will my cat have?

  The average litter size is 4-6 kittens, but first-time mothers often have smaller litters (2-4). Some cats can have up to 12 kittens. An x-ray after day 42 can provide an accurate count.

• What should I feed a pregnant cat?

  Switch to a high-quality kitten food by week 3-4 of pregnancy. Kitten food provides the extra calories, protein, and calcium needed. Increase food amounts gradually — by late pregnancy, the queen may need 50% more calories than normal.

• What are signs my cat is about to give birth?

  Signs of imminent labor include: restlessness and nesting behavior, body temperature drop below 99°F (37.2°C), loss of appetite, milk present in nipples, and vocalization or panting. Active labor starts with visible contractions.

• When should I call the vet during delivery?

  Call the vet if: active straining for more than 60 minutes without producing a kitten, more than 2 hours between kittens, green or dark discharge before any kitten is born, the queen seems exhausted or in distress, or delivery hasn't started by day 70. This keeps planning practical and lowers the chance of preventable errors.