Calculate your cat's due date, track pregnancy milestones, and get stage-by-stage care guidance. Covers the full 63-67 day feline gestation period.
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. This calculator provides 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.
For best results, combine calculator output with direct observation and periodic check-ins with a veterinarian or qualified advisor. Small adjustments made early usually improve comfort, safety, and long-term outcomes more than large corrective changes made later.
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. This cat pregnancy calculator helps you compare outcomes quickly and reduce avoidable mistakes when making day-to-day care decisions. Use the estimate as a planning baseline and confirm final decisions with a qualified professional when risk is high.
Due Date = Breeding Date + 65 days (average). Normal range: 63-67 days. Current gestational day = Today - Breeding Date. Pregnancy week = Floor(Gestational Day ÷ 7) + 1. Pre-term: before day 58. Full-term: day 63-67. Post-term: after day 70 (veterinary concern).
Result: Due date: May 5, 2026 (Day 65)
With a breeding date of March 1, the expected due date is May 5 (65 days). The queen is currently in week 1 of pregnancy. Ultrasound confirmation can be done around March 22-25 (days 21-24).
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.
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.
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.
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.
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.
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.
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.
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.
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.