Cat Pregnancy Calculator — How Long Are Cats Pregnant?
Cats are typically pregnant for 63–67 days. Calculate your cat's due date, track pregnancy week by week, and get care tips for every stage.
Enter Mating Details
If unsure of the exact date, use when you first noticed mating behavior
Estimated Due Date
0
Day of Pregnancy
63
Days Remaining
1
Current Week
First Trimester
Trimester
Key Milestone Dates
Day 15-18: Morning sickness possible
Sat, Apr 25, 2026
Day 21-25: Ultrasound confirmation
Fri, May 1, 2026
Day 35: Nipples become pink ("pinking up")
Fri, May 15, 2026
Day 42+: X-ray safe (count kittens)
Fri, May 22, 2026
Day 49: Start preparing nesting area
Fri, May 29, 2026
Day 58: Earliest possible delivery
Sun, Jun 7, 2026
Week-by-Week Pregnancy Timeline
Conception & Fertilization
Development
Mating triggers ovulation (cats are induced ovulators). Fertilized eggs (zygotes) travel down the oviducts toward the uterus. Cell division begins, forming blastocysts by day 5-6.
Queen Behavior
No noticeable changes yet. Your cat may seem completely normal. Some queens may show brief post-mating behavioral changes such as rolling or calling if still in heat.
Care Tips
Continue normal feeding routine. Avoid medications unless prescribed by a vet. If pregnancy was planned, ensure the queen is current on vaccinations and parasite prevention. Do not administer live vaccines during pregnancy.
Implantation
Development
Blastocysts implant into the uterine wall around day 12-14. Each embryo develops its own placenta. The embryos are evenly spaced along both uterine horns.
Queen Behavior
Still largely normal behavior. Some queens may show slightly decreased appetite or mild morning sickness. Nipples may begin very subtle color changes (pinking up).
Care Tips
Maintain a high-quality diet. Avoid rough handling or stress. Keep environment calm and stable. Do not change food abruptly.
Early Embryo Development
Development
Embryos are about 1 cm long. Major organ systems begin forming: heart starts beating, neural tube closes, limb buds appear. Embryos become visible on ultrasound by day 21.
Queen Behavior
Nipples become noticeably pink and enlarged ('pinking up'). This is often the first visible sign of pregnancy. Slight weight gain may begin. Some cats show increased affection.
Care Tips
Gradually increase food portions by 10-15%. Ensure access to fresh water at all times. Begin transitioning to a kitten-formula food (higher calorie and calcium content) for the queen.
Vet Milestone
Ultrasound confirmation possible (day 21-25). Heartbeats may be detectable. Ultrasound can confirm pregnancy but is not reliable for counting exact number of kittens.
Organogenesis
Development
Embryos are 2.5-3.5 cm. Facial features forming: eyes, ears, whisker pads developing. Digits separating on paws. Internal organs continuing rapid development. Skeleton begins to ossify.
Queen Behavior
Morning sickness may occur — vomiting or decreased appetite for a few days is normal. Abdomen beginning to swell slightly. The queen may seek more rest and quiet spots.
Care Tips
Do not pick up the queen by her abdomen. Offer smaller, more frequent meals if experiencing nausea. Food intake should be about 25% above normal by now. Ensure she has comfortable resting areas.
Vet Milestone
Veterinarian can palpate (feel) individual embryos in the abdomen between days 25-30. This is a delicate window — palpation should only be done by experienced professionals.
Fetal Growth
Development
Embryos are now officially called fetuses (~5 cm). Skin thickens and fur pigment begins developing. Claws form. Gender differentiation occurring. Fetuses become too large to palpate individually.
Queen Behavior
Noticeable weight gain and abdominal enlargement. Appetite increases significantly. The queen may become more sedentary and less interested in rough play. Nesting instincts may begin.
Care Tips
Increase food to approximately 50% above pre-pregnancy intake. Continue feeding kitten-formula food. Ensure the queen has easy access to clean litter boxes (she may have trouble with high-sided boxes as she grows). Provide quiet, private nesting areas.
Rapid Growth & Ossification
Development
Fetuses are ~7.5 cm and growing rapidly. Skeleton is calcifying — bones become visible on X-ray from day 42+. Fur is growing. Fetal movement can be felt by placing a hand on the queen's abdomen.
Queen Behavior
Abdomen is obviously enlarged. The queen may have difficulty grooming her hindquarters. Appetite remains high. She may begin more obvious nesting behavior — searching for quiet, enclosed spaces.
Care Tips
Food intake should be approximately 50-75% above normal. Feed ad libitum (free choice) if the queen is not overeating. Prepare a nesting/birthing box: a quiet, warm, enclosed space lined with clean towels or blankets.
Vet Milestone
X-ray safe and recommended from day 42+ to count fetal skeletons. This gives the most accurate kitten count. Counting heads or spines on X-ray helps you know when delivery is complete.
Maturation & Fetal Movement
Development
Fetuses are ~10 cm. Fur fully developed. Kittens are making active movements visible through the queen's abdomen. Lungs are maturing but not yet fully functional. Eyes are formed but sealed shut.
Queen Behavior
Very obvious pregnancy. The queen may lose appetite slightly as the uterus presses on the stomach. Increased rest and sleep. May become more clingy or alternatively more reclusive. Mammary glands developing visibly.
Care Tips
Offer multiple small meals throughout the day rather than large meals. Ensure the birthing box is set up and in a quiet location. Begin gathering supplies: clean towels, dental floss (for tying cords if needed), bulb syringe, heating pad, vet emergency number.
Pre-Birth Preparation
Development
Fetuses are ~12-13 cm and nearly fully developed. Lungs reaching final maturity. Kittens born after day 56 typically have a good chance of survival. Kittens positioning for birth (head-first or breech — both are normal in cats).
Queen Behavior
Active nesting behavior — shredding paper, rearranging bedding, trying various spots. Mammary glands enlarge and may begin producing milk. Appetite may decrease in the final days. The queen may become restless or unusually affectionate.
Care Tips
Take the queen's temperature twice daily. Normal is 38.1-39.2°C (100.5-102.5°F). A drop below 37.8°C (100°F) typically indicates labor within 24 hours. Keep the birthing area warm (around 29-32°C / 85-90°F for newborn kittens). Have your vet's emergency number readily accessible.
Vet Milestone
Final prenatal vet check recommended. Confirm kitten count if X-ray was not done at week 6. Discuss signs of dystocia (difficult birth) and when to seek emergency help.
Labor & Delivery
Development
Full-term kittens weigh 85-115 grams at birth. Average gestation is 63-67 days, but 58-70 days is within normal range. Kittens are born in amniotic sacs which the mother will break. Each kitten has its own placenta delivered shortly after.
Queen Behavior
Stage 1 labor: restlessness, panting, vocalizing, nesting, loss of appetite, possible vomiting. Lasts 6-24 hours. Stage 2: active contractions and delivery of kittens, typically 15-60 minutes between each kitten. Stage 3: passage of placentas. The queen will chew umbilical cords and clean each kitten to stimulate breathing.
Care Tips
Provide a calm, dim, quiet environment. Do not disturb the queen unless there is a problem. Monitor from a distance. Intervene only if: straining for more than 60 minutes without producing a kitten, more than 4 hours between kittens when more are expected, green/black discharge without a kitten following within 15 minutes, or the queen appears distressed or exhausted. Count placentas — there should be one per kitten.
Vet Milestone
Contact vet immediately if: active straining for over 60 minutes without delivery, kitten is stuck in the birth canal, queen appears lethargic or has heavy bright red bleeding, no labor by day 70 of pregnancy, or fewer placentas than kittens are delivered.
Week-by-Week Cat Pregnancy Development
Cat pregnancy (gestation) lasts an average of 63 to 67 days, or approximately 9 weeks. During this relatively short period, kittens develop from single fertilized cells into fully formed, fur-covered newborns ready to breathe, nurse, and bond with their mother. Understanding each week of pregnancy helps you provide the best possible care for your queen and her developing kittens.
Cats are induced ovulators, meaning the act of mating itself triggers the release of eggs from the ovaries. This is different from humans and dogs, who ovulate on a regular cycle. Because ovulation occurs 24-48 hours after mating, pinpointing the exact conception date can be challenging. The mating date is typically used as Day 1 for calculating the due date.
Weeks 1-3: The Invisible Stage
During the first three weeks, there are few outward signs of pregnancy. Fertilized eggs travel down the oviducts, implant in the uterine wall around day 12-14, and begin rapid cell division. By day 21, embryos are about 1 cm long with developing hearts, neural tubes, and limb buds. The earliest visible sign for owners is "pinking up" of the nipples around days 15-21. Ultrasound can confirm pregnancy from day 21.
Weeks 4-6: Rapid Development
This is the period of most dramatic development. Embryos develop facial features, digits, internal organs, and skeletal structures. They transition from embryos to fetuses around day 29. The queen's abdomen begins to visibly swell, appetite increases substantially, and morning sickness may briefly occur around week 4. By day 42, fetal skeletons have calcified enough for X-ray imaging, which provides the most accurate kitten count.
Weeks 7-9: Final Preparation & Delivery
In the final weeks, kittens grow rapidly in size and weight while their lungs reach final maturity. The queen shows obvious nesting behavior, her mammary glands enlarge and may begin producing milk, and appetite may decrease as the uterus presses on the stomach. Kittens born after day 56 typically have good survival chances. Most cats deliver naturally between days 63-67, with the entire labor process lasting 2 to 24 hours depending on litter size.
Signs of Cat Pregnancy
Knowing what to look for at each stage helps you confirm pregnancy early and provide timely care. Here are the most reliable signs, roughly in the order they appear:
Pinking Up (Days 15-21)
The nipples become noticeably pinker, more prominent, and slightly swollen. This is often the first visible sign of pregnancy and is most obvious in first-time queens. The surrounding fur may also thin slightly to prepare for nursing.
Morning Sickness (Days 15-25)
Some queens experience brief bouts of nausea or vomiting, similar to human morning sickness. This is usually mild and resolves within a few days. If vomiting is severe or persists for more than 2-3 days, consult your veterinarian to rule out other causes.
Behavioral Changes (Weeks 2-4)
Many pregnant cats become more affectionate, seeking extra attention and physical contact. Some queens become quieter or more reclusive. Heat cycles will stop entirely. If your cat was regularly cycling and suddenly stops calling, pregnancy is a strong possibility.
Weight Gain & Abdominal Swelling (Weeks 4-9)
A pregnant queen will typically gain 1-2 kg (2-4 lbs) over the course of pregnancy. Abdominal swelling becomes noticeable from week 4-5. By weeks 7-8, the pregnancy is unmistakable, with visible fetal movement often seen through the queen's abdomen.
Increased Appetite (Weeks 3-7)
As the kittens grow, the queen's caloric needs increase dramatically. By mid-pregnancy, she may be eating 50-75% more than her pre-pregnancy intake. In the final 1-2 weeks, appetite may decrease slightly as the uterus compresses the stomach.
Nesting Behavior (Weeks 7-9)
In the final weeks, your cat will actively seek out quiet, enclosed, private spaces to give birth. She may shred paper, rearrange bedding, try closets and boxes, and become restless. Provide a prepared birthing box in a quiet, warm location to encourage her to use it.
Nutrition During Cat Pregnancy
Proper nutrition is critical for the health of both the queen and her developing kittens. A pregnant cat's nutritional needs change significantly throughout gestation, and inadequate nutrition can lead to underweight kittens, difficult delivery, and poor milk production.
Switch to Kitten Food
By week 3 of pregnancy, transition your cat to a high-quality kitten-formula food. Kitten food is designed for growth and contains higher levels of protein (minimum 35%), fat (minimum 18%), calcium, phosphorus, and DHA, all of which are essential for fetal development. The queen should remain on kitten food throughout pregnancy and nursing until kittens are weaned.
Feeding Schedule by Week
- Weeks 1-2: Continue normal feeding. No dietary changes needed yet.
- Week 3: Begin gradual transition to kitten food over 5-7 days. Increase portions by 10-15%.
- Week 4: Food intake should be approximately 25% above pre-pregnancy amounts. Offer smaller, more frequent meals if morning sickness occurs.
- Weeks 5-6: Increase to 50% above normal intake. Consider switching to free-choice (ad libitum) feeding if the queen is not overeating.
- Weeks 7-8: Intake may reach 50-75% above normal. Offer 3-4 small meals per day, as the growing uterus limits stomach capacity.
- Week 9: Appetite may decrease in the final days before labor. This is normal. Ensure food and fresh water remain available.
Important Nutritional Guidelines
- Always provide fresh, clean water. Pregnant cats need increased hydration.
- Do not supplement with calcium or vitamins unless directed by your vet. Over-supplementation can cause dangerous imbalances, including eclampsia.
- Avoid raw or undercooked meat during pregnancy due to the risk of toxoplasmosis and bacterial infections.
- Do not feed dog food to pregnant cats. Dog food lacks taurine and adequate protein levels essential for feline health.
- Monitor body weight weekly. A healthy pregnant queen should gain steadily without becoming obese.
Signs of Labor & Delivery
Cat labor occurs in three distinct stages. Understanding each stage helps you know when delivery is progressing normally and when to seek veterinary help.
Stage 1: Pre-Labor (6-24 hours)
The cervix begins to dilate and uterine contractions start, but they are not yet visible externally. This stage can last from 6 to 24 hours or even longer in first-time mothers.
- • Body temperature drops below 37.8°C (100°F), usually 12-24 hours before delivery
- • Restlessness, pacing, frequent visits to the nesting box
- • Loss of appetite, possible vomiting
- • Vocalizing, panting, or heavy breathing
- • Frequent licking of the genital area
Stage 2: Active Labor & Kitten Delivery
Visible abdominal contractions begin and kittens are delivered. Each kitten is born in an amniotic sac which the queen typically breaks open. She will chew the umbilical cord and vigorously lick the kitten to stimulate breathing.
- • Strong, visible abdominal contractions
- • Kittens typically delivered every 15-60 minutes, but intervals up to 2 hours can be normal
- • Both head-first and breech (tail-first) presentations are normal in cats (about 40% are breech)
- • The queen may rest, nurse, and groom between kittens
Stage 3: Placenta Delivery
Each kitten has its own placenta, which is delivered shortly after the kitten (usually within 5-15 minutes). Stages 2 and 3 alternate until all kittens and placentas have been delivered. It is important to count placentas.
- • Count each placenta - there should be one per kitten
- • The queen may eat some placentas, which is normal behavior and provides nutrients
- • A retained placenta is a medical emergency requiring veterinary attention
Emergency Signs
Contact Your Vet Immediately If:
- ! Active straining for more than 60 minutes without delivering a kitten. This may indicate dystocia (obstructed labor) which requires immediate veterinary intervention.
- ! More than 4 hours between kittens when you know more are expected (based on X-ray count). Prolonged intervals may indicate uterine inertia.
- ! Green or black vaginal discharge without a kitten following within 15 minutes. This indicates placental separation, and the kitten must be delivered quickly.
- ! A kitten is visibly stuck in the birth canal. Do not attempt to pull the kitten unless trained - improper traction can cause injury to both queen and kitten.
- ! Heavy, bright red bleeding (more than 2 tablespoons). Some bloody discharge is normal during delivery, but excessive bright red blood indicates hemorrhage.
- ! Queen appears lethargic, weak, or collapsed. This could indicate internal bleeding, infection, uterine rupture, or metabolic emergency (eclampsia).
- ! No labor by day 70 of pregnancy. Post-term pregnancies carry increased risk of stillbirth and complications. Your vet may recommend induction or cesarean section.
- ! Fewer placentas delivered than kittens. A retained placenta can cause serious infection (metritis) and must be treated promptly with veterinary care.
Always have your veterinarian's emergency phone number readily available before your cat's due date. Many complications require intervention within minutes, not hours.
Sources: Gestation period and developmental milestones based on Clinical Management of Pregnancy in Cats, Topics in Companion Animal Medicine (NIH/PMC). Pregnancy signs and labor guidance from VCA Animal Hospitals and Cats Protection UK. Due dates are estimates — contact your veterinarian if delivery occurs before day 60 or after day 70.
Frequently Asked Questions
Cats are pregnant for an average of 63-67 days (approximately 9 weeks), though the normal range spans 58 to 71 days. First-time mothers and certain breeds may vary slightly within this range. Siamese cats, for example, sometimes carry a few days longer. If your cat has not delivered by day 70, contact your veterinarian as intervention may be needed.
The earliest visible sign is 'pinking up' of the nipples around days 15-21, where the nipples become noticeably pinker and slightly enlarged. Other early signs include mild morning sickness, slight behavior changes (increased affection), and gradual weight gain. By weeks 4-5, the abdomen visibly swells. A veterinarian can confirm pregnancy via ultrasound from day 21 or by abdominal palpation between days 25-30.
Ultrasound can detect pregnancy as early as day 21-25 after mating and can show fetal heartbeats. Abdominal palpation by an experienced veterinarian is possible between days 25-30, though this window is brief and must be done gently. X-rays are most useful from day 42 onward, when fetal skeletons have calcified enough to be visible, providing the most accurate kitten count by counting skulls and spines.
The average litter size for domestic cats is 4-6 kittens, but litters can range from 1 to 12 or more. First-time mothers and older queens typically have smaller litters. Breed, genetics, the queen's age and health, and whether she was bred by one or multiple toms all influence litter size. An X-ray after day 42 of pregnancy provides the most reliable kitten count.
Transition your pregnant cat to a high-quality kitten-formula food by week 3 of pregnancy, as it provides the extra calories, protein, calcium, and nutrients both the queen and developing kittens need. Gradually increase food portions: approximately 25% above normal by week 4, 50% by week 5, and 50-75% by weeks 6-7. In the final weeks, offer multiple smaller meals throughout the day, as the growing uterus limits stomach capacity. Always ensure fresh, clean water is available.
Key signs of imminent labor include: a noticeable drop in body temperature below 37.8 degrees Celsius (100 degrees Fahrenheit) typically within 24 hours of delivery, increased restlessness and nesting behavior, loss of appetite, vocalizing or panting, and frequent licking of the genital area. Stage 1 labor (pre-delivery) lasts 6-24 hours. Once active contractions begin (stage 2), kittens are usually delivered every 15-60 minutes.
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