Free Tool · Mating Date to Due Date · Week-by-Week Guide

Cat Pregnancy Calculator: Due Date, Weekly Stages & Birth Guide

Your cat is pregnant, now what? Enter the mating date to get an instant due date, a personalized week-by-week pregnancy calendar, developmental milestones, and a birth preparation guide.

Feline gestation: 63-65 days averageWeek-by-week development guideBirth preparation checklist

Calculate Your Cat's Due Date

Step 1

Pregnancy dates

If your cat mated on multiple days, enter the first date for the earliest possible due date.

Date certainty

Step 2

Optional details

If pregnancy is not confirmed yet, ultrasound from day 21 is the clearest next step. First litters deserve extra observation because normal behavior is harder to predict.

Pregnancy Calendar

Luna's 63-Day Pregnancy Calendar

Mating: Jun 10, 2026 to due: Aug 12, 2026

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Mating

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Day 2

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Day 70

Mating dateWeek 1-4Week 5-6Week 7-8Due weekVet alert

Week-by-Week

Cat Pregnancy Week by Week: Complete Development Guide

What's happening inside, and what you should be doing.

Week 1 · Day 1-7 · Fertilization & Early Cell Division

Fetal Development

  • · Eggs are fertilized within 24-36 hours of mating.
  • · Early embryos divide as they travel toward the uterus.
  • · Embryos are microscopic and not yet implanted.

Mother's Signs

  • · No visible signs yet.
  • · Normal appetite and behavior.
  • · Some queens may become slightly more affectionate.

Your Action Items This Week

  • · Keep the normal feeding routine.
  • · Avoid medications unless prescribed by a veterinarian.
  • · Minimize stress and household disruption.

Vet Actions

  • · No routine vet action this week unless symptoms concern you.

Nutrition: Normal maintenance diet. No calorie increase is needed yet.

Week 2 · Day 8-14 · Implantation

Fetal Development

  • · Embryos implant into the uterine wall around day 12-14.
  • · Placental connections begin forming.
  • · Embryos are still very small, usually 1-2mm.

Mother's Signs

  • · Nipples may begin to pink up.
  • · Slight appetite increase is possible.
  • · Some cats seek quieter spaces.

Your Action Items This Week

  • · Watch for pink, enlarged nipples.
  • · Continue the normal diet.
  • · Avoid handling or pressing the abdomen.

Vet Actions

  • · No routine vet action this week unless symptoms concern you.

Nutrition: Normal maintenance diet with fresh water always available.

Week 3 · Day 15-21 · Embryo Development Begins

Fetal Development

  • · The neural tube begins forming.
  • · The fetal heartbeat begins around day 16-17.
  • · Limb buds and early organs begin developing.

Mother's Signs

  • · Nipples are usually more clearly pink.
  • · Appetite often increases.
  • · Mild morning sickness can occur in some cats.

Your Action Items This Week

  • · Schedule a first vet visit for confirmation.
  • · Begin transitioning toward kitten food.
  • · Avoid raw meat exposure and outdoor hunting when possible.

Vet Actions

  • · Ultrasound can confirm pregnancy from around day 21.
  • · Discuss deworming and medication safety with your vet.

Nutrition: Start a gradual transition to kitten food if pregnancy is likely.

Week 4 · Day 22-28 · Rapid Embryo Growth

Fetal Development

  • · Eyes, ears, toes, and whisker pads begin forming.
  • · Embryos are approximately 10-15mm.
  • · Gender differentiation begins.

Mother's Signs

  • · The abdomen may feel firmer.
  • · Weight gain becomes noticeable.
  • · Nipples are prominently enlarged and pink.

Your Action Items This Week

  • · Use this as the optimal palpation window with a veterinarian.
  • · Transition toward 50% kitten food and 50% adult food.
  • · Begin identifying a quiet nesting location.

Vet Actions

  • · Day 28 is the optimal window for veterinary palpation.
  • · Discuss birth preparation and emergency planning.

Nutrition: Increase food by about 10% and offer three meals daily.

Week 5 · Day 29-35 · Visible Pregnancy

You are here

Fetal Development

  • · Fetuses are now recognizable as kittens.
  • · Claws and early coat development begin.
  • · Internal organs are largely formed.

Mother's Signs

  • · The abdomen is visibly rounded.
  • · Appetite increases and meals may need to be smaller.
  • · Mammary glands enlarge.

Your Action Items This Week

  • · Switch fully to kitten food.
  • · Feed three to four smaller meals daily.
  • · Limit high jumping if her belly is making movement awkward.

Vet Actions

  • · No routine vet action this week unless symptoms concern you.

Nutrition: Increase food by about 25%. Kitten food is preferred.

Week 6 · Day 36-42 · Rapid Weight Gain

Fetal Development

  • · Fetuses are approximately 45-55mm.
  • · Coat color patterns begin developing.
  • · Skeletal ossification begins.

Mother's Signs

  • · Abdominal enlargement is obvious.
  • · Colostrum may appear in some cats.
  • · Activity often decreases.

Your Action Items This Week

  • · Set up the nesting box and keep it accessible.
  • · Offer kitten food free-choice if she is hungry.
  • · Keep the litter box very clean.

Vet Actions

  • · X-rays may start showing skeletal outlines, though counting is more reliable after day 45.

Nutrition: Increase food by about 50%. Free-choice kitten food is often appropriate.

Week 7 · Day 43-49 · Kittens Are Fully Formed

Fetal Development

  • · Major organs are formed; growth and refinement continue.
  • · Kittens are approximately 60-70mm.
  • · Movement is often visible through the abdomen.

Mother's Signs

  • · The abdomen is very large.
  • · Mobility decreases.
  • · She may seek secluded spaces more often.

Your Action Items This Week

  • · Prepare the birth kit.
  • · Keep the nesting box in its final location.
  • · Confirm emergency vet contact details.

Vet Actions

  • · X-ray at day 45-49 is strongly recommended to count kittens.
  • · Knowing litter size helps confirm all kittens have been born.

Nutrition: Free-choice kitten food. She may eat about 75% more than usual.

Week 8 · Day 50-56 · Pre-Birth Preparation

Fetal Development

  • · Kittens are approximately 80-90mm.
  • · Lungs mature in preparation for breathing air.
  • · Kittens move into birth position.

Mother's Signs

  • · Nesting behavior intensifies.
  • · Milk may be present.
  • · Restlessness and reduced appetite can appear.

Your Action Items This Week

  • · Start monitoring rectal temperature twice daily from day 56.
  • · Keep the birth kit ready.
  • · Reduce household stress and visitors.

Vet Actions

  • · A final pre-birth check is useful if anything seems uncertain.
  • · Confirm after-hours emergency instructions.

Nutrition: Free-choice kitten food. Appetite may drop in the last 24-48 hours.

Week 9 · Day 57-65+ · Birth (Queening)

Fetal Development

  • · Kittens are fully developed and ready for birth.
  • · Average birth weight is often 85-115g.
  • · Each kitten is born in an amniotic sac followed by a placenta.

Mother's Signs

  • · Visible contractions and active straining.
  • · Vocalization, licking, and clear or slightly bloody discharge.
  • · The first kitten usually arrives within 30-60 minutes of active straining.

Your Action Items This Week

  • · Observe calmly and avoid interfering unless needed.
  • · Time the interval between kittens.
  • · Count one placenta per kitten and keep the nest warm.

Vet Actions

  • · Call the vet if she strains more than 30 minutes with no kitten.
  • · Call the vet if more than 2 hours pass between kittens with visible straining.
  • · Call the vet for collapse, bright bleeding, foul discharge, or a stuck kitten.

Nutrition: Offer food and water during and after birth. Lactation needs begin immediately.

Signs

Signs Your Cat Is Pregnant

Early signs can appear as soon as 2-3 weeks after mating.

Earliest Signs (2-3 weeks)

  • Pinking up: nipples enlarge and turn rosy pink.
  • Behavior changes: more affectionate or more withdrawn.
  • Morning sickness: occasional vomiting in some cats.

Obvious Signs (4-5 weeks)

  • Rounded abdomen becomes visible.
  • Weight gain becomes noticeable.
  • Mammary glands enlarge and prepare for milk.

Veterinary Confirmation

  • Ultrasound: day 21+.
  • Palpation: day 28 optimal window.
  • X-ray: day 45+ for kitten count.

Care Guide

How to Care for a Pregnant Cat

Nutrition During Pregnancy

Week 1-5 usually stays near maintenance. From week 6 onward, switch fully to kitten food, offer smaller meals or free-choice feeding, and avoid calcium or human prenatal supplements unless prescribed.

Veterinary Care During Pregnancy

Plan confirmation around day 21-28, X-ray kitten count around day 45-49, and a final pre-birth check around day 55-60 if anything feels uncertain.

Preparing the Nesting Area

Set up a quiet, warm, low-light nesting box by week 6-7. Use washable towels and puppy pads, but accept her chosen location if she picks a closet or under-bed space.

Labor Signs

Signs of Labor in Cats: What to Watch For

The Most Reliable Sign: Temperature Drop

Normal rectal temperature is 38.0-39.2°C (100.4-102.5°F). Labor is often within 24 hours when temperature drops below 37.8°C (100°F). Start monitoring twice daily from day 56.

Printable Labor Signs Checklist

1-2 Weeks Before Birth

  • Nesting behavior begins: She seeks quiet, secluded spots and rearranges bedding.
  • Mammary glands enlarged: Breasts become visibly swollen and firm.
  • Milk production: Colostrum may be expressed from nipples.
  • Reduced activity: Sleeping more and playing less is common.

24-48 Hours Before Birth

  • ★ Temperature drop: Rectal temperature drops below 37.8°C / 100°F.
  • Loss of appetite: She refuses food or eats very little.
  • Restlessness: Pacing and repeatedly entering or leaving the nest.
  • Clear vaginal discharge: A clear or slightly pink mucus plug may appear.

Hours Before Birth

  • ★ Visible contractions: The abdomen visibly tightens and relaxes.
  • ★ Active straining: Pushing efforts while squatting or lying on her side.
  • Licking genitals: Frequent licking of the vulva.
  • Amniotic sac visible: A fluid-filled sac may appear at the vulva.

Emergency - Call Vet Immediately

  • Straining >30 minutes with no kitten: Possible obstruction or malpresentation.
  • >2 hours between kittens: Especially with visible straining.
  • Bright red bleeding: More than a few drops can signal hemorrhage.
  • Green discharge before first kitten: Placental separation before birth can put a kitten at risk.
  • Collapsed or unresponsive queen: Possible eclampsia, shock, or exhaustion.
  • Kitten stuck >5 minutes: Requires immediate veterinary guidance.

Queening

What to Expect During Cat Birth

Most cats give birth without assistance. Your job is to observe, time events, and know when to call the vet.

6-12 hours

Stage 1: Pre-Labor

The cervix dilates, contractions begin quietly, and the queen may pant, pace, or seek privacy. Your role is to keep the nest warm and quiet.

5-30 minutes per kitten

Stage 2: Active Birth

Strong contractions begin, the amniotic sac appears, and kittens are delivered. Time each kitten and count one placenta per kitten.

Several hours

Stage 3: Post-Birth

Kittens nurse, the queen cleans them, and mild discharge continues. Keep the room warm and minimize handling for the first 24 hours.

Emergency

When to Call the Vet During Birth

Keep your vet's emergency number written down and accessible before labor begins. Do not wait until an emergency to search for it.

Straining >30 minutes with no kitten
Possible obstruction or malpresentation.
>2 hours between kittens
Especially with visible straining.
Bright red bleeding
More than a few drops can signal hemorrhage.
Green discharge before first kitten
Placental separation before birth can put a kitten at risk.
Collapsed or unresponsive queen
Possible eclampsia, shock, or exhaustion.
Kitten stuck >5 minutes
Requires immediate veterinary guidance.

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Pregnancy timeline

Use the due-date window to plan monitoring, not to predict an exact birth hour

Feline pregnancy timing is usually discussed around a 63-65 day average, but real litters can arrive within a wider normal window. The calculator is most useful for organizing weekly milestones, supply preparation, and the point at which labor signs deserve urgent attention.

Result guide

How to read the pregnancy dates

Treat the due date as a planning center point. The week, day count, and milestone notes help you know what should be happening now and what to prepare before the queen becomes uncomfortable or starts nesting.

  • Known mating date gives the strongest estimate; an approximate date should be treated as a wider window.
  • Early pregnancy is often subtle, so appetite, behavior, and body change should be interpreted together.
  • Late pregnancy planning should include a quiet nesting area and emergency vet contact.
  • Active straining without a kitten, heavy bleeding, collapse, or severe distress is not a wait-and-see situation.

The range matters

A normal due window is more realistic than a single date because ovulation timing, mating uncertainty, and individual variation can shift delivery.

Milestones guide preparation

Weekly fetal development and maternal behavior notes help distinguish normal changes from signs that need a call to the clinic.

Labor signs need sorting

Nesting and restlessness can be normal near delivery, but prolonged straining, green discharge before a kitten, or weakness should escalate quickly.

Timeline decisions

Use the pregnancy week to decide what to prepare now

Pregnancy content is most useful when it turns dates into timely preparation. Early weeks, late pregnancy, and active labor require different attention, supplies, and escalation thresholds.

Early pregnancy

The priority is confirming date confidence, protecting nutrition, and avoiding unnecessary stress. Visible signs may still be limited.

Record whether the date is exact or approximate and plan routine veterinary guidance.

Final two weeks

Preparation should become practical: quiet nesting space, clean bedding, supplies, transport plan, and emergency contact details.

Finish the birth kit before nesting behavior becomes intense.

Labor concerns

Severe distress, heavy bleeding, prolonged unproductive straining, or weakness changes the page from planning to urgent escalation.

Contact a veterinarian immediately rather than waiting for the calculator date.

Weekly milestones

Review the week-by-week status as the queen moves through pregnancy.

Daily near term

Check appetite, nesting, discharge, and behavior daily in the final days.

Immediate escalation

Do not wait if urgent labor warning signs appear.

A practical countdown plan

1

Confirm the date basis

Record whether the calculator used a known mating date, an estimated mating date, or a known due date so uncertainty is visible.

2

Prepare before the final week

Set up the nesting space and birth kit before the last days, when the queen may want quiet and consistency.

3

Keep emergency criteria visible

Put urgent labor signs and clinic contacts somewhere easy to reach before labor begins.

FAQ

Frequently Asked Questions About Cat Pregnancy

How long are cats pregnant?

Cats are pregnant for approximately 63-65 days from conception. The normal range is about 58-72 days, with most cats giving birth between days 63-67. If your cat has not given birth by day 70, contact your veterinarian.

How do I calculate my cat's due date?

Add 63 days to the first mating date for the expected due date. Because cats can mate over several days, use the first mating date for the earliest likely due date and track the full normal birth window.

How can I tell if my cat is pregnant?

Early signs include pink enlarged nipples, increased appetite, slight weight gain, and behavior changes. A veterinarian can confirm pregnancy by ultrasound from around day 21, palpation around day 28, or X-ray from around day 45.

What are the signs of labor in cats?

Labor signs include nesting, reduced appetite, restlessness, vocalization, a rectal temperature drop below 37.8°C or 100°F, visible contractions, and active straining. Call a vet if straining lasts more than 30 minutes without a kitten.

How much should I feed my pregnant cat?

Most cats can eat normally early in pregnancy. From week 6 onward, gradually increase food, switch fully to kitten food, and offer smaller frequent meals or free-choice feeding. Late pregnancy and lactation can greatly increase calorie needs.

When should I take my pregnant cat to the vet?

Schedule confirmation around day 21-28, consider an X-ray to count kittens around day 45-49, and contact your vet immediately for abnormal discharge, distress, stalled labor, or no birth by day 70.