Cat Pregnancy Calculator

She mated. Now what?

The cat pregnancy calculator takes one input — the mating date — and gives you the estimated due date instantly. No calendar counting, no guesswork, no anxiety about getting the date wrong.

Enter the mating date. Get the due date. Start preparing.

How Long Is Cat Pregnancy?

A cat's pregnancy lasts approximately 63–65 days from mating — roughly nine weeks from conception to birth.

Key facts:

• Standard average: 63–65 days from mating

• Earliest signs: Visible around Week 3 ("pinking up" of nipples)

• Small or young cats — may deliver slightly earlier

• Older or larger cats — may go slightly longer

• Veterinary confirmation — possible via ultrasound as early as Day 15–17

The Cat Pregnancy Formula

Due Date = Mating Date + 63 days

Delivery Window

Earliest likely delivery: Mating Date + 61 days Average delivery: Mating Date + 63–65 days Latest safe delivery: Mating Date + 67 days

If your cat hasn't delivered by Day 67–68, contact your veterinarian immediately.

How to Use the Cat Pregnancy Calculator

Inputs

• Mating date — enter the date of mating in DD/MM/YYYY format or use the calendar picker

Output

• Due date — automatically calculated and displayed in DD/MM/YYYY format

Enter the mating date and the estimated kittening date appears instantly — based on the standard 63-day feline gestation period.How to Calculate Cat Pregnancy Due Date — Step by Step

Example 1 — Mating Date: 1st February 2025

1. Mating date = 01/02/2025

2. Add 63 days

3. Due date = 5th April 2025

Delivery Window for Example 1

• Earliest: 01/02 + 61 days = 3rd April 2025

• Average: 01/02 + 63 days = 5th April 2025

• Latest safe: 01/02 + 67 days = 9th April 2025

Example 2 — Mating Date: 10th March 2025

1. Mating date = 10/03/2025

2. Add 63 days

3. Due date = 11th May 2025

Cat Pregnancy Stages — Week by Week

Early Stage — Weeks 1–3 (Days 1–21)

• No visible external signs initially

• Around Day 15–18: "Pinking up" — nipples become darker, swollen, and more prominent

• Temporary morning sickness may occur

• Increased affection and clinginess toward owner

• Veterinary ultrasound can confirm pregnancy from Day 15–17

Middle Stage — Weeks 4–6 (Days 22–42)

• Increased appetite — she may eat noticeably more

• Visible weight gain — belly begins to round and swell

• Abdominal palpation by a vet possible from Day 20–30 to confirm pregnancy

• Energy levels may decrease slightly

• Switch to high-quality kitten food around Week 4–5 to support growing kittens

Late Stage — Weeks 7–9 (Days 43–65)

• Nesting behavior begins — seeking quiet, warm, private areas

• Belly is noticeably large and kittens may be felt moving

• X-rays possible from around Day 45 to count kittens

• Decreased appetite in the final days before labor

• Irritability and restlessness increase significantly

• Temperature drop below 37.8°C (100°F) signals labor within 24 hours

Cat Pregnancy Milestones — Quick Reference Table

Caring for a Pregnant Cat

Nutrition

• Switch to nutrient-dense kitten food around Week 4–5 — it's higher in protein, calories, and essential nutrients needed for fetal development

• Provide multiple small meals throughout the day as belly size reduces stomach capacity

• Always ensure fresh water is available

• Never put a pregnant cat on a diet without veterinary advice

Veterinary Care

• Schedule a checkup to confirm pregnancy via ultrasound (Day 15–17) or abdominal palpation (Day 20–30)

• Discuss deworming and flea treatment safe for pregnancy

• Avoid vaccinations, unnecessary medications, or x-rays in early pregnancy

Nesting Preparation

• Provide a nesting box — a cardboard box lined with soft bedding works perfectly

• Place it in a quiet, warm, private area she can access freely

• Introduce the nesting box at least two weeks before the due date

• Avoid handling her belly as the due date approaches — it can cause distress or harm to kittens

Labor and Birth — What to Expect

Signs Labor Is Starting

• Restlessness and frequent position changing

• Vocalization (crying or howling)

• Panting and hiding

• Visible abdominal contractions

• Body temperature drops below 37.8°C

Three Stages of Labor

1. Stage 1 — Uterine contractions: 6–12 hours of contractions without visible straining

2. Stage 2 — Kitten delivery: Each kitten delivered over 4–12 hours total, typically 15–60 minutes apart

3. Stage 3 — Placental delivery: Placenta delivered after each kitten

Warning Signs — Call Your Vet Immediately If:

• Labor lasts over 24 hours without delivering a kitten

• Straining continues for 30+ minutes without producing a kitten

• There is excessive bleeding or unusual discharge

• A kitten appears stuck in the birth canal

• Your cat becomes unresponsive or extremely distressed

Similar Animal Pregnancy Calculators

If you found this calculator helpful, explore these related pregnancy calculators for other animals:

• Dog Pregnancy Calculator — 63-day gestation

• Cow Pregnancy Calculator — 283-day gestation

• Goat Pregnancy Calculator — 150-day gestation

• Horse Pregnancy Calculator — 340-day gestation

• Sheep Pregnancy Calculator — 147-day gestation

Fun Fact That'll Make You Laugh 😄

A cat can be pregnant with kittens from multiple different fathers in the same litter — a phenomenon called superfecundation.

This means if your cat mated with more than one male during her heat cycle, different kittens in the same litter can have completely different fathers.

One litter. Four kittens. Four dads. Your cat just out-complicated a daytime TV drama — and did it in 63 days. 😂

Frequently Asked Questions

What is the 3-3-3 rule for kittens?

The 3-3-3 rule describes kitten adjustment stages after adoption: 3 days to decompress and feel safe, 3 weeks to learn the household routine and start showing their personality, and 3 months to fully settle in and feel at home. It's a guideline for new kitten owners to set realistic expectations for how long adjustment takes.

What are the first signs of a pregnant cat?

The earliest reliable sign is "pinking up" — nipples becoming darker, swollen, and more prominent around Days 15–18. Other early signs include increased affection, temporary morning sickness, and slightly reduced energy. A veterinarian can confirm pregnancy via ultrasound as early as Day 15–17 of gestation.

How long is cat pregnancy in weeks?

Cat pregnancy lasts approximately 9 weeks — or 63–65 days from mating to delivery. Week 3 brings the first visible signs, Week 5–6 shows a noticeably rounded belly, and Weeks 7–9 are the final preparation and delivery window.

Can cats sense pregnancy?

Yes — cats can often detect human pregnancy. They are highly sensitive to changes in body chemistry, scent, hormones, and routine. Many cat owners report their cats becoming more affectionate, clingy, or protective during pregnancy. While not scientifically proven as a deliberate detection, cats clearly respond to the physiological and behavioral changes pregnancy brings.

How to use the cat pregnancy calculator?

Enter your cat's mating date in DD/MM/YYYY format using the date field or calendar picker. The calculator automatically adds 63 days and displays the estimated due date instantly. Use the delivery window of 61–67 days from mating as your full preparation range — and consult your veterinarian for professional confirmation.