Enter the date your cat mated and get her most likely due date, the normal birth range and a dated timeline of what happens each week. Add today’s date to see how far along she is.
Week 7: kitten skeletons now show on an X-ray.
| Day | Milestone | Date |
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An estimate, not veterinary advice. Runs in your browser; nothing you type is sent anywhere.
This cat pregnancy calculator is for cat owners and breeders who know, or can roughly guess, when their queen mated. It counts forward 63 to 65 days to the most likely kittening date, shows the wider normal range, and dates each milestone so you know when to book a vet check and set up a nest.
How Long Is a Cat Pregnant?
A cat is usually pregnant for about 63 to 65 days, or roughly 9 weeks, counted from mating. Normal births range from about day 58 to day 72. For example, a queen that mated on August 10, 2026 is most likely to have her kittens around October 12 to 14, 2026.
How Do You Calculate a Cat’s Due Date?
To calculate a cat’s due date, add 63 days to the mating date, then expect the kittens on that day or within the next two days. A pregnant female cat is called a queen, and the length of her pregnancy is called the gestation period.
usual window = mating date + 63 to 65 days
normal range = mating date + 58 to 72 days
Cats are induced ovulators: mating itself triggers the release of eggs, usually a day or two later. That is why the mating date is a good starting point. If she mated over several days, use the first date and treat the result as the early end of the window. The Merck Veterinary Manual gives 60 to 65 days, while the PDSA quotes 63 to 68 days, so a few days either way is normal.
What Happens Week by Week in Cat Pregnancy?
A cat pregnancy moves from invisible changes in the first two weeks to nesting in week 9.
| Week | Days | What happens |
|---|---|---|
| 1 to 2 | 0 to 13 | Fertilised eggs travel to the uterus. No visible signs. |
| 3 | 14 to 20 | Embryos implant at about day 14. Nipples start pinking up. |
| 4 to 5 | 21 to 34 | A vet can feel the kittens or see them on ultrasound. |
| 6 to 7 | 35 to 48 | Belly rounds out. Skeletons show on X-ray from about day 45. |
| 8 | 49 to 55 | Appetite rises. Many vets suggest moving her onto kitten food. |
| 9 | 56 to 65 | Nesting, restlessness, less appetite. Most births on day 63 to 65. |
| 10 | 66 to 72 | Late but often normal. Call the vet if nothing by day 72. |
Pinking up means the nipples become pinker and larger at about week 3. It is one of the first signs owners notice.
When Can a Vet Confirm a Cat Is Pregnant?
A vet can usually confirm a cat pregnancy about 21 to 30 days after mating. Palpation means gently feeling the belly for the small swellings of each kitten. An ultrasound scan in the same window can also pick up heartbeats. An X-ray works later, once the kittens’ bones harden after about day 45, and a late X-ray after about day 55 gives the most reliable kitten count. Weigh her each week, and use the cat age calculator if you are unsure how old she is, since very young and older queens need closer vet care.
When Should You Call the Vet During Cat Labour?
Call your vet if she strains hard for 20 to 30 minutes with no kitten, if there is green discharge with no kitten, or if no labour starts by about day 72. Kittening, also called queening, usually takes several hours, with kittens 10 to 60 minutes apart. Many households with cats also have dogs, and the puppy weight calculator and dog age calculator cover the same life stages for them.
Worked Example
Mia’s cat Luna mated on August 10, 2026. Mia enters that date and today’s date, September 21, 2026. The tool shows a most likely due date of October 12, 2026, with most kittens arriving October 12 to 14. The normal range runs from Oct 7 to Oct 21 (day 58 to 72). Luna is on day 42, week 7, with 21 days to go. The timeline puts the X-ray milestone on September 24, 2026 (day 45) and the kittening box on October 5, 2026 (day 56). If Luna had mated on November 15, 2026 instead, the due date would be January 17, 2027.
How Do You Use the Cat Pregnancy Calculator?
Enter the mating date
Pick the day your cat mated. If she mated over several days, use the first one.
Check today's date
Today's date fills in by itself. Change it to see any other day.
Read the due date
The big date is day 63. The line below gives the usual day 63 to 65 window.
Follow the timeline
The table dates each milestone, from pinking up to the day to call your vet.
Frequently Asked Questions
How many weeks is a cat pregnant?
A cat is pregnant for about 9 weeks. Most queens give birth 63 to 65 days after mating, which is just over 9 weeks. Births from about 58 days, a little over 8 weeks, to 72 days, just over 10 weeks, can still be normal.
Can I work out the due date without a mating date?
Only roughly. A vet can estimate the stage of pregnancy by ultrasound from about day 21, or by X-ray after day 45. Ask your vet for an estimated day, subtract it from the scan date, and enter that as the mating date.
How many kittens does a cat usually have?
Most litters have about 4 kittens, but anything from 1 to 8 or more happens. First litters and very young or older queens often have fewer. A late X-ray after about day 55 is the best way to count them before birth.
How can I tell if my cat is pregnant at home?
The first sign is usually pinking up at about 3 weeks, when the nipples turn pinker and larger. Weight gain and a rounder belly follow from about week 5. A vet visit at day 21 to 30 can confirm it.
Is it normal for a cat to go past 65 days?
Yes, up to a point. Many healthy queens give birth between day 66 and day 72. If she shows no signs of labour by about day 72, or seems unwell at any stage, call your vet the same day.
What should I feed a pregnant cat?
Feed a complete food and let her eat more as the pregnancy goes on. Many vets suggest moving her onto a kitten food from about week 6 to 8, as it has more energy and protein. Ask your vet before adding supplements.
Sources and Further Reading
- Merck Veterinary Manual: Management of Reproduction in Cats
- Merck Veterinary Manual: Pregnancy Determination in Dogs and Cats
- PDSA: Cat labour, a guide to giving birth
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Last reviewed: October 2026