Cat Pregnancy Calculator
Find your cat’s likely due date and queening window from the mating date, plus the milestones to plan for.
Don’t know the date? A vet can estimate how far along she is by feeling her belly, ultrasound or X-ray.
Estimated due date
Nov 8, 2026
Most queens give birth between Wed, Nov 4, 2026 and Fri, Nov 13, 2026 (days 61–70 after mating).
- Sep 25, 2026Day 21: “Pinking up”: nipples may turn pink and enlarge from about weeks 3–4
- Sep 29, 2026Day 25: A vet can usually confirm pregnancy by feeling the belly or ultrasound (about weeks 3–4)
- Oct 2, 2026Day 28: Switch gradually to kitten food; appetite rises through late pregnancy
- Oct 19, 2026Day 45: X-ray can count kittens from about day 45
- Oct 24, 2026Day 50: Set up a quiet, warm nesting box (at least 2 weeks before the due date)
- Nov 3, 2026Day 60: Watch for nesting, restlessness and loss of appetite; labor is close
Call your vet if she strains hard for 30–60 minutes with no kitten, or goes past day 70 with no labor.
How we calculate this: the formula, its sources and its limits
Quick answer
Cats are pregnant for about 63 to 65 days, roughly nine weeks. Count 65 days from the mating date for the most likely due date, and expect kittens anywhere from day 61 to day 70. If she mated on several days, count from the first date for the earliest and the last date for the latest.
How do I use the cat pregnancy calculator?
- Enter the date she mated. If you saw several matings, enter the first one.
- If she mated on more than one day, add the last date to widen the window.
- Read the estimated due date and the normal window, and plan to be around for the whole window.
- Use the milestone dates to book a vet check at about four weeks and to set up a nesting box in good time.
What formula does the cat pregnancy calculator use?
Normal window = first mating + 61 days to last mating + 70 days
Unlike dogs, cats are induced ovulators: mating itself triggers the hormone surge that releases eggs, usually within a day or two. So the mating date is a good stand-in for conception, and a cat’s due date is easier to predict from it than a dog’s. The 65-day average and the 61–70 day window come from a 2022 review in the Journal of Feline Medicine and Surgery, which found 95–97% of births in that range. VCA notes that most queens deliver on days 63–65.
How is the calculation done?
Using an example mating date:
- Start from the mating date: Mon, Mar 2, 2026.
- Add 65 days for the most likely due date: Wed, May 6, 2026.
- Add 61 days for the start of the normal window (Sat, May 2, 2026) and 70 days for the end (Mon, May 11, 2026).
- If she mated again three days later (Mar 5, 2026), the likely dates become May 6, 2026 to May 9, 2026 and the window stretches to Thu, May 14, 2026.
- Milestones count from the first mating: vet check from about day 25 (Mar 27, 2026), kitten food from about day 28 (Mar 30, 2026), nesting box by day 50 (Apr 21, 2026).
What happens in each week of a cat’s pregnancy?
| Week | What’s happening and what to do |
|---|---|
| Weeks 1–2 | Fertilization; embryos travel to the uterus. No visible signs, and she may still act as if in heat for a day or two. |
| Week 3 | Embryos implant. Nipples may start to “pink up” (turn rosy and enlarge). Some queens eat a little less or vomit briefly. |
| Week 4 | A vet can often feel the developing kittens or see them on ultrasound. Start moving her onto kitten food over a week. |
| Weeks 5–6 | Belly visibly rounds; appetite climbs. Offer several small meals a day. |
| Week 7 | Kitten skeletons show on X-ray from about day 45, so a vet can count them. |
| Week 8 | Set up a quiet, warm nesting box. Kittens may be felt moving. |
| Week 9 | Nesting, restlessness, loss of appetite and a drop in temperature mean labor is close. |
Cat gestation chart: mating date to due date
No calculator handy? Find the month she mated. The table assumes a mating on the 1st; for a later day, move every date forward by the same number of days.
| Mated on | Most likely due date (day 65) | Normal window (days 61–70) |
|---|---|---|
| Jan 1 | Mar 7 | Mar 3 to Mar 12 |
| Feb 1 | Apr 7 | Apr 3 to Apr 12 |
| Mar 1 | May 5 | May 1 to May 10 |
| Apr 1 | Jun 5 | Jun 1 to Jun 10 |
| May 1 | Jul 5 | Jul 1 to Jul 10 |
| Jun 1 | Aug 5 | Aug 1 to Aug 10 |
| Jul 1 | Sep 4 | Aug 31 to Sep 9 |
| Aug 1 | Oct 5 | Oct 1 to Oct 10 |
| Sep 1 | Nov 5 | Nov 1 to Nov 10 |
| Oct 1 | Dec 5 | Dec 1 to Dec 10 |
| Nov 1 | Jan 5 | Jan 1 to Jan 10 |
| Dec 1 | Feb 4 | Jan 31 to Feb 9 |
How much should a pregnant cat eat?
Her needs rise steadily through pregnancy, unlike a dog’s, which jump late. Move her onto a kitten (growth) food from about week four, offer small meals often, and expect her to eat up to about 50% more than usual by the end. While nursing she may need twice her normal amount or more. Our cat food calculator gives her normal daily portion as a starting point, and how much a kitten should eat covers the kittens once they start on solid food.
How long does a cat’s labor last?
The first stage (restlessness, nesting, panting, no visible pushing) usually lasts under two hours but can be longer in a first-time mother. Once she starts pushing, kittens typically arrive about 30 minutes apart, and 95% arrive within 100 minutes of the one before. The whole delivery usually takes under six hours. Leave her quiet, keep other pets away and watch from a distance.
What happens after the kittens are born?
Have a vet check the mother and kittens within a day or so, to make sure no kittens or placentas are left behind. Kittens should gain weight every day; weigh them on a kitchen scale. For how they grow from there, see when cats stop growing. A queen can come back into heat within a few weeks of giving birth, sometimes while still nursing, so talk to your vet about spaying if you don’t plan another litter.
Frequently asked questions
How long are cats pregnant?
About 63 to 65 days, or roughly nine weeks. Most queens give birth between day 61 and day 70 after mating, and studies report an average of about 65 days. Births before about day 60 are usually premature, and kittens born that early often don’t survive.
How can I tell if my cat is pregnant?
The first sign most owners notice is “pinking up”: the nipples turn pink and enlarge from about three weeks. Her belly rounds from about week five. A vet can usually confirm pregnancy from three to four weeks by feeling her belly or with ultrasound.
What if I don’t know when she mated?
Ask your vet to estimate how far along she is. Ultrasound measurements early in pregnancy, or an X-ray after about day 45, give a reasonable estimate. Then count back to an approximate mating date and enter that.
Can a cat get pregnant by more than one tom?
Yes. Cats can mate with several males during one heat, and a single litter can have more than one father. That’s also why the calculator lets you enter the first and last mating dates.
How many kittens will my cat have?
Four on average, though one to eight or more is possible. First litters and older queens tend to be smaller. An X-ray from about day 45 is the only reliable way to count them before birth.
When should I call the vet during labor?
Call if she strains hard for 30–60 minutes without producing a kitten, goes more than 2 hours between kittens while still straining, has green or bloody discharge before the first kitten, or passes day 70 with no sign of labor.
Sources
- VCA Animal Hospitals. Breeding and Queening Cats (most cats deliver between days 63 and 65; feeding during pregnancy). vcahospitals.com
- Little S, et al. Feline breeding and pregnancy management: what is normal and when to intervene. J Feline Med Surg 2022 (mean ≈65 days; 95–97% of births on days 61–70; labor timings). pmc.ncbi.nlm.nih.gov
- Root Kustritz MV. Clinical management of pregnancy in cats. Theriogenology 2006 (average 65.6 days, range 52–74; average litter 4). pmc.ncbi.nlm.nih.gov
- Cats Protection. Pregnant cats, birth and care of young kittens (pinking up from 3–4 weeks; nesting area 2 weeks before birth). cats.org.uk
- Merck Veterinary Manual. Whelping and Queening in Bitches and Queens (parturition 64–66 days from the mating-induced LH surge). merckvetmanual.com
Vet disclaimer: These are estimates for healthy pets. Your vet knows your pet. Ask them before changing diet or care, especially for puppies, kittens, seniors, pregnant pets or pets with health conditions. Read our medical disclaimer.