Cat Pregnancy Calculator

March 2024
A cat that bred on 4 Mar 2024 has an approximate due date of

Tuesday, May 7, 2024

However, the due date could fall anywhere between 1 May and 10 May. Learn more about the Key Gestation Milestones.

Disclaimer: We've spent hundreds of hours building and testing our calculators and conversion tools. However, we cannot be held liable for any damages or losses (monetary or otherwise) arising out of or in connection with their use. Full disclaimer.

Feline Gestation Milestones

Here's a detailed table describing the weekly milestones during a cat's pregnancy. Keep in mind that individual variations can occur, but this table provides a general guideline:

WeekDatesMilestones and Changes
Week 14 Mar to 11 MarConception - Fertilization occurs. The queen (female cat) may have a slight increase in appetite. No visible physical changes.
Week 212 Mar to 18 MarEmbryo Development - Embryos begin to form. The queen might show more affectionate behavior. Still, no significant physical changes.
Week 319 Mar to 25 MarNidation - Implantation of embryos in the uterus. Nipples may start to become more pronounced and pinker - this is known as 'pinking up'.
Week 426 Mar to 1 AprFetal Development - Fetal growth starts. The queen may begin to gain weight. A vet can typically confirm pregnancy through palpation around this time.
Week 52 Apr to 8 AprVisible Changes - The abdomen starts to swell. Increased appetite in the queen. It's possible to detect fetal movement upon careful palpation.
Week 69 Apr to 15 AprRapid Growth - Fetal development is rapid. The queen's abdomen is noticeably larger. She might start nesting behaviors.
Week 716 Apr to 22 AprPreparation for Birth - The queen's nipples may enlarge as mammary glands develop. Nesting behavior becomes more pronounced. Decrease in physical activity.
Week 823 Apr to 29 AprFinal Stage - The queen's abdomen is large and she may start to look for a birthing place. Decreased appetite and restlessness can be common.
Week 9 (up to Day 67)30 Apr to 7 MayDelivery Imminent - Look for signs of labor, such as restlessness, vocalizing, and possible loss of appetite. The queen may start labor within 24-48 hours when her body temperature drops.

How Do You Calculate a Cat's Due Date?

3 striped kittens sitting in a meadow looking at something behind the camera

To calculate a cat's due date, you can follow these steps:

  1. Determine the Date of Conception: This is the starting point for your calculation. If you know the exact date of mating, use that date. If not, use the earliest possible date of conception if there was a known mating period.
  2. Understand the Average Gestation Period: The average gestation period for cats is about 63 to 65 days, but it can range from 58 to 67 days.
  3. Add the Gestation Period to the Conception Date: To calculate the due date, simply add 63 to 65 days to the date of conception. This will give you a rough estimate of when the cat might give birth.

    For example, if the conception date is April 1st:

    • Adding 63 days to April 1st gives you June 3rd.
    • Adding 65 days to April 1st gives you June 5th.

    So, the estimated due date would be between June 3rd and June 5th.

  4. Consider Variations: Remember that the due date is an estimate. Some cats may deliver a few days before or after the calculated due date.

Factors That Affect Cat Pregnancy Length

FactorPotential Impact on Pregnancy LengthNotes
Cat's AgeYoung or very old cats may have slightly shorter or longer pregnancies.First-time mothers and senior cats might experience variations.
Health & NutritionPoor health or nutrition can lead to prolonged or early labor.Balanced diet and good health can promote a normal gestation period.
Breed SizeGenerally, no significant impact, but larger breeds might have slightly longer pregnancies.Most cat breeds have similar gestation periods.
Litter SizeLarger litters may lead to slightly earlier deliveries.More kittens can mean less space and resources, prompting earlier birth.
Stress LevelsHigh stress can cause early labor.A calm, safe environment is crucial for a full-term pregnancy.
Genetic FactorsGenetic makeup can subtly influence gestation length.This is more individual to the cat and not well-documented.
Environmental ConditionsPoor environmental conditions can lead to early labor.Comfortable living conditions are important for a healthy pregnancy.
Medical ConditionsCertain health issues can lead to premature or delayed labor.Conditions like feline diabetes or hypertension might affect pregnancy length.

It's important to understand that these factors can have varying degrees of impact, and not all will necessarily result in a significant change in gestation length. Monitoring and veterinary care are crucial to ensure a healthy pregnancy for your cat.

Cat Pregnancy Reference Table

Below is a reference table showing the due date for all days of the year.

Date BredDue Date Date BredDue Date Date BredDue Date Date BredDue Date Date BredDue Date Date BredDue Date Date BredDue Date Date BredDue Date Date BredDue Date Date BredDue Date Date BredDue Date Date BredDue Date
1 Jan5 Mar1 Feb5 Apr1 Mar4 May1 Apr4 Jun1 May4 Jul1 Jun4 Aug1 Jul3 Sep1 Aug4 Oct1 Sep4 Nov1 Oct4 Dec1 Nov4 Jan1 Dec3 Feb
2 Jan6 Mar2 Feb6 Apr2 Mar5 May2 Apr5 Jun2 May5 Jul2 Jun5 Aug2 Jul4 Sep2 Aug5 Oct2 Sep5 Nov2 Oct5 Dec2 Nov5 Jan2 Dec4 Feb
3 Jan7 Mar3 Feb7 Apr3 Mar6 May3 Apr6 Jun3 May6 Jul3 Jun6 Aug3 Jul5 Sep3 Aug6 Oct3 Sep6 Nov3 Oct6 Dec3 Nov6 Jan3 Dec5 Feb
4 Jan8 Mar4 Feb8 Apr4 Mar7 May4 Apr7 Jun4 May7 Jul4 Jun7 Aug4 Jul6 Sep4 Aug7 Oct4 Sep7 Nov4 Oct7 Dec4 Nov7 Jan4 Dec6 Feb
5 Jan9 Mar5 Feb9 Apr5 Mar8 May5 Apr8 Jun5 May8 Jul5 Jun8 Aug5 Jul7 Sep5 Aug8 Oct5 Sep8 Nov5 Oct8 Dec5 Nov8 Jan5 Dec7 Feb
6 Jan10 Mar6 Feb10 Apr6 Mar9 May6 Apr9 Jun6 May9 Jul6 Jun9 Aug6 Jul8 Sep6 Aug9 Oct6 Sep9 Nov6 Oct9 Dec6 Nov9 Jan6 Dec8 Feb
7 Jan11 Mar7 Feb11 Apr7 Mar10 May7 Apr10 Jun7 May10 Jul7 Jun10 Aug7 Jul9 Sep7 Aug10 Oct7 Sep10 Nov7 Oct10 Dec7 Nov10 Jan7 Dec9 Feb
8 Jan12 Mar8 Feb12 Apr8 Mar11 May8 Apr11 Jun8 May11 Jul8 Jun11 Aug8 Jul10 Sep8 Aug11 Oct8 Sep11 Nov8 Oct11 Dec8 Nov11 Jan8 Dec10 Feb
9 Jan13 Mar9 Feb13 Apr9 Mar12 May9 Apr12 Jun9 May12 Jul9 Jun12 Aug9 Jul11 Sep9 Aug12 Oct9 Sep12 Nov9 Oct12 Dec9 Nov12 Jan9 Dec11 Feb
10 Jan14 Mar10 Feb14 Apr10 Mar13 May10 Apr13 Jun10 May13 Jul10 Jun13 Aug10 Jul12 Sep10 Aug13 Oct10 Sep13 Nov10 Oct13 Dec10 Nov13 Jan10 Dec12 Feb
11 Jan15 Mar11 Feb15 Apr11 Mar14 May11 Apr14 Jun11 May14 Jul11 Jun14 Aug11 Jul13 Sep11 Aug14 Oct11 Sep14 Nov11 Oct14 Dec11 Nov14 Jan11 Dec13 Feb
12 Jan16 Mar12 Feb16 Apr12 Mar15 May12 Apr15 Jun12 May15 Jul12 Jun15 Aug12 Jul14 Sep12 Aug15 Oct12 Sep15 Nov12 Oct15 Dec12 Nov15 Jan12 Dec14 Feb
13 Jan17 Mar13 Feb17 Apr13 Mar16 May13 Apr16 Jun13 May16 Jul13 Jun16 Aug13 Jul15 Sep13 Aug16 Oct13 Sep16 Nov13 Oct16 Dec13 Nov16 Jan13 Dec15 Feb
14 Jan18 Mar14 Feb18 Apr14 Mar17 May14 Apr17 Jun14 May17 Jul14 Jun17 Aug14 Jul16 Sep14 Aug17 Oct14 Sep17 Nov14 Oct17 Dec14 Nov17 Jan14 Dec16 Feb
15 Jan19 Mar15 Feb19 Apr15 Mar18 May15 Apr18 Jun15 May18 Jul15 Jun18 Aug15 Jul17 Sep15 Aug18 Oct15 Sep18 Nov15 Oct18 Dec15 Nov18 Jan15 Dec17 Feb
16 Jan20 Mar16 Feb20 Apr16 Mar19 May16 Apr19 Jun16 May19 Jul16 Jun19 Aug16 Jul18 Sep16 Aug19 Oct16 Sep19 Nov16 Oct19 Dec16 Nov19 Jan16 Dec18 Feb
17 Jan21 Mar17 Feb21 Apr17 Mar20 May17 Apr20 Jun17 May20 Jul17 Jun20 Aug17 Jul19 Sep17 Aug20 Oct17 Sep20 Nov17 Oct20 Dec17 Nov20 Jan17 Dec19 Feb
18 Jan22 Mar18 Feb22 Apr18 Mar21 May18 Apr21 Jun18 May21 Jul18 Jun21 Aug18 Jul20 Sep18 Aug21 Oct18 Sep21 Nov18 Oct21 Dec18 Nov21 Jan18 Dec20 Feb
19 Jan23 Mar19 Feb23 Apr19 Mar22 May19 Apr22 Jun19 May22 Jul19 Jun22 Aug19 Jul21 Sep19 Aug22 Oct19 Sep22 Nov19 Oct22 Dec19 Nov22 Jan19 Dec21 Feb
20 Jan24 Mar20 Feb24 Apr20 Mar23 May20 Apr23 Jun20 May23 Jul20 Jun23 Aug20 Jul22 Sep20 Aug23 Oct20 Sep23 Nov20 Oct23 Dec20 Nov23 Jan20 Dec22 Feb
21 Jan25 Mar21 Feb25 Apr21 Mar24 May21 Apr24 Jun21 May24 Jul21 Jun24 Aug21 Jul23 Sep21 Aug24 Oct21 Sep24 Nov21 Oct24 Dec21 Nov24 Jan21 Dec23 Feb
22 Jan26 Mar22 Feb26 Apr22 Mar25 May22 Apr25 Jun22 May25 Jul22 Jun25 Aug22 Jul24 Sep22 Aug25 Oct22 Sep25 Nov22 Oct25 Dec22 Nov25 Jan22 Dec24 Feb
23 Jan27 Mar23 Feb27 Apr23 Mar26 May23 Apr26 Jun23 May26 Jul23 Jun26 Aug23 Jul25 Sep23 Aug26 Oct23 Sep26 Nov23 Oct26 Dec23 Nov26 Jan23 Dec25 Feb
24 Jan28 Mar24 Feb28 Apr24 Mar27 May24 Apr27 Jun24 May27 Jul24 Jun27 Aug24 Jul26 Sep24 Aug27 Oct24 Sep27 Nov24 Oct27 Dec24 Nov27 Jan24 Dec26 Feb
25 Jan29 Mar25 Feb29 Apr25 Mar28 May25 Apr28 Jun25 May28 Jul25 Jun28 Aug25 Jul27 Sep25 Aug28 Oct25 Sep28 Nov25 Oct28 Dec25 Nov28 Jan25 Dec27 Feb
26 Jan30 Mar26 Feb30 Apr26 Mar29 May26 Apr29 Jun26 May29 Jul26 Jun29 Aug26 Jul28 Sep26 Aug29 Oct26 Sep29 Nov26 Oct29 Dec26 Nov29 Jan26 Dec28 Feb
27 Jan31 Mar27 Feb1 May27 Mar30 May27 Apr30 Jun27 May30 Jul27 Jun30 Aug27 Jul29 Sep27 Aug30 Oct27 Sep30 Nov27 Oct30 Dec27 Nov30 Jan27 Dec1 Mar
28 Jan1 Apr28 Feb2 May28 Mar31 May28 Apr1 Jul28 May31 Jul28 Jun31 Aug28 Jul30 Sep28 Aug31 Oct28 Sep1 Dec28 Oct31 Dec28 Nov31 Jan28 Dec2 Mar
29 Jan2 Apr29 Mar1 Jun29 Apr2 Jul29 May1 Aug29 Jun1 Sep29 Jul1 Oct29 Aug1 Nov29 Sep2 Dec29 Oct1 Jan29 Nov1 Feb29 Dec3 Mar
30 Jan3 Apr30 Mar2 Jun30 Apr3 Jul30 May2 Aug30 Jun2 Sep30 Jul2 Oct30 Aug2 Nov30 Sep3 Dec30 Oct2 Jan30 Nov2 Feb30 Dec4 Mar
31 Jan4 Apr31 Mar3 Jun31 May3 Aug31 Jul3 Oct31 Aug3 Nov31 Oct3 Jan31 Dec5 Mar