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Cat Pregnancy Calculator

Estimate when kittens may arrive and see what to prepare each week. If the mating date is unknown, start with the signs you have noticed.

When might the kittens arrive?

Enter the mating date if you know it. Otherwise, choose the signs you have noticed. Your vet can confirm pregnancy.

Starting point

If mating happened across several days, use the earliest observed date and treat the result as a planning range.

Urgent symptoms? Check labor and distress warning signs Any one may need emergency veterinary help
Choose every sign you can see

If any apply, contact an emergency veterinarian now. Do not wait for a result to get help.

See the due window and what to prepare this week.

What your vet can confirm

This tool cannot confirm pregnancy, fetal viability, litter size, or whether labor is progressing normally.

Your week-by-week guide

Enter a mating date for calendar dates, or choose visible observations to highlight a broad possible stage.

  1. Days 0–6

    Usually too early to see

    Visible changes are unlikely, and mating does not guarantee pregnancy.

    What to do

    Record any known mating dates and keep normal routines steady.

  2. Days 7–13

    Home signs remain unreliable

    Most cats still show no dependable outward pregnancy signs.

    What to do

    Avoid starting supplements or medications without veterinary guidance.

  3. Days 14–20

    Early visible clues may begin

    Nipples may look pinker or more prominent, but this is not proof of pregnancy.

    What to do

    Plan a veterinary confirmation visit instead of checking the abdomen yourself.

  4. Days 21–27

    A useful confirmation window

    A veterinarian may be able to confirm pregnancy by examination or ultrasound.

    What to do

    Ask about pregnancy confirmation, health screening, and a feeding plan.

  5. Days 28–34

    Growth begins to show

    Appetite and body shape may start changing, though individual cats vary.

    What to do

    Discuss a complete kitten or growth diet; do not add calcium on your own.

  6. Days 35–41

    The abdomen may look fuller

    A more rounded abdomen and gradual weight gain may become noticeable.

    What to do

    Keep her indoors, reduce exposure to unfamiliar cats, and monitor appetite and energy.

  7. Days 42–48

    Late-pregnancy planning

    Fetal skeletons are becoming visible on radiographs, and body changes are clearer.

    What to do

    Ask your veterinarian whether late-pregnancy imaging or litter-size planning is appropriate.

  8. Days 49–55

    Prepare a quiet nest

    Visible movement or nesting behavior may appear during the later weeks.

    What to do

    Set up a warm, private, observable nesting area and save emergency vet details.

  9. Days 56–67

    The due window approaches

    Labor may be near, but timing varies and the breeding date may not equal conception date.

    What to do

    Observe calmly, know the urgent warning signs, and contact a veterinarian if the expected window passes.

Next steps

Put the result into practice.

Prepare for kittens

Understand the timing, estimate a due window, and get the room ready.

A few common questions

Can visible signs tell me exactly how far along a cat is?

No. Visible signs overlap, appear at different times, and can have causes other than pregnancy. The unknown-date mode only suggests a broad possible stage with low confidence.

What due window does it use?

It uses a broad 60 to 67 day window and highlights the common 63 to 65 day average range.

Can this tool confirm pregnancy or count kittens?

No. Pregnancy, fetal viability, gestational age, and litter size need veterinary examination or imaging.

What should I do if I see a warning sign?

Fresh or heavy bleeding, dark discharge before the first kitten, collapse, labored breathing, severe distress, strong straining without progress, or a stuck kitten needs urgent veterinary help.

About this tool & sources

Your cat's health and history can change what is right for them. Use these results to support a conversation with your veterinarian. They cannot confirm a diagnosis or prescribe treatment.

Updated 2026-10-05

How this tool works

A recorded mating date provides a planning window. Visible signs cannot confirm pregnancy or establish a dependable due date.

View rules and sources

  1. Planning window

    Reference + site choice

    Mating date +60 to +67 days; central window +63 to +65 days.

    VCA publishes these ranges. Using a mating date as day zero is a planning approximation; the breeding and conception dates can differ.

  2. Date-based stages

    Site estimate or rule

    Early days 0–20; middle 21–40; late 41–59; due 60–67; beyond after 67.

    The labels and boundaries are site planning bins, not clinically confirmed stages.

  3. Weekly timeline

    Reference + site choice

    Weeks 1–8 use seven-day bins from day 0; week 9 covers days 56–67.

    The weekly layout is editorial. Confirmation and radiograph timing depend on technique and the individual cat; a week-7 imaging note is not a guarantee that a litter can be counted.

  4. Veterinary confirmation reference

    Published value

    The cited ultrasound window is 25–35 days of gestation.

    This window concerns veterinary ultrasound. A calendar based on mating cannot establish the true gestational day or confirm pregnancy.

  5. Calendar reminders

    Reference + site choice

    Confirmation reminder day 25; calendar span days 25–35. Prepare nest day 49. Due event days 60–67.

    These reminders are site choices within a broad care timeline. Calendar end dates are exclusive; no clinical confirmation is performed.

  6. Visible clue bins

    Site estimate or rule

    Pink nipples from week 3; rounded abdomen 6; movement or nesting 7; milk/full mammary glands 8.

    These exact minimum weeks are site estimates. Nesting and mammary changes can overlap with other conditions; the checked source does not validate this reverse-dating scheme.

  7. Unknown-date estimate

    Site estimate or rule

    Use the latest minimum week among selected clues, show possible weeks through 9. One clue: very low confidence; two or more: low.

    This site logic is not a probability model and cannot confirm pregnancy, fetal viability or a due date.

  8. Urgent signs override timing

    Reference + site choice

    Straining without progress, a stuck kitten, fresh/heavy bleeding, abnormal discharge, collapse/breathing trouble or severe distress prompt an emergency call.

    The sources support urgent assessment of delivery problems and severe signs. This site's checklist deliberately has no wait-time threshold; it does not diagnose difficult labor.

Published values support the stated reference scope. They do not establish the accuracy or clinical validity of this tool.

Sources checked · No professional review recorded. Source checking is a record of reading, not a clinical review.