Cat Pregnancy Calculator

The cat pregnancy calculator will compute the due date of your favorite feline.

Last updated: January 3, 2026

CreatorFrank Zhao

Mating date

More info

Due date

More info

1Due date

D = M + 63

2Earliest and latest delivery dates

E = M + 58

L = M + 71

3Days until due date

\Delta = D - C

MMating date

DDue date

EEarliest due

LLatest due

CCurrent date

\Delta

Days difference

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Quick Navigation

Cats can be surprisingly subtle about pregnancy. This guide explains how the calculator estimates a due date, how to interpret the range of possible delivery dates, and what to do if you’re not sure about the mating day.

→How to calculate my cat’s due date?
→How to use the cat pregnancy calculator?
→How many days is a cat pregnant?
→How to tell how far along your cat is?
→Still hungry for knowledge?
→Can you feel kittens in a pregnant cat?
→FAQs
→Limitations & sources

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How to calculate my cat’s due date?

At its core, the calculator uses an average gestation length. If $M$ is the mating date and $D$ is the estimated due date, the model is:

Basic estimate

D = M + 63\ \text{days}

Real life is less precise than a formula, so we also show a practical window (earliest to latest) around the estimate.

Typical range the calculator uses:

Earliest: $E = M + 58\ \text{days}$
Latest: $L = M + 71\ \text{days}$

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If you’re unsure about the mating date, try entering the veterinarian’s estimated due date instead. This calculator works both ways.

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How to use the cat pregnancy calculator?

You can use this calculator in two equally valid ways: start from a known mating date, or start from an estimated due date and work backwards.

Enter a date

Type a mating date (or use the calendar). If you already have a vet estimate, enter it in the due date field instead.

Read the highlighted result

The calculator highlights the derived field (blue) so you can tell which date was computed.

Use the delivery window

Plan around the earliest and latest dates, not only the single-day estimate.

(Example) Mating date → due date

Suppose your cat mated on January 3, 2026.

D

=

M + 63\ \text{days}

=

\text{Jan\ 3,\ 2026} + 63\ \text{days}

=

\text{Mar\ 7,\ 2026}

Earliest

E = \text{Jan\ 3,\ 2026} + 58\ \text{days}

= \text{Mar\ 2,\ 2026}

Latest

L = \text{Jan\ 3,\ 2026} + 71\ \text{days}

= \text{Mar\ 15,\ 2026}

Use the estimate for planning, and the window for preparedness.

📅

How many days is a cat pregnant?

Most domestic cats are pregnant for about 63 days on average. But the healthy delivery window is broader, which is why the calculator shows a range.

Quick conversions

Here are a few ways to think about $63\ \text{days}$ :

$63\ \text{days} = 9\ \text{weeks}$ (since $63/7 = 9$ )
$63\ \text{days} \approx 2.07\ \text{months}$
$63\ \text{days} = 1512\ \text{hours}$ (since $63\cdot 24 = 1512$ )

Why a range matters

Even if you know the mating day, biology varies. Litter size, the queen’s health, and simple natural variation can shift timing.

Practical planning tip: prepare the nesting area a few days before $D$ , but stay ready across $[E,\ L]$ .

🔎

How to tell how far along your cat is?

The most reliable method is veterinary evaluation. If you’re estimating at home, it’s better to combine what you observe with a date-based estimate rather than guessing from a single symptom.

If you know the mating date, a simple progress estimate is:

P

=

C - M

\ \text{(in days)}

,\ \ \ \text{weeks} = \frac{P}{7}

Here $C$ is today’s date (at midnight, UTC) and $P$ is the number of days since mating.

Common home observations

Nipple changes can show up around $\approx 15\text{–}18\ \text{days}$ .
Abdomen size and weight changes may become more noticeable after $\approx 2\text{–}3\ \text{weeks}$ .
Behavior and appetite can change, but these signs are non-specific.

When to call a vet

If you see lethargy, heavy bleeding, severe vomiting, or if your cat appears unwell, treat it as urgent. Also, a growing belly can have causes unrelated to pregnancy.

This calculator is for planning and learning — it doesn’t replace veterinary care.

📖

Still hungry for knowledge?

If you’re building a complete picture (nutrition, weight changes, day counting), pairing tools can help. Here are a few site-friendly options that usually complement pregnancy planning.

Age & day counting

Need exact day differences between two dates? Our Age Calculator is a handy companion.

Planning timelines

If you keep a “care timeline” spreadsheet, you can use the due date window from this calculator as your anchor.

Related calculators

Check the “Related Calculators” section below for other biology tools on this site.

🐾

Can you feel kittens in a pregnant cat?

It’s tempting to “check by touch,” but pressing on a pregnant cat’s abdomen is not a good idea. If you’re worried, a vet can evaluate pregnancy safely.

💡

Practical tip:

If you’re tracking progress at home, focus on gentle observation (appetite, behavior, nesting) and date-based planning instead of palpation.

❓

FAQs

How long are cats pregnant?

A common average is $63\ \text{days}$ , with a typical healthy range of roughly $58\text{–}71\ \text{days}$ .

Can I use this for specific breeds?

In many cases, the same baseline ( $63\ \text{days}$ ) is used for domestic cats. If you’re dealing with a high-risk pregnancy or your vet gives a different estimate, prefer the veterinary timeline.

What if I only know the due date?

Enter the due date and the calculator will estimate the mating date using $M = D - 63\ \text{days}$ .

Why do I see a delivery “window” instead of one exact date?

The estimate is a midpoint. The window reflects natural variation, so planning across $[E,\ L]$ is more realistic than relying on a single day.

How do I estimate “days pregnant” from a date?

If you know mating day $M$ , compute $P = C - M$ where $C$ is today.

Is this calculator medical advice?

No. It’s an educational planning tool. For health decisions and birth complications, consult a veterinarian.

⚠️

Limitations / disclaimers / sources

This calculator uses a simple timing model. Actual pregnancy length can vary, and dating can be uncertain when mating is unobserved.

Limitations

Not a diagnostic tool (pregnancy confirmation requires veterinary methods).
Uses typical averages and ranges; individual outcomes vary.
Date math uses $\text{UTC}$ midnights to reduce time-zone “off-by-one day” issues.

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