Cat Pregnancy Calculator

Enter the mating date. You get the due date for the kittens, the normal window and pregnancy check dates.

First day of mating, AI date, or day the male went in.

Add a name for the calendar (optional)

Based on 65 days, normal range 61 to 70 days.

Estimated due date

Sat, Mar 7, 2026

Normal window: Mar 3, 2026 to Mar 12, 2026

Today
Not bred yet
Days to go
65

Pregnancy calendar and key dates

Each date links to its source. Your vet may give different timing for your herd or pet.
DateDayWhat to do or expect
Jan 18, 202617Ultrasound can show fetal heartbeats (days 16 to 17) [source]
Jan 22, 202621Belly palpation by a vet is easiest (days 21 to 25) [source]
Jan 30, 202629Relaxin blood test is reliable from this day [source]
Mar 3, 202661Normal queening window opens: have pens, bedding and supplies ready [source]
Mar 7, 202665Estimated due date [source]
Mar 12, 202670Normal window closes: call your vet if no birth [source]
Mar 13, 202671No labor signs yet: see your vet now [source]

Check with your vet. This is an estimate from average gestation lengths. Your vet can confirm the pregnancy, date it more closely, and tell you when to call for help at birth.

How long are cats pregnant?

A cat is pregnant for about 65 days, a little over nine weeks. A 2022 review in the Journal of Feline Medicine and Surgery gives a range of 57 to 72 days, with 95% to 97% of births between day 61 and day 70.

The Merck Veterinary Manual lists cats at 65 days. The feline review explains that pregnancy length varies from cat to cat, which can make problems hard to spot.

Cat gestation figures
SourceAverageRange
Ström Holst, JFMS 2022About 65 days57 to 72 days (most 61 to 70)
Merck Veterinary Manual65 daysNot given

How to use the cat due date calculator

Enter the date the queen mated. The tool adds 65 days for the due date and shows the 61 to 70 day window where most kittens are born. It also marks when your vet can confirm the pregnancy.

If she mated over several days, use the first one.

Cat due date formula

Due date equals mating date plus 65 days. A cat mated on January 1, 2026 is due about March 7, 2026, with most births between March 3 and March 12.

Due date = mating date + 65 days

When can a vet confirm a cat is pregnant?

Ultrasound can show the fetal heartbeat from day 16 to 17. Belly palpation is easiest on days 21 to 25. A relaxin blood test is reliable from day 29. The review advises a caesarean at day 71 if there are no signs of birth.

These figures come from the JFMS review. Your vet will choose the test that fits your cat.

Questions people ask

How many weeks is a cat pregnant?

About nine weeks. 65 days is nine weeks and two days.

Can I use this as a cat gestation calculator for any breed?

Yes. The review notes the length varies, but the 61 to 70 day window covers most births in all breeds studied.

When should I call the vet?

Call if she strains with no kitten, seems unwell, or reaches day 71 with no signs of labor.

Other animals

References

  1. Feline breeding and pregnancy management: What is normal and when to intervene. B. Ström Holst, Journal of Feline Medicine and Surgery, 2022 (PubMed Central).
  2. Approximate Gestation Periods (table). Merck Veterinary Manual.

Written and checked by the Gestation Calculator team against the sources above. Last updated . How we build these numbers.