Cat Pregnancy Due Date Calculator
A cat's pregnancy (gestation) lasts about 63 to 65 days from mating, with a normal range of roughly 60 to 70 days. This calculator adds an editable gestation length (default 65 days) to the mating date to estimate the queening, or birth, date, and shows an early-to-late window to reflect natural variation. Enter the mating date and adjust the gestation length if your veterinarian has given you a different figure. Treat the result as a planning guide: a veterinarian can confirm pregnancy and stage more precisely with ultrasound or radiography. Always have veterinary contact details ready as the due date approaches.
Typical central value; normal range about 60 to 70 days.
Due date formula
Due date = mating date + gestation length (days)
Earliest = mating date + 60 days
Latest = mating date + 70 days
Days from today = due date - today
Dates are computed by adding whole days to the mating date. The earliest and latest bounds use the normal feline gestation range of 60 to 70 days.
Feline pregnancy context
- Feline gestation centres on about 63 to 65 days from mating.
- Conception date is rarely exact, so a window is more realistic than a single day.
- Ultrasound from around day 16 to 21 can confirm pregnancy.
- Fetal skeletons become visible on radiographs from around day 40 to 45.
- Have your veterinarian's number ready as the due window approaches.
Cat pregnancy: frequently asked questions
How long is a cat's pregnancy?
Feline gestation typically lasts about 63 to 65 days from mating, with a normal range of roughly 60 to 70 days. This calculator uses an editable gestation length defaulting to 65 days, then adds it to the mating date to estimate the queening (birth) date.
Why is the estimate a range rather than one exact day?
Cats can mate over several days and ovulation timing varies, so the true conception date is rarely known precisely. Healthy litters arrive anywhere from about 60 to 70 days. The calculator shows an early and late bound around the central estimate to reflect that natural variation.
What are signs that queening is near?
In the final days a queen may seek a nesting spot, reduce appetite, become restless, and show a drop in body temperature shortly before labour. Always have your veterinarian's contact details ready, as feline labour can occasionally have complications.
Can I rely on this date for veterinary planning?
Use it as a planning guide only. A veterinarian can confirm pregnancy and estimate stage more precisely with ultrasound (from around day 16 to 21) or radiography (from around day 40 to 45 when fetal bones mineralise). Always confirm timing with your vet.
How many kittens are in a typical litter?
Litter size varies widely, commonly around 3 to 5 kittens, though first-time and older queens may have fewer or more. Litter size does not change the gestation length used to estimate the due date.
Official sources
- Merck Veterinary Manual: Breeding and reproduction of cats.
- U.S. FDA Center for Veterinary Medicine: Animal & Veterinary.
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.