Enter the mating date to get your cat's kitten due date, the likely queening window, and a week-by-week guide.
Cat pregnancy (gestation) averages about 63 to 65 days — roughly two months. Births can happen a little earlier or later, so the due date is an estimate, not an exact deadline. This calculator adds 64 days to your mating date for the expected due date and shows a likely queening window of 63–65 days.
| Stage | What's happening |
|---|---|
| Weeks 1–3 (days 1–21) | Fertilization and implantation. A vet can often confirm pregnancy by ultrasound around day 21. |
| Weeks 4–5 (days 22–35) | Kittens develop quickly; nipples become pink and enlarged ("pinking up"). Appetite grows. |
| Weeks 6–7 (days 36–49) | The belly is clearly rounded and kittens can sometimes be felt moving. The queen may start nesting. |
| Weeks 8–9 (days 50–65) | Kittens are fully formed. The queen seeks a quiet nesting spot; a temperature drop can signal labor within about a day. |
Because the exact mating moment is often unknown, this is an estimate for information, not veterinary advice — your vet can confirm the timeline. Source: average feline gestation of 63–65 days (PetMD); some healthy pregnancies fall a little outside that range.