If she mated over several days, use the first one — the window below covers the spread.
Estimated due date (day 65)
—
Most likely window: pick a date above
Most litters arrive between day 63 and day 67.
Why 65 days?
Feline gestation runs about 63–67 days from mating, averaging ~65 days. Without a known mating date, a vet can estimate stage by palpation, ultrasound, or x-ray.
🗓️ Week-by-week milestones
An estimate — every cat differs. Ask your vet for prenatal care, and if you weren't planning a litter, ask about spaying. This tool is general guidance, not veterinary advice.
🧰 More free cat tools
🎂
Cat Age Calculator
Cat years → human years, vet-based.
📈Kitten Weight Calculator
How big will your kitten get?
🐟Cat Food Calculator
Daily portions and calorie targets.
💰Cat Cost Calculator
What a cat really costs per year.
🩺Is My Cat Overweight?
Is your cat a healthy weight?
📖Cat Gestation Guide
How long are cats pregnant, explained.