Cat Pregnancy Due Date
Free Cat Pregnancy Due Date calculator with clear step-by-step results.
About Cat Pregnancy Due Date
Feline gestation averages about 65 days from mating, with normal queening falling between days 63 and 67. Adding the gestation length to the mating date gives the expected date, and the window either side is what tells you whether labour is early, on time or overdue.
Formulas
Due date
Due date = mating date + gestation days (65 by default)
Normal window
Normal delivery spans mating date + 63 to mating date + 67 days
Worked example
With the default values below, Cat Pregnancy Due Date returns Estimated due date of 2026-05-05. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Date of mating
- 2026-03-01
- Expected gestation lengthaccepts 58–72 days
- 65 days
Results
- Estimated due date
- 2026-05-05
- Earliest normal delivery (day 63)
- 2026-05-03
- Latest normal delivery (day 67)
- 2026-05-07
- Gestation length in weeks
- 9.3 weeks
Step by step
- 1Values used
- 2Due date
- 3Normal window
- 4Estimated due date= 2026-05-05
- 5Earliest normal delivery (day 63)= 2026-05-03
- 6Latest normal delivery (day 67)= 2026-05-07
- 7Gestation length in weeks= 9.3 weeks
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- An estimate based on average feline gestation. Ultrasound or radiographic staging by a veterinarian is far more reliable, and any sign of difficult labour is an emergency.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
An estimate based on average feline gestation. Ultrasound or radiographic staging by a veterinarian is far more reliable, and any sign of difficult labour is an emergency.
Frequently Asked Questions
What if mating happened over several days?
Cats can mate repeatedly across an oestrus. Use the first mating for the earliest possible date and the last for the latest, and treat the span as the queening window.
When should I be concerned?
Delivery before day 60 risks non-viable kittens, and going beyond day 70, or straining for more than 30 minutes without producing a kitten, warrants immediate veterinary attention.