by MarkEnhanced Cat Pregnancy CalculatorEstimate your cat’s due date and track pregnancy stages. Mating Date ? Select the date of successful mating (e.g., 2025-04-01). Gestation Period (days) ? Average is 63 days; range is 58–71 days. Calculate ResetEnter the mating date, then click “Calculate”. JavaScript is disabled. Please enable it to use the calculator.