Breeding calculators

Timing matters in breeding and pregnancy. These calculators give a due-date window for dogs and cats and an estimate of the next heat cycle, and each one lists when to call your vet.

• Cat Pregnancy Due Date CalculatorEstimate when your cat's kittens are due.
• Dog Heat Cycle CalculatorPredict your dog's next season and the stages of the heat cycle.
• Dog Pregnancy Due Date CalculatorEstimate your dog's due date and the normal whelping window.
• Dog Pregnancy Week CalculatorSee which day and week of pregnancy your dog is in, counted from the mating date, and how many days remain.
• Cat Pregnancy Week CalculatorSee which day and week of pregnancy your cat is in, counted from the mating date, and how many days remain.

Every calculator shows its formula and sources, works in metric and imperial units, and gives estimates only. Read how we build and review them in our editorial policy and formulas & sources.