Calculators

Free and with no sign-up. They return ranges rather than single dates, because an exact date would be false: gestation is counted from ovulation, and almost nobody knows when their dog ovulated without a progesterone test.

• When will your dog give birth?

  Work out the likely whelping date for your dog from the mating date. Estimated range based on species averages, with the signs that labour is close.

• Which are your dog's fertile days?

  Estimate your dog's fertile days and when her next heat is due, from the first day of bleeding. Indicative only: ovulation is confirmed by progesterone testing.

• When will your cat give birth?

  Work out the likely queening date for your cat from the mating. Estimated range based on species averages.