From the day she was bred, plus the average length of pregnancy for her kind (and her breed, for cattle). Each calculator page shows the numbers and where they come from.
Many printed tables count the breeding day as day 1. The calculators count from the breeding day itself, the way most online calculators do. Both dates are inside her window.
Pick “With the male a while” and enter the first and the last day they were together. The window then covers every possible breeding day.
Tell us with the form below — every message is read. And your vet wins: if the vet and the calculator disagree, go with the vet.
Your records stay on your phone and are included in your normal iPhone backup. There is no account, so there is nothing to sign in to.
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Send us a message below — a person reads every one, usually within two working days.