About DueBarn

DueBarn gives one clear answer for seven species: the expected due date, the normal window around it, and the next milestone to plan for. Gestation lengths come from breed association charts and university extension guides, and each page lists the figure it uses.

How the numbers are checked

Gestation lengths come from breed association charts and university extension guides. Each page lists the average used and the normal range around it. Every tool runs in your browser, and each page shows its formula so you can check the math yourself. Before publishing, every calculator is tested against worked examples, and pages are reviewed when standards or reference data change.

Limits

Results are estimates for planning. They do not replace a site survey, a qualified professional, or the rules that apply where you live.

Corrections

If a figure looks wrong, please contact us with the page and the value. Confirmed errors are fixed quickly.