How is a due date calculated?

The standard method (Naegele's Rule) adds 280 days (40 weeks) to the first day of your last menstrual period.

How accurate is the due date?

Only about 5% of babies are born on their exact due date. Most births happen within 2 weeks before or after the estimated date.

When should I take a pregnancy test?

Most home pregnancy tests are accurate from the first day of a missed period. Testing a few days earlier may give a false negative.

Pregnancy Due Date Calculator

Calculate pregnancy due date, current week, and trimester based on last menstrual period.

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About Pregnancy Due Date Calculator

Calculate pregnancy due date, current week, and trimester based on last menstrual period. Powered by JustUse.me — free, ad-free, and private. This tool runs entirely in your browser. Your files are never uploaded to any server.

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