Calculator

Due date calculator

Estimate a due date from the first day of your last period. A dating scan or your maternity team may confirm or adjust the date.

First day of last periodUsual cycle length

Estimated due date

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This is an estimate based on 40 weeks from the first day of your last period, adjusted for the cycle length you selected. Your healthcare professional may use a scan or clinical details to adjust it.

For educational planning only. If you know your clinician-provided due date, use that as your source of truth.

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Educational health content

LioraBump provides educational pregnancy and baby development information only. It does not replace advice from a doctor, midwife, paediatrician, or other qualified healthcare professional. If you have urgent concerns, seek medical help immediately.