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Pregnancy Due Date Calculator
Estimate your due date from the first day of your last period.
About this calculator
The due date is estimated as 280 days (40 weeks) after the first day of your last menstrual period. Conception usually happens about 14 days after that date. Example: a last period starting on 1 January 2026 gives a due date of 8 October 2026.
Results are estimates for information only. Please confirm important decisions with a qualified professional.
Frequently asked questions
How accurate is the due date?
It is an estimate. Only about 5% of babies are born on the exact date, and most arrive within two weeks of it.
What if my cycle is irregular?
An ultrasound scan from your doctor gives a better estimate.