Pregnancy & Due Date Calculator

Your due date, week-by-week progress and key milestones

Calculate by

First day of your last menstrual period

Use the first day of bleeding, not the last.

Average cycle length

Luteal phase length

Embryo age at transfer

Gestational age at scan — weeks

Days

Estimated due date

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Gestational age

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Days remaining

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Trimester

1st trimester 2nd 3rd

This week

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Conception & fertile window

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Window opens

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Window closes

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Likely conception

Milestones & appointments

Focus for this stage

Read the full pregnancy week-by-week guide

These results are statistical estimates, not a diagnosis. Only about 4% of babies arrive on their exact due date. Always confirm dating with your doctor or midwife.