How do I use the Pregnancy Due Date Calculator?

Select the first day of your last menstrual period (LMP). Enter your average cycle length (days). View estimated due date and gestational age.

Is the Pregnancy Due Date Calculator free?

Yes, the Pregnancy Due Date Calculator on ToolHaven is completely free to use. No signup or registration is required.

Estimate your pregnancy due date using Last Menstrual Period (LMP) and cycle length. Also shows gestational age and trimester.

Medical note

This is an estimate based on LMP and average cycle length. Actual due dates can vary. Confirm with your doctor/scan.

LMP (first day)

Average cycle length (days)

Typical range: 21–35 days (we allow 20–45).

Jan 29, 2027

Estimated Due Date

0w 0d

Gestational age

Trimester

28 days

Cycle length used

280

Days to due date

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