How do I use the Pregnancy Due Date Calculator?

Enter the first day of your last period. Enter your average cycle length in days. 28 is the default, adjust if yours is different. You'll see your estimated due date, how far along you are, and your current trimester.

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.

Pregnancy Due Date Calculator

Estimate your due date based on your last period. Enter the first day of your LMP and your average cycle length and you'll get an estimated due date, current gestational age, and which trimester you're in.

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).

Mar 14, 2027

Estimated Due Date

0w 0d

Gestational age

Trimester

28 days

Cycle length used

280

Days to due date

How to use

Enter the first day of your last period.
Enter your average cycle length in days. 28 is the default, adjust if yours is different.
You'll see your estimated due date, how far along you are, and your current trimester.

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