Conception Date Calculator

Estimate conception date, due date, and pregnancy progress using either due date or LMP.

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Enter your details

Due date (EDD) ℹ️

Option 1 — enter a due date, or use the LMP method below.

Conception date ℹ️

Option 2 — enter a conception date to auto-calculate the due date.

— or —

1st day of last period (LMP) ℹ️

Option 3 — combine with cycle length below.

Average cycle length ℹ️

Used only with the LMP method.

Gestational age display ℹ️

Display only—does not change calculations.

Tip: Ultrasound-based dating is more accurate than calendar estimates, especially with irregular cycles.

Results

Estimated conception date

Estimated due date (EDD)

You are (gestational age)

Ovulation day (approx.)

Fertile window (approx.)

Educational use only — not medical advice. For care or precise dating, consult a clinician.

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