Last Menstrual Period (LMP)

Uses the first day of your last period to estimate your due date (LMP + 280 days).

First day of last period

Cycle length (days)

Conception Date

If you know the approximate date of conception, we'll add 266 days to estimate your due date.

Date of conception

Accurate when you know the embryo transfer date and embryo age at transfer.

Embryo age at transfer

Day 3 Cleavage stage Day 5 Blastocyst

Embryo transfer date

Use measurements from your scan — most accurate dating method in the first trimester (weeks 8–13).

Date of ultrasound

Gestational age at scan

Already know your due date? We'll estimate your conception date and approximate LMP.

Estimated due date

Estimated Due Date

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Weeks

Week 1 0% Complete Week 40

Current Week

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Trimester

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Conception Date

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Days Remaining

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Ovulation Date

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Baby's Zodiac

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Next Milestone

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Full Term Date

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