Pregnancy Due Date Calculator

EDD, conception window, gestational age & trimester • LMP / Conception / Ultrasound

Calculate using Last Menstrual Period (LMP) — Naegele's rule Known Conception Date Ultrasound/Best Estimate (enter EDD)

First day of last menstrual period (LMP)

Average cycle length (days)

Luteal phase length (days, optional)

Estimated conception/date of ovulation

Ultrasound EDD (best estimate) Notes (GA at scan, optional)

As of (optional)

 

Leave empty to use today.

Tip: LMP + 280 days (40 weeks) is the standard Naegele's rule. Adjust for cycle length if different from 28 days.

Estimated Due Date (EDD)

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Conception Window

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Current Gestational Age

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Trimester

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Notes & Guidance

Use this tool for estimation only. EDD can change with early ultrasound. For medical advice, consult your healthcare provider.

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The Calculator Way of Using the Pregnancy Due Date Calculator

Pregnancy Due Date Calculator is a convenient application that allows parents-to-be to calculate the delivery period of the embryo, their current week and trimester. This can be calculated: by Last Menstrual Period (LMP), Conception Date or Ultrasound Date estimated Date due EDD.

Step 1: Choose a Calculation Method

There are three options in the calculator:

By LMP (Last Menstrual Period): Put the first day of the last period. The due date calculator will estimate an approximate 40 weeks of days (or approximately 280 days) to add to the date your baby was conceived.

By date of conception: In case you have the correct date of conception, input it. The calculator calculates 266 days (38 weeks) of conception to get to the due date.

With an ultrasound EDD In case you are provided with an ultrasound-based due date, simply enter it.

Step 2:Step Ad astrum/Setup weeks/Callibrate cycle length (OPTIONAL)

In case your cycle is not 28 days long, insert your average cycle length. A longer or shorter cycle will modify the calculation

Step 3: Enter As of date (Optional)

Unless otherwise selected, the calculator displays the gestational age today. If you wish to finalise progress as at a certain date (e.g. doctor appointment), enter this date in the As of field.

Step 4: On the top right, click Calculate

Once you enter the information you press Calculate. The calculator displays the

Estimated Due Date (EDD)

Guess Conception/ovulation Period

GA (wks+dys)

Current Trimester

Step 5: Review and Save Results

You can:

Copy the result to make it available to your doctor or partner.

Share them on share option of your device.

Export to your Calendar (.ics file) that Glue will add to the due date on your digital calendar.

Tips on the best use

Enter with various calculations (LMP vs. Ultrasound EDD) compare the results.

Be sure to keep in mind that this tool is only an estimate- your physician and scans are more precise.

You can click the optional demo buttons to see quick sample results without having to enter a date.