How to Determine Your Due Date
The due date for a pregnancy is an estimation of when your baby will be born. A typical pregnancy lasts about 40 weeks, and most women will deliver their baby within two weeks before or after their estimated due date. There are different methods for determining your estimated pregnancy due date including Naegle's rule, last menstrual period method, using the conception date and an online due date calculator.
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Instructions
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Naegle's Rule
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1
Determine the first day of your last normal menstrual period using a calendar.
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2
Count backward three months using a calendar.
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3
Add seven days to the date using a calculator or a pen and paper.
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4
Adjust the year if needed.
Last Menstrual Period Method
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5
Determine the first day of your last normal menstrual period.
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6
Add 14 days to determine the date of conception.
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7
Add 266 days to this date.
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8
Adjust the year if needed.
Conception Date
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9
Determine the date of conception.
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10
Add 266 days to this date.
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11
Adjust the year if needed.
Online Due Date Calculator
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Input the first day of your last normal menstrual period.
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Input the average length of your menstrual cycle if required.
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Press enter or follow the onscreen prompts to calculate the estimated pregnancy due date.
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Tips & Warnings
If using the conception date to calculate your estimated due date, be aware that, according to the Mayo Clinic, sperm can live in the cervical mucus for up to five days.
Links to different online pregnancy due date calculators are available in the resources section.
