How to calculate pregnancy weekly

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Calculating pregnancy week by week involves tracking the number of weeks since the start of your last menstrual period (LMP). It is good to know and monitor the progress of the pregnancy in weeks. Therefore, how to calculate pregnancy weekly is highly recommended.

Here’s a step-by-step guide:

  1. Determine the Date of Your Last Menstrual Period (LMP):
    • The first day of your last menstrual period is considered Day 1 of your pregnancy.
  2. Calculate the Number of Weeks:
    • Count the weeks that have passed since the first day of your LMP. Each week starts on the same day of the week as your LMP. For example, if your LMP was on a Monday, then each new pregnancy week begins on Monday.
  3. Use a Pregnancy Calendar or App:
    • There are many online pregnancy calculators and smartphone apps that can help you track your pregnancy week by week. Simply input the date of your LMP, and the tool will calculate your current week and due date.
  4. Confirm with Ultrasound:
    • During early prenatal visits, your healthcare provider may perform an ultrasound to confirm the gestational age of the baby, which can be more accurate than the LMP method. The ultrasound can adjust your estimated due date if needed.
How to calculate pregnancy weekly

Example Calculation:

  1. Find the LMP:
    • Suppose your LMP was January 1st.
  2. Count the Weeks:
    • Count the weeks from January 1st. If today is May 21st, you can calculate the weeks by determining how many weeks have passed between these dates.

To break it down:

  • From January 1st to April 1st is approximately 13 weeks.
  • From April 1st to May 1st is 4 weeks.
  • From May 1st to May 21st is 3 weeks.

So, from January 1st to May 21st is approximately 20 weeks.

  1. Pregnancy Week:
    • On May 21st, you will be in your 21st week of pregnancy.


  • Pregnancy is typically 40 weeks long, starting from the first day of your LMP.
  • The due date is usually calculated as 40 weeks from the LMP.

If you have irregular periods or are unsure of your LMP, your healthcare provider can use an early ultrasound to estimate the gestational age of the pregnancy more accurately.

Also read:

Useful Tips For A Successful Pregnancy

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