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How to use this calculator?

Gestational age calculator

Convert weeks + days into a specific date from your LMP or check how many weeks pregnant you are today. Perfect for tracking scans and prenatal appointments.

Calculation mode

Calculate weeks and days of pregnancy using LMP and a reference date.

Usually today, but choose another date to plan visits.

Pick a calculation mode to begin.

Enter your last period date and complete the fields for the selected mode.

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Gestational age: decode weeks and trimesters

Tracking gestational age

Convert weeks + days into specific dates or find out your current gestational age using your LMP. Ideal for coordinating scans and prenatal visits.

Available modes

  • Current gestational age Enter LMP and a reference date (today by default) to get weeks + days, trimester and days until due date.
  • Target date for a specific week Specify the target weeks + days and receive the estimated date when you will reach that milestone.

Form fields

  • FUR: first day of your last menstrual period.
  • Reference date lets you check gestational age on another key date (appointment, travel, etc.).
  • Weeks and days in “target date” mode, enter the desired combination (e.g. 32 weeks + 4 days).

Interpretation

Estimates depend on accurate LMP and early ultrasound confirmations. Always validate results with your healthcare team.

Sources