Gestational Age Calculator
Want your due date instead? Try the Due Date Calculator.
How to Use the Gestational Age Calculator
- Enter the first day of your last menstrual period (LMP).
- Click Calculate Gestational Age.
- The tool counts the number of days between your LMP and today.
- It converts that number into weeks + days.
This calculator is helpful for anyone wanting to quickly figure out:
- “What is my gestational age today?”
- “How many weeks pregnant am I?”
- “What is my GA based on LMP?”
Everything is based on simple date math.
FAQ
How is gestational age calculated?
The calculator counts the number of days since your LMP and divides by 7 to determine weeks and days. This is the universal method for gestational age dating.
Why does gestational age start at the LMP?
Because pregnancy dating uses the 40 week model, which includes the two weeks before ovulation. This is the standard baseline for gestational age math.
Is gestational age the same as pregnancy weeks?
Yes — gestational age and pregnancy weeks are calculated the same way using LMP.
Does this give a medically verified gestational age?
No — this is a date math calculator only, not medical advice. It simply counts weeks from your LMP.
Can this help with pregnancy tracking?
Yes. Many people use this tool for:
- “gestational age from LMP calculator”
- “GA by date”
- “how many weeks pregnant am I today”
It’s a quick way to understand your place in the pregnancy timeline.