Pregnancy Week Calculator by Due Date
Answer the question, “How many weeks pregnant am I today?”
Use our interactive pregnancy calculator to determine your exact gestational age and track your upcoming baby milestones.
Whether you are planning your early gender reveal or preparing for a 3D/4D ultrasound in Toronto, this tool will provide an estimated pregnancy schedule based on the due date provided by your doctor.
Pregnancy Due Date & Week Calculator
Find out exactly how far along you are and what milestones are next.
We use your Estimated Due Date (EDD) to calculate your exact gestational age today.
How to Calculate Your Gestational Age
To pinpoint how far along you are, our reverse due date calculator works backward from your Estimated Due Date (EDD). A standard pregnancy lasts 40 weeks (280 days).
The formula to estimate your current week is:
- Step 1: Take your given Due Date.
- Step 2: Subtract 280 days to find out the first day of your Last Menstrual Period (LMP).
- Step 3: Calculate the total days between your LMP and today’s date.
Other Ways to Estimate Your Due Date
If your due date changes, it is completely normal. Healthcare providers may adjust your timeline based on:
- Ultrasound Scans: An early ultrasound scan during your first trimester is often the most accurate way to determine your EDD.
- Conception Date: If you have been using an ovulation tracker, you can add 266 days to your exact conception date.
- IVF Transfer Date: If you conceived via in vitro fertilization, your timeline is calculated based on a 3-day or 5-day IVF transfer date.
When is the Best Time for a 3D/4D Ultrasound?
Once you calculate your current week, you can perfectly time your visit to A Date With Baby in the Greater Toronto Area:
- Weeks 14 to 20: The ideal window to determine your baby’s sex with an Early Gender Reveal ultrasound.
- Weeks 26 to 32: The prime time for high-definition 3D/4D HD imagery, as your baby begins to develop distinct facial features and baby fat.
