Pregnancy Weeks Calculator
Calculate current gestational age and due date from your last period
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
Enter the start date of your last menstrual period and instantly see your current week and day of pregnancy, the countdown to your due date, and which trimester you're in. All calculations run entirely in your browser, so nothing you enter is ever sent to a server, making it easy for expecting parents to check anytime with peace of mind. It's handy for getting a quick estimate before your next prenatal appointment.
How to use
- Click the last period start date field
- Select the date your last period began from the calendar
- View your current weeks and days pregnant, D-day countdown, due date, and trimester displayed at the top
- Change the date anytime to recalculate for a different point in time
FAQ
- How is the due date calculated?
- It's calculated by adding 280 days (40 weeks) to the start date of your last menstrual period, following the common Naegele's rule estimation method.
- Can the actual delivery date differ from this estimate?
- Yes, it can vary by several weeks depending on your individual cycle regularity and actual conception date. Always prioritize your obstetrician's ultrasound measurements for precise dating.
- Is my date information stored anywhere?
- No, all calculations happen entirely within your browser, and the date you enter is never sent to or stored on any server.