Pregnancy Due Date Calculator - Free, Instant, In Your Browser
Enter the first day of your last menstrual period to estimate your due date (LMP + 280 days).
How to use Pregnancy Due Date Calculator
- 1Enter the required date(s) and details above.
- 2Click Calculate - Pregnancy Due Date Calculator runs instantly, right in your browser.
- 3Read your result below.
Your file is processed in your browser and is never uploaded.
Frequently Asked Questions
How is this calculated?
Using a standard, well-established algorithm - see the description above for the specific method and its accuracy.
Is my data sent to a server?
No - everything runs entirely in your browser with JavaScript. Nothing is uploaded.