How to use pregnancy week & trimester
Calculate weeks, days and trimester from an entered pregnancy reference date. This browser tool shows the inputs, assumptions and resulting output so you can use it for a specific everyday task.
- Enter your own values or choose a supported file.
- Adjust the options and run the tool.
- Review the result, then copy, export or save it when available.
Try this next
Enter the last-period date and a reference date to see elapsed weeks and days.
LMP dating assumes an appropriate reference date. A clinician may adjust pregnancy dating; use their confirmed date for care.
Questions, answered.
Is pregnancy week & trimester free to use?
Yes. This tool is part of Nepocore’s free browser toolkit. There is no paid tier, file-download gate or application account required.
What should I check before using the result?
LMP dating assumes an appropriate reference date. A clinician may adjust pregnancy dating; use their confirmed date for care.
Does this tool upload my files or text?
The tool processes its input in your browser. File contents and text are not sent to a processing server. See the privacy page for local storage and hosting details.