Pregnancy Week Calculator
Estimate gestational week and day from the last menstrual period date. Confirm dating with a clinician.
Start with your input
Edit the example or replace it with your own text.
Choose your options
These settings are optional. Keep the defaults to get started.
How to use Pregnancy Week Calculator
- Enter the information requested for pregnancy week calculator.
- Review inputs and units, then run the tool.
- Check the result and copy or download it for your workflow.
How Pregnancy Week Calculator works
Estimate gestational week and day from the last menstrual period date. Confirm dating with a clinician. Results are based only on the inputs you provide. This tool does not access or verify private account, search ranking or analytics data.
Use the result carefully
Check output against the source data and destination platform requirements. Estimates and previews are not official measurements or professional advice. For regulated, financial, health or safety decisions, confirm assumptions with an appropriate qualified source.
Example input
Last menstrual period date
How do I use the pregnancy week calculator?
Enter the relevant inputs and select Run. Estimate gestational week and day from the last menstrual period date. Confirm dating with a clinician.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.