Inputs
Health calculator
Due Date Calculator
Use this when conception timing is clearer than menstrual-cycle timing.
Results
Due date summary
Estimated due dateDec 15, 2026
Estimated last periodMar 10, 2026
Pregnancy length from conception266 days
Guide
How the due date calculator works
This tool adds the standard number of pregnancy days to a conception date to estimate the expected due date.
- Use current body data, activity details, or date inputs for the most useful estimate.
- Use the result as a practical health reference point or planning aid.
- Combine calculator results with professional advice when a medical decision is involved.
FAQ
Common Due Date questions
What does this due date calculator show?
Helpful for a quick pregnancy timeline when you already have a conception reference point.
Should I treat this as an official result?
It is best used as a reference or planning tool. It does not replace a clinical assessment.