A pregnancy due date helps you calculate pregnancy due date values accurately and instantly.
Estimate your due date using Naegele's rule based on your last menstrual period.
Due Date = LMP + 280 days (40 weeks)
Or: LMP month − 3, day + 7, year + 1 (if needed)
Naegele's rule adds 280 days (40 weeks) to the first day of the last menstrual period to estimate the due date.
The Pregnancy Due Date Calculator uses standard formulas to calculate your results. Enter your values in the input fields and click Calculate to see instant results.
Yes, the Pregnancy Due Date Calculator on CalcMaster is completely free to use with no signup required. Your data stays in your browser and is never sent to any server.
The Pregnancy Due Date Calculator uses verified formulas and provides accurate estimates for informational purposes. Results are calculated instantly in your browser.