health calculator
Estimate pregnancy due date and milestones.
Save this tool to check your gestational timeline and track days remaining to delivery.
Estimated weeks pregnant
12 weeks
Formula
Estimated due date = last menstrual period + 280 daysThe common estimate uses 280 days from the last menstrual period, adjusted here for cycle length.
Step by step
Example
At 84 days since the last period with a 28-day cycle, the estimate is about 12 weeks pregnant with 196 days remaining.
Related guides
Guide
Learn how pregnancy due dates are calculated using Naegele rule, ultrasound dating, and conception dates. Understand due date accuracy and gestational age.
Guide
Understand conception timing, how sperm and egg viability affect fertility windows, and how to use ovulation tracking for planning or preventing pregnancy.
Summary
Weeks pregnant
12 weeks
Completed gestational age.
Days remaining
196 days
Time to expected delivery.
Due in
28.0 weeks
Weeks remaining.
Days completed
84 days
Total days completed.
D3 visualization
Estimated breakdown of gestational days completed against remaining days to due date.
D3 visualization
Compare completed pregnancy weeks against the standard full term boundary.
Guide
The pregnancy due date calculator estimates your delivery date using Naegele's Rule, adjusted for your average cycle length. It assumes a standard pregnancy duration of 280 days from the start of your last menstrual period.
Naegele's Rule
A standard method of calculating pregnancy due dates based on LMP.
Gestational age is calculated from the start of your last menstrual period, representing completed weeks of pregnancy.