Pregnancy Due Date Calculator
Estimate your baby's due date based on the first day of your last menstrual period.
Input Parameters
Enter details for calculation.
Estimated Due Date
Expert Tip
A standard pregnancy averages 280 days (40 weeks) from the first day of the last period. Only about 4% of babies are born exactly on their due date.
Calculation Methodology & Details
Formula
Applies Naegele's Rule adjusting for custom menstrual cycle lengths.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional advice or diagnostic validation. Always consult a qualified specialist.
How Due Dates are Projected
Follow these steps to complete the calculation:
Provide Cycle Length
Enter average length of menstrual cycle.
Read Due Date
Review estimated baby due date.
Related Tools
Detailed Insights & Expert Guide
ℹ️ About this Calculation
This calculator helps you perform precise pregnancy due date computations instantly. Whether you need to find the gap between two dates, calculate your exact age, count working days, or plan around time zones, every result is generated in real time with full accuracy.
Variable Glossary
Start Date / Reference Date
The primary date used as the reference point for the calculation (e.g., birthdate, project start).
End Date / Target Date
The secondary date compared against or subtracted from the start date.
Unit / Format
The preferred output unit: days, weeks, months, or years.
How to Calculate Step-by-Step
Step 1
Enter your starting date (such as a birthdate or today's date) in the first input field.
Step 2
If applicable, enter the target or end date in the second field.
Step 3
Select your preferred output unit (days, weeks, months, or years).
Step 4
The result is instantly calculated and displayed in the result card.