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Pregnancy Due Date Calculator
Calculate due date, track pregnancy progress, and monitor baby's development
Pregnancy Information
Current Progress
Due Date
Conception Date
Current Status
Pregnancy Progress
Quick Summary
Milestones & Medical Appointments
How Pregnancy Due Date Calculation Works
Naegele's Rule
Due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is the standard medical method used worldwide.
Cycle Length Adjustment
For cycles different from 28 days, the due date is adjusted. Longer cycles add days, shorter cycles subtract days from the standard calculation.
Conception Date
Conception typically occurs around ovulation, approximately 14 days after LMP for a 28-day cycle. This is adjusted based on your cycle length.
Pregnancy Weeks
Pregnancy is counted from LMP, not conception. You're currently 0 weeks and 0 days pregnant, in the first trimester.
Pregnancy Health Guidelines
Essential Care:
- • Prenatal Vitamins: Start folic acid (400-800mcg daily)
- • Regular Checkups: Monthly until 28 weeks, then more frequent
- • Healthy Diet: Balanced nutrition, avoid harmful foods
- • Stay Hydrated: 8-10 glasses of water daily
Important Reminders:
- • No Alcohol/Smoking: Completely avoid during pregnancy
- • Safe Exercise: Moderate activity as recommended by doctor
- • Weight Gain: 25-35 lbs for normal BMI
- • Sleep: 7-9 hours, sleep on left side after 20 weeks
Your Pregnancy Status:
Pregnancy Due Date Calculator FAQs
How is my due date calculated?
This calculator uses Naegele's Rule: adding 280 days (40 weeks) to the first day of your last menstrual period (LMP), then adjusting for your actual cycle length if it differs from the standard 28 days.
Why is pregnancy counted from my last period instead of conception?
Doctors count pregnancy from LMP because the exact conception date is usually unknown, while the start of the last period is easier to identify. This means you are considered about 2 weeks pregnant on the day you actually conceive.
How accurate is a due date calculated this way?
Naegele's Rule gives a good estimate, but only about 5% of babies are born exactly on their due date. Most births occur within a window of one to two weeks before or after. An early ultrasound provides a more precise estimate than LMP-based calculation alone.
What if my cycle is not exactly 28 days?
This calculator adjusts the due date based on your cycle length input - longer cycles push the due date later, and shorter cycles bring it earlier, since ovulation timing shifts with cycle length.
Is this due date calculator a substitute for prenatal care?
No. This tool gives an estimate for planning purposes only and is not medical advice. Always confirm your due date and pregnancy progress with a doctor or qualified healthcare provider through regular prenatal checkups and ultrasounds.
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