Pregnancy Due Date Calculator

Calculate your estimated due date based on your last menstrual period or conception date. Track your pregnancy progress and prepare for your baby's arrival.

Calculate Your Due Date

Calculation Method

First Day of Last Menstrual Period

Conception Date

Average Cycle Length (days)

Your Pregnancy Details

Estimated Due Date: -

Current Pregnancy Week: -

Trimester: -

Days Remaining: -

How to Calculate Your Due Date

Understanding how due dates are calculated can help you better track your pregnancy journey.

Choose Calculation Method

Select whether you want to calculate based on your last menstrual period (LMP) or conception date.

Enter Required Information

Provide the date of your last menstrual period or conception date, and your average cycle length.

Get Your Results

Receive your estimated due date, current pregnancy week, trimester, and days remaining.

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Why Use Our Pregnancy Calculator?

Our calculator provides accurate estimates and helpful information for your pregnancy journey.

Accurate Due Date

Get a reliable estimated due date based on standard medical calculations.

Pregnancy Progress

Track your current week, trimester, and days remaining until delivery.

Medical Standard

Based on Naegele's Rule, the standard method used by healthcare providers.

Mobile Friendly

Access our calculator on any device for convenient pregnancy tracking.

Privacy Focused

All calculations happen locally in your browser. We never store your data.

Helpful Information

Get insights about pregnancy stages and what to expect each week.

Frequently Asked Questions

Find answers to common questions about pregnancy due dates and calculations.

How accurate is the due date calculation?

Due date calculations are estimates based on standard medical formulas. Only about 5% of babies are born exactly on their due date. Most births occur within two weeks before or after the estimated due date.

What is Naegele's Rule?

Naegele's Rule is the standard method for calculating due dates. It adds 280 days (40 weeks) to the first day of your last menstrual period. This method assumes a 28-day menstrual cycle with ovulation on day 14.

How does cycle length affect due date?

If your menstrual cycle is longer or shorter than 28 days, the due date may need adjustment. Our calculator accounts for different cycle lengths to provide a more accurate estimate.

Can I calculate my due date if I know my conception date?

Yes, if you know your conception date, you can calculate your due date by adding 266 days (38 weeks) to that date. Our calculator offers both LMP and conception date methods.

What if I don't remember my last menstrual period?

If you don't remember your LMP, an ultrasound scan in early pregnancy can provide an accurate due date estimation. The earlier the ultrasound, the more accurate the due date prediction.

Why is my due date different from what my doctor calculated?

Healthcare providers may adjust due dates based on ultrasound measurements, especially if there's a discrepancy between LMP-based calculations and fetal size. Always follow your healthcare provider's guidance.