Pregnancy Due Date Calculator
Calculate your baby's due date
Default: 28 days (typical range: 21-35)
Pregnancy by Trimester
First Trimester (Weeks 1-12)
Most crucial development period
- • Heartbeat starts (week 5-6)
- • All major organs forming
- • Morning sickness common
- • Fatigue and mood swings
Second Trimester (Weeks 13-27)
The "honeymoon" period
- • Feel baby move (quickening)
- • Find out gender (week 18-20)
- • Energy returns
- • Baby bump shows
Third Trimester (Weeks 28-40)
Final preparations
- • Baby gains most weight
- • More frequent doctor visits
- • Braxton Hicks contractions
- • Prepare for delivery
Important Pregnancy Facts
- Due dates are estimates: Only 5% of babies arrive on their due date. 40 weeks is average.
- Full term range: 37-42 weeks. Babies born before 37 weeks are premature.
- First babies: Often arrive 1-2 days late on average.
- Ultrasound dating: Most accurate when done before 13 weeks.
- Conception vs. gestational age: Pregnancy is dated from LMP (gestational age), not conception. Conception age is ~2 weeks less.
How to Use This Calculator
1Enter Your Values
Input the required values in the calculator fields above. Make sure all inputs are valid numbers.
2Click Calculate
Press the "Calculate" button to perform the calculation and see your results.
3Review Results
Review the calculated results displayed below. Use these values for your needs.
Formula
Formula will be calculated based on the inputs provided.
Example:
Example: Enter your values above and click Calculate to see the formula in action.
About Pregnancy Due Date Calculator
The Pregnancy Due Date Calculator is a useful tool for calculating pregnancy due date values. This calculator helps you quickly and accurately determine the results you need for your calculations.
When to Use This Calculator
- Quick Calculations: Get instant results without manual computation
- Accuracy: Ensure precise calculations every time
- Planning: Use for project planning and estimation
- Verification: Double-check your manual calculations
Why Use Our Calculator?
- ✅ Instant Results: Get accurate calculations immediately
- ✅ Easy to Use: Simple interface for all skill levels
- ✅ 100% Free: No registration or payment required
- ✅ Mobile Friendly: Works on all devices
- ✅ Accurate: Precise mathematical calculations
Tips for Best Results
- Double-Check Inputs: Verify all values before calculating
- Use Valid Numbers: Ensure inputs are valid numbers
- Review Results: Check results for reasonableness
- Clear and Retry: Clear inputs if you need to recalculate
Frequently Asked Questions
How to Use This Calculator
Enter Your Values
Input the required values in the calculator fields above. Make sure all inputs are valid numbers.
Click Calculate
Press the "Calculate" button to perform the calculation and see your results.
Review Results
Review the calculated results displayed below. Use these values for your needs.
Formula
Formula will be calculated based on the inputs provided.
Example:
Example: Enter your values above and click Calculate to see the formula in action.
About Pregnancy Due Date Calculator
The Pregnancy Due Date Calculator is a useful tool for calculating pregnancy due date values. This calculator helps you quickly and accurately determine the results you need for your calculations.
When to Use This Calculator
- Quick Calculations: Get instant results without manual computation
- Accuracy: Ensure precise calculations every time
- Planning: Use for project planning and estimation
- Verification: Double-check your manual calculations
Why Use Our Calculator?
- ✅ Instant Results: Get accurate calculations immediately
- ✅ Easy to Use: Simple interface for all skill levels
- ✅ 100% Free: No registration or payment required
- ✅ Mobile Friendly: Works on all devices
- ✅ Accurate: Precise mathematical calculations
Tips for Best Results
- Double-Check Inputs: Verify all values before calculating
- Use Valid Numbers: Ensure inputs are valid numbers
- Review Results: Check results for reasonableness
- Clear and Retry: Clear inputs if you need to recalculate
How accurate is the due date?
Due dates are estimates. Only about 5% of babies arrive on their exact due date. Most are born within 2 weeks before or after.
Why is pregnancy 40 weeks but 9 months?
Pregnancy is actually 10 lunar months (28 days each) = 280 days = 40 weeks ≈ 9 calendar months. It's counted from your last period, not conception.
Which method is most accurate?
Early ultrasound (before 13 weeks) is most accurate. Last period method assumes regular 28-day cycles. IVF/conception date is very accurate if known.
Can my due date change?
Yes! After early ultrasound measurement, your provider may adjust your due date. This is most accurate and usually won't change again.
What if I go past my due date?
Normal! 50% of first-time moms go past their due date. Most doctors induce labor by 41-42 weeks. Baby is closely monitored.