Pregnancy Due Date Calculator Using HTML, CSS and JavaScript with Source Code
Welcome to the Pregnancy Due Date Calculator – your personalized tool for estimating your baby's arrival date and tracking every important milestone along the way! This interactive web app combines medical accuracy with a beautiful, user-friendly design to help expecting parents navigate their pregnancy journey with confidence. Whether you're just finding out you're pregnant or well into your third trimester, our calculator provides clear, reliable estimates along with helpful tips tailored to your current stage.
Built with modern web technologies (HTML, CSS, and JavaScript), this tool offers multiple calculation methods to suit your needs. Simply enter your information using either your last menstrual period, conception date, or ultrasound details, and instantly receive your estimated due date along with a visual pregnancy timeline, progress tracker, and trimester-specific advice. The clean, responsive design works perfectly on any device, making it easy to check your progress whenever you need reassurance or information about your developing baby.
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Key Features:
✅ Multiple Calculation Methods
Estimate due date using:
Last Menstrual Period (LMP) (Naegele’s rule)
Conception Date
Ultrasound Dating (gestational age)
✅ Interactive Pregnancy Timeline
Visual milestones (ovulation, trimesters, anatomy scan, due date)
Color-coded status (completed / current / upcoming)
✅ Pregnancy Progress Tracker
Progress bar showing completion percentage
Current week & day, remaining days, and trimester
✅ Personalized Tips & Advice
Stage-specific recommendations for each trimester
General pregnancy wellness tips
✅ Modern & Responsive Design
Clean, mobile-friendly UI with smooth animations
Card-based layout for easy readability
Technologies Used:
🛠 Frontend:
HTML5 – Structure and content
CSS3 – Styling, animations, and responsive design
JavaScript – Dynamic calculations and interactivity
🎨 Design Elements:
Google Fonts (Poppins) – Modern typography
Font Awesome Icons – Visual cues for better UX
CSS Flexbox & Grid – Layout organization
Custom Animations – Smooth transitions
How to Use:
Select a Calculation Method
Choose between LMP, Conception Date, or Ultrasound Dating.Enter Required Details
For LMP: Input the first day of your last period and cycle length.
For Conception Date: Provide the estimated conception date.
For Ultrasound Dating: Enter the ultrasound date and gestational age.
Click "Calculate Due Date"
Instantly see your estimated due date and pregnancy progress.Explore Results
View your due date, trimester, fetal age, and remaining days.
Check the interactive timeline for key milestones.
Get personalized tips for your current stage.
Reset & Recalculate
Use the "Reset" button to start a new calculation.
Sample Screenshots of the Project
Landing Page (Last Menstrual Period Page)

Conception Date

Ultrasound Date

Sample Calculation
How to Run?
- Download the provided source code zip file.
- Extract the downloaded zip file.
- Open the html file and you are now ready to go!
Video Demonstration for Installation/Setup:
Conclusion:
In conclusion, the Pregnancy Due Date Calculator offers expecting parents a reliable, beautifully designed tool to estimate their due date and track pregnancy milestones with ease. By combining medical accuracy with an intuitive interface and personalized insights, this web app transforms complex calculations into a simple, engaging experience—helping you stay informed and excited throughout your pregnancy journey.
Remember: while this calculator provides helpful estimates, always consult your healthcare provider for personalized medical advice.
That's it! I hope this "Pregnancy Due Date Calculator Using HTML, CSS and JavaScript" will assist you on your programming journey, providing value to your current and upcoming projects.
For additional tutorials and free source codes, explore our website.
Enjoy Coding :>>
Note: Due to the size or complexity of this submission, the author has submitted it as a .zip file to shorten your download time. After downloading it, you will need a program like Winzip to decompress it.
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