Table of Contents
Pregnancy Due Date Calculator
📅 Pregnancy Due Date Calculator – User Guide
Calculating your baby’s estimated arrival date doesn’t need to be confusing. Our Pregnancy Due Date Calculator makes it fast, accurate, and simple — all you need is the first day of your last period and your average cycle length.
This tool uses a medically accepted method (Naegle’s Rule with cycle adjustment) to estimate your expected delivery date.
✅ How to Use the Pregnancy Due Date Calculator
Follow these easy steps:
Step 1 – Enter Your Last Period Date
In the first box, choose the first day of your last menstrual period (LMP) using the calendar picker.
Tip: This is the most important input for accurate results.
Step 2 – Set Your Cycle Length
Enter your average menstrual cycle length in days.
- Most women: 28 days (default)
- Short cycles: 21–27 days
- Longer cycles: 29–35 days
Step 3 – Click “Calculate Due Date”
Press the pink Calculate button to instantly see your pregnancy details.
📊 Your Results Will Show:
- Estimated Due Date
Full weekday, day, month, and year. - Trimester
Whether you’re in 1st, 2nd, or 3rd trimester. - Weeks Pregnant
How many weeks you are currently along. - Days to Go
Countdown until your due date.
🔄 Reset the Tool
Click the Reset button to clear all data and start over with a new calculation.
🔎 Example
If:
- LMP = June 1, 2025
- Cycle Length = 28 days
Results might be:
- ✅ Due Date: March 8, 2026
- ✅ Weeks Pregnant: 10 weeks
- ✅ Trimester: 1st
- ✅ Days Remaining: 210 days
(Dates will vary depending on today’s date.)
⚠️ Important Note
This calculator offers an estimate only.
Your actual delivery date may vary depending on your baby’s growth and your medical situation.
✅ Always follow guidance from your healthcare provider for precise pregnancy dating.
FAQ
Frequently Asked Questions
LMP means Last Menstrual Period. It’s the first day of your most recent period.
Ovulation timing differs with cycle length. Shorter or longer cycles change estimated conception and your due date slightly.
It uses the standard medical formula used worldwide. However, ultrasounds and doctor visits are the most accurate.
Use the default 28 days — it’s the average for most women.
Yes, but results may be less precise. Consult a doctor for accurate tracking in irregular cycles.
Yes. You can calculate your pregnancy progress anytime using your LMP date.