Pregnancy Calculator
Pregnancy Calculator – Track Your Due Date, Trimester & More
A Pregnancy Calculator helps estimate your due date, track the stages of pregnancy, and understand important milestones. Whether you're planning, newly pregnant, or just curious, this tool provides essential insights based on your last menstrual period (LMP) or conception date.
How Long Is a Full-Term Pregnancy?
A typical pregnancy lasts about 40 weeks from the first day of your last period or 38 weeks from conception. According to the World Health Organization, a full-term pregnancy is between 37 to 42 weeks. Your doctor will likely confirm your due date with a sonogram during your first OB-GYN visit, but you can get a reliable estimate using this calculator.
Important statistics to know:
- 🔹 Only 4% of births occur on the exact due date
- 🔹 60% happen within a week of the due date
- 🔹 Nearly 90% occur within two weeks before or after the due date
This means the due date is a helpful guide—not a guarantee.
Early Signs & Pregnancy Detection
Pregnancy can be detected through:
- Home Pregnancy Tests: Detect hCG hormone from 6–8 days post-fertilization
- Clinical Blood Tests: More accurate, detect smaller hormone levels
- Symptoms: Missed periods, fatigue, nausea, frequent urination, or increased body temperature
Pregnancy Health: What You Should Know
1. Medications During Pregnancy
Certain medications may impact fetal development. The FDA classifies drugs from Category A (safe) to Category X (harmful). Always consult your doctor before taking any medication while pregnant.
2. Recommended Weight Gain
Healthy weight gain varies by Body Mass Index (BMI):
- Underweight (BMI < 18.5): 28–40 lbs
- Normal (BMI 18.5–24.9): 25–35 lbs
- Overweight (BMI 25–29.9): 15–25 lbs
- Obese (BMI ≥ 30): 11–20 lbs
Use our Pregnancy Weight Gain Calculator to find your ideal range.
3. Exercise During Pregnancy
Moderate aerobic and strength training can be beneficial. According to the American College of Obstetricians and Gynecologists, exercise may reduce the risk of C-sections and improve overall health. However, stop and consult your doctor if you experience:
- Vaginal bleeding
- Dizziness or shortness of breath
- Severe headaches
- Swelling or pain in the legs
- Decreased fetal movement
4. Pregnancy Nutrition
Pregnancy increases your need for energy and nutrients:
- Folic Acid (Vitamin B9): Reduces birth defect risk
- DHA Omega-3: Supports brain and eye development
- Iron, Calcium, Iodine, and other micronutrients are vital too
Always consult a doctor or dietitian for personalized guidance.
Why Use a Pregnancy Calculator?
A pregnancy calculator helps:
- Estimate your due date
- Track trimester progress
- Plan doctor visits and tests
- Understand your baby's development week-by-week
Plan your pregnancy journey with confidence—use our free Pregnancy Calculator to stay informed every step of the way.
How to Use the Pregnancy Calculator
Step 1: Choose Your Calculation Method
Select the most appropriate method based on the information you have:
- Due Date: If you already know your due date from a healthcare provider
- Last Period: If you know when your last menstrual period started (most common method)
- Ultrasound: If you've had an ultrasound and know the gestational age at that time
- Conception Date: If you know or can estimate when conception occurred
- IVF Transfer: If you conceived through IVF and know your embryo transfer date
Step 2: Enter Your Information
Depending on your selected method, enter the required information:
For Last Period Method:
- First day of your last period
- Average length of your menstrual cycles
For Ultrasound Method:
- Date of the ultrasound
- Gestational age (weeks and days) at ultrasound
Step 3: Calculate and Review Results
After clicking "Calculate Pregnancy," you'll see:
- Your estimated due date
- Current week of pregnancy
- Current trimester
- Percentage of pregnancy completed
- Estimated conception date
- Estimated baby size and weight
Step 4: Explore Your Pregnancy Timeline
The timeline tab provides a week-by-week breakdown of your pregnancy, including:
- Important developmental milestones
- Trimester transitions
- Date ranges for each week
- Highlighting of your current week
Understanding Your Results
- First Trimester (Weeks 1-12): Early development, highest risk period
- Second Trimester (Weeks 13-27): Rapid growth, gender determination possible
- Third Trimester (Weeks 28-40): Final development, preparation for birth
- Full Term: 39-40 weeks, though delivery between 37-42 weeks is considered normal
Important Notes
- This calculator provides estimates based on standard pregnancy duration
- Only about 4% of women deliver exactly on their due date
- About 60% deliver within a week of their due date
- For the most accurate dating, consult with your healthcare provider
- An early ultrasound (8-12 weeks) provides the most reliable due date