Due Date Calculator
Calculate your estimated due date and pregnancy milestones
Due Date Calculation Examples
LMP Method
Last Period: June 1, 2024
Cycle Length: 28 days
Due Date: March 7, 2025
Based on Naegele's rule
Conception Date
Conception: June 15, 2024
Known ovulation
Due Date: March 7, 2025
Adding 266 days
Ultrasound Dating
Scan Date: August 1, 2024
12 weeks measured
Due Date: March 7, 2025
Based on fetal measurements
Due Date Calculation Methods
Naegele's Rule (LMP)
Due Date = LMP + 1 year + 7 days - 3 months
Adjustments:
+/- days based on cycle length
Standard 28-day cycle assumed
Conception Method
Due Date = Conception + 266 days
Based on:
Average pregnancy length
Known conception date
Ultrasound Dating
Due Date = Scan Date + (40 - Measured Weeks) weeks
Most accurate between:
8-12 weeks for dating
Considers fetal size
Benefits & Features
Our due date calculator offers essential benefits for pregnancy planning:
Pregnancy Timeline
- Due date estimation
- Trimester tracking
- Milestone planning
- Development stages
- Important dates
Health Planning
- Prenatal care scheduling
- Doctor visit timing
- Health checkpoints
- Screening dates
- Preparation timeline
Pregnancy Guide
- Weekly development info
- Health recommendations
- Lifestyle adjustments
- Nutrition guidance
- Exercise planning
Frequently Asked Questions
How accurate is the due date calculator?
Due date accuracy depends on:
- Calculation method used
- Regular menstrual cycles
- Accurate date information
- Individual variations
- Only 5% deliver on exact date
Which calculation method is best?
Method reliability order:
- Early ultrasound (most accurate)
- Known conception date
- Last menstrual period
- Late ultrasound (least accurate)
- Combine methods for best results
What affects due date accuracy?
Factors influencing accuracy:
- Cycle length variations
- Late ovulation
- Irregular periods
- First pregnancy vs subsequent
- Individual factors
When is delivery considered full term?
Pregnancy terms defined:
- Early term: 37-38 weeks
- Full term: 39-40 weeks
- Late term: 41 weeks
- Post term: 42+ weeks
- Most deliver 37-42 weeks
How are trimesters calculated?
Pregnancy divided into:
- First: Weeks 1-13
- Second: Weeks 14-26
- Third: Weeks 27-40+
- Each has unique milestones
- Development stages vary