Pregnancy Wheel Calculator
Calculate gestational age, estimated due date, and trimester from the last menstrual period (LMP) using Naegele's rule.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Gestational Age (Weeks)
12weeks
Trimester
1
How to Use This Calculator
- Enter the first day of the last menstrual period (LMP).
- Review estimated due date (EDD), gestational age in weeks and days, and trimester.
- Confirm with first-trimester ultrasound dating when available.
How the result changes with Days Since LMP
| Days Since LMP | Gestational Age (Weeks) | Trimester |
|---|---|---|
| 30 | 4weeks | 1 |
| 105 | 15weeks | 2 |
| 195 | 27weeks | 2 |
| 270 | 38weeks | 3 |
What each input means
- Days Since LMP
- Number of days since the first day of the last menstrual period. Typical pregnancy is 280 days (40 weeks).
How this is calculated
Worked example, using the default values
- Identify Input ParametersDays Since LMP = 84 = 1 input(s) provided
- Calculate Gestational AgeGestational Age12 = 12
- Calculate TrimesterTrimester1 = 1
- Calculate Plus DaysPlus Days0 = 0
- Calculate Days Until EDDDays Until EDD = max(0196 = 196
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