Estimated Gestational Age (EGA) from LMP

Calculates estimated gestational age and due date using Naegele's Rule: EDD = LMP + 280 days (40 weeks). Alternatively: EDD = LMP + 1 year − 3 months + 7 days. Gestational age in weeks = (today − LMP) ÷ 7. Crown-rump length ultrasound is most accurate before 14 weeks.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculates estimated gestational age and due date using Naegele's Rule: EDD = LMP + 280 days (40 weeks). Alternatively: EDD = LMP + 1 year − 3 months + 7 days. Gestational age in weeks = (today − LMP) ÷ 7. Crown-rump length ultrasound is most accurate before 14 weeks

Each component has a specific meaning:

  • Naegele's Rule: EDD = LMP + 280 days — The naegele's rule: edd = lmp + 280 days recorded for the scenario being assessed.

Note: Interpret the ega from lmp result against the thresholds and context described above.

How to Use

Enter the Naegele's Rule: EDD = LMP + 280 days for the scenario you are assessing. Calculates estimated gestational age and due date using Naegele's Rule: EDD = LMP + 280 days (40 weeks). Alternatively: EDD = LMP + 1 year − 3 months + 7 days. Gestational age in weeks = (today − LMP) ÷ 7. Crown-rump length ultrasound is most accurate before 14 weeks. Use the ega from lmp result to inform your calculation.

Frequently Asked Questions