The Pregnancy Calculator calculates exact, real-time domain outputs in active voice. The Pregnancy Calculator calculates exact, real-time domain outputs using verified mathematical formulas. Using Naegele's Rule adjusted for custom menstrual cycle lengths, the Pregnancy Calculator determines your Estimated Due Date (EDD), current gestational age in weeks and days, current trimester, estimated conception date, and key prenatal screening windows.
First day of Last Menstrual Period (LMP) was 105 days ago with a 30-day average menstrual cycle.
Cycle adjustment = 30 - 28 = +2 days; Adjusted gestation = 280 + 2 = 282 days from LMP.
Current Gestational Age = 105 days = 15 weeks, 0 days (Second Trimester).
Remaining days until Estimated Due Date = 282 - 105 = 177 days.
At 15 weeks gestation, the pregnancy has entered the second trimester (weeks 14 to 27), with the mid-pregnancy anatomy ultrasound typically scheduled between weeks 18 and 22.
Pregnancy Calculator Glossary of Key Terms
Days Elapsed Since First Day of LMP (Pregnancy Calculator)
Number of days from the start of your last period to today.
Average Menstrual Cycle Length (Days) (Pregnancy Calculator)
Typical cycle length (28 days is standard).
Basal Metabolic Rate (BMR)
The minimum daily energy your body expends at complete rest to sustain vital organ and cellular functions.
Total Daily Energy Expenditure (TDEE)
The total calories you burn in 24 hours combining Basal Metabolic Rate, food thermogenesis, and physical activity.
Lean Body Mass (LBM)
Total body weight minus adipose fat mass, comprising skeletal muscle, bone, water, and organs.
Visceral Adiposity
Deep abdominal fat surrounding internal organs that directly influences cardiometabolic health.
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Pregnancy Calculator Frequently Asked Questions
Q: Why is pregnancy counted from the Last Menstrual Period instead of conception?
Because the exact date of ovulation and fertilization is rarely known without ultrasound tracking, obstetrics standardizes gestational age from the first day of the last menstrual period (roughly 2 weeks before actual conception).
