How accurate are pregnancy due date calculations?

Due date calculations are estimates based on average pregnancy length (280 days from LMP). Only about 5% of babies are born on their exact due date. Most babies are born within 2 weeks before or after the due date. This calculator provides estimates for planning purposes only.

What's the difference between calculating from LMP vs conception date?

Last Menstrual Period (LMP) is the most common method used by doctors, as it's easier to remember. Conception date is more precise but harder to determine exactly. Both methods are estimates, and actual conception can vary by several days.

When should I see a doctor about my pregnancy?

Contact a healthcare provider as soon as you suspect pregnancy, typically around 6-8 weeks from your last menstrual period. Early prenatal care is important for monitoring both mother and baby's health throughout pregnancy.

Are these calculations a substitute for medical advice?

No, this calculator is for informational purposes only. Pregnancy involves many individual factors that only a qualified healthcare provider can assess. Always consult with medical professionals for pregnancy care and monitoring.

The Only Tools I Need

Pregnancy Due Date Calculator

Calculate your pregnancy due date and track important milestones. Get an estimated timeline for your pregnancy journey based on your last menstrual period or conception date.

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Medical Disclaimer

This calculator provides estimates for educational and planning purposes only and is NOT 100% accurate. Actual pregnancy length varies significantly between individuals. These calculations are not a substitute for professional medical advice, diagnosis, or treatment. Always consult with qualified healthcare professionals for proper prenatal care, monitoring, and medical guidance throughout your pregnancy.

Calculation Method

Last Menstrual Period (LMP)Conception Date

First Day of Last Menstrual PeriodAverage Cycle Length (days)