LMP

How Many Days Pregnant Am I?

Enter the first day of your last menstrual period to get the exact number of days you've been pregnant, plus your week count and trimester.

First day of your last menstrual period (LMP)

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days pregnant

💡 Day count starts from your LMP date, which is standard in obstetric dating — even though conception typically occurs around day 14.

Frequently Asked Questions

Why does pregnancy count start from my last period?

Obstetric dating begins with the LMP because the exact date of conception is rarely known. This gives a consistent, universal starting point that providers and parents can rely on.

How many days is a full-term pregnancy?

A full-term pregnancy is typically 280 days (40 weeks) from LMP. Babies born between days 259–294 (37–42 weeks) are considered full-term.

Can I also see my weeks?

Yes! Try our Weeks Pregnant Calculator for a week-and-day breakdown, or see your Trimester.

Is this medical advice?

No — this tool is for informational purposes only. Always follow the guidance of your doctor or midwife.