LMP

How Many Months Pregnant Am I?

Enter the first day of your last menstrual period to find out how many months pregnant you are — the way people actually talk about pregnancy.

First day of your last menstrual period (LMP)

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months pregnant

💡 Pregnancy months don't divide evenly — each "month" is approximately 4.3 weeks. This calculator uses the standard obstetric week-based method to give you the most accurate month count.

Frequently Asked Questions

Why don't pregnancy months match calendar months?

Pregnancy is measured in weeks (40 total), not calendar months. Because months vary in length, the conversion is approximate — about 4.3 weeks per month. This is why your OB always refers to weeks, not months.

How many months is each trimester?

The first trimester is about 3 months (weeks 1–13). The second trimester is months 4–6 (weeks 14–27). The third trimester is months 7–9+ (weeks 28–40+).

Can I see my week count instead?

Yes — visit our Weeks Pregnant Calculator or our Days Pregnant Calculator for more detail.

Is this medical advice?

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