Calculadora de Fecha Probable de Parto

Calcula tu fecha probable de parto según tu último período o fecha de concepción. Resultado inmediato, gratis y privado.

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Enter Your Information

First day of last period:

Average cycle length (days):

Your Pregnancy Timeline

Estimated Due Date

Current Week

Days Pregnant

Trimester Breakdown

First Trimester

Second Trimester

Third Trimester

Important Milestone Dates

8 Weeks Pregnant

12 Weeks Pregnant

20 Weeks Pregnant

40 Weeks Pregnant

Important Notes:

Due dates are calculated using Naegele's rule (280 days from LMP)
Only 5% of babies are born on their exact due date
Most babies are born within 2 weeks before or after the due date
Your healthcare provider may adjust the due date based on ultrasound measurements

How Due Date Calculation Works

Last Menstrual Period

We use the first day of your last period as the starting point for pregnancy calculation.

Naegele's Rule

Add 280 days (40 weeks) to your LMP date to get your estimated due date.

Trimester Calculation

Pregnancy is divided into three trimesters of approximately 13-14 weeks each.

Your Privacy is Protected

This calculator runs entirely in your browser. No data is sent to our servers or stored anywhere. Your personal information stays private.

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