Calculadora de Fecha Probable de Parto
Estima tu fecha de parto basándote en tu último período menstrual (UPM). Usa la regla de Naegele: UPM + 280 días.
Fecha Estimada de Parto
Semana
Semana Actual
w d
Días Restantes
Trimestre
Concepción Est.
Esta calculadora usa la regla de Naegele (UPM + 280 días). Las fechas reales de parto pueden variar. Por favor consulta a tu médico para estimaciones precisas.
Frequently Asked Questions
How is a pregnancy due date calculated?
The due date is calculated by adding 280 days (40 weeks) to the first day of the last menstrual period (LMP). This is known as Naegele's rule. Only about 5% of babies are born exactly on their due date; most arrive within two weeks before or after.
What are the three trimesters of pregnancy?
The first trimester spans weeks 1–12, the second trimester covers weeks 13–26, and the third trimester is weeks 27–40. Each trimester has distinct developmental milestones and different prenatal care recommendations.
How accurate is a due date calculator?
A due date based on LMP is an estimate. Only 4–5% of babies arrive on the exact due date. An ultrasound in the first trimester can provide a more accurate estimate, typically within 5–7 days. About 80% of babies are born between weeks 38 and 42.