How is a due date calculated?

Due dates are calculated using Naegele's Rule: add 280 days (40 weeks) to the first day of the last menstrual period (LMP). This assumes a 28-day cycle with ovulation on day 14. Ultrasound dating in the first trimester is the most accurate method for confirming gestational age.

What is the Bishop Score?

The Bishop Score assesses cervical readiness for labor induction using five factors: dilation, effacement, station, consistency, and position. A score ≥8 suggests a favorable cervix with a high likelihood of successful vaginal delivery. A low score may indicate the need for cervical ripening before induction.

What does the APGAR score measure?

The APGAR score is assessed at 1 and 5 minutes after birth, evaluating five criteria: Appearance (skin color), Pulse, Grimace (reflex irritability), Activity (muscle tone), and Respiration. Scores range from 0–10, with 7–10 considered reassuring.

Obstetric & Pregnancy Calculators

Pregnancy tools including due date calculator, Bishop Score, APGAR Score, gestational age calculator, contraction timer, and fetal weight estimator. Essential tools for prenatal care and labor assessment.

Due Date Calculator

Calculate your estimated due date (EDD) from your last menstrual period using Naegele's rule. Track gestational age and trimester.

Bishop Score

Calculate the Bishop Score to assess cervical favorability for labor induction. Predicts likelihood of successful vaginal delivery.

Apgar Score

Calculate the Apgar Score to quickly assess newborn health at 1 and 5 minutes after birth. Evaluates appearance, pulse, grimace, activity, and respiration.

Gestational Age

Calculate gestational age in weeks and days from the last menstrual period (LMP). Includes estimated due date using Naegele's rule.

Fetal Weight Estimate

Estimate fetal weight using the Hadlock formula from ultrasound measurements. Includes SGA/AGA/LGA classification by gestational age.

Contraction Timer

Time contractions during labor to track duration, frequency, and pattern for the 5-1-1 rule.

Apgar Timer

Live timer for Apgar scoring at 1 and 5 minutes after birth with real-time assessment.

Frequently Asked Questions

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