Pregnancy Due Date Calculator

What is a Pregnancy Due Date?

A pregnancy due date is an estimate of when a baby will likely be born. It is typically calculated as 40 weeks (or 280 days) from the first day of the last menstrual period (LMP). This date provides a guideline but is not exact since many factors can influence when labor begins.

How is the Due Date Calculated?

The due date is calculated based on the last menstrual period (LMP). The formula assumes a typical pregnancy lasts about 40 weeks:

• Add 280 days (40 weeks) to the first day of your last menstrual period.
• Alternatively, use the first ultrasound scan for a more accurate estimate if your cycle is irregular.

Use the calculator above to quickly determine your estimated due date.

What Factors Can Affect the Due Date?

The estimated due date is just a guideline. Several factors can influence the actual delivery date, such as:

• Irregular menstrual cycles.
• Ovulation timing and conception date.
• Complications like preterm labor or medical interventions.
• Multiple pregnancies (e.g., twins).

Why is Knowing Your Due Date Important?

Knowing your due date helps you and your healthcare provider plan for a healthy pregnancy. Key benefits include:

• Scheduling prenatal appointments and ultrasounds.
• Monitoring the baby's growth and development.
• Preparing for labor and delivery.
• Ensuring proper maternal nutrition and care.

Limitations of Due Date Calculations

Due dates are estimates and not exact predictions. Less than 5% of babies are born on their actual due date. The following factors highlight its limitations:

• Due dates assume a 28-day menstrual cycle.
• They may not account for individual variations in pregnancy length.
• External factors, such as stress or medical conditions, can influence delivery timing.