tools / pregnancy due date

Due date calculator.

Naegele’s rule from the first day of your last menstrual period. Estimated date of delivery, current week, trimester.

result

Enter the first day of your last menstrual period. Due date and progress appear here.

Pregnancy timeline

First trimesterWeeks 1 – 12

Morning sickness, fatigue, first ultrasound. Major organs form.

Second trimesterWeeks 13 – 27

Quickening (fetal movement), gender reveal possible, energy returns.

Third trimesterWeeks 28 – 40

Rapid growth, nesting instinct, prenatal classes, delivery prep.

How due dates are calculated

Naegele’s rule: add 280 days (40 weeks) to the first day of your last menstrual period. This is the convention used worldwide as a baseline.

Only ~5% of babies arrive on the exact due date.
Most arrive within two weeks before or after.
Ultrasound dating in the first trimester is more accurate; clinicians often adjust the estimate accordingly.
First-time mothers tend to deliver slightly later than the LMP-based estimate.

Disclaimer. Estimate using LMP. Your provider may revise based on early ultrasound. Always rely on professional dating for prenatal care decisions.

tools / pregnancy due date

Due date calculator.

Naegele’s rule from the first day of your last menstrual period. Estimated date of delivery, current week, trimester.

result

Enter the first day of your last menstrual period. Due date and progress appear here.

Pregnancy timeline

First trimesterWeeks 1 – 12

Morning sickness, fatigue, first ultrasound. Major organs form.

Second trimesterWeeks 13 – 27

Quickening (fetal movement), gender reveal possible, energy returns.

Third trimesterWeeks 28 – 40

Rapid growth, nesting instinct, prenatal classes, delivery prep.

How due dates are calculated

Naegele’s rule: add 280 days (40 weeks) to the first day of your last menstrual period. This is the convention used worldwide as a baseline.

Only ~5% of babies arrive on the exact due date.
Most arrive within two weeks before or after.
Ultrasound dating in the first trimester is more accurate; clinicians often adjust the estimate accordingly.
First-time mothers tend to deliver slightly later than the LMP-based estimate.

Disclaimer. Estimate using LMP. Your provider may revise based on early ultrasound. Always rely on professional dating for prenatal care decisions.

Due date calculator.

Calculate due date

Pregnancy timeline

How due dates are calculated

Due date calculator.

Calculate due date

Pregnancy timeline

How due dates are calculated