Pregnancy Calculator
Track pregnancy milestones week by week from your due date.
How pregnancy is dated
Clinicians count from the last menstrual period (LMP), not conception — so 'week 4' is only about two weeks after fertilization. Full term runs 39–40 weeks; a first-trimester ultrasound often refines the date by a few days and takes precedence over the LMP estimate.
Trimester landmarks
The first trimester (to 13 weeks) covers organ formation and most morning sickness; the second (to 27 weeks) usually brings energy back and the anatomy scan around week 20; the third is growth and lung maturation. Only ~4% of babies arrive exactly on their due date.
Related calculators
BMI Calculator
Check your body mass index and see where it falls on the healthy range.
Calorie Calculator
Find your daily calorie needs for maintenance, cutting, or bulking.
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method.
BMR Calculator
Calculate your basal metabolic rate — calories burned at rest.