health calculator
Track pregnancy timeline and weekly milestones.
Save this page to watch your weekly milestones and track progress throughout your pregnancy.
Current week
Week 20
Formula
Progress = days pregnant / 280 daysPregnancy progress is estimated from completed weeks and days against a common 40-week timeline.
Step by step
Example
At 20 weeks and 3 days, pregnancy is a little over halfway through the standard 40-week timeline.
Related guides
Guide
Learn how pregnancy due dates are calculated using Naegele rule, ultrasound dating, and conception dates. Understand due date accuracy and gestational age.
Guide
Understand conception timing, how sperm and egg viability affect fertility windows, and how to use ovulation tracking for planning or preventing pregnancy.
Summary
Current week
Week 20
Gestational progress.
Trimester
Trimester 2
Current pregnancy phase.
Days remaining
137 days
Time to delivery.
Percent complete
51.1%
Gestational completion.
D3 visualization
Track the completed percentage of the standard 280-day gestational cycle.
D3 visualization
See where you stand along the three standard trimester phases of full-term pregnancy.
Guide
Pregnancy progress is calculated from the first day of the last menstrual period (LMP) and typically spans 40 weeks (280 days). The timeline is divided into three distinct phases called trimesters, each marking key stages of fetal development and parental changes.
Trimester 1 covers weeks 1 through 12, Trimester 2 runs from week 13 to 27, and Trimester 3 encompasses week 28 through delivery.
The trimester milestones help divide the journey into manageable developmental blocks. This calculator tracking tool shows your completed weeks, remaining days, and percentage of the standard timeline completed.
Gestational age
The age of the pregnancy measured in completed weeks from the last menstrual period.
Due date
The estimated date of delivery, calculated as 280 days after the last period started.
LMP
Last Menstrual Period, the standard starting baseline for pregnancy dating.
Because the exact date of conception is often difficult to pinpoint. Measuring from the last menstrual period provides a consistent, universally accepted starting marker.
No. Only about 4% of babies are born on their scheduled due date. Most are born within a two-week window before or after.