Pregnancy Week by Week Calculator

Track your pregnancy timeline, estimate your due date, and see your baby’s fruit-size comparison week by week.

Pregnancy Week by Week Calculator | Due Date & Baby Size | Koaiv

Pregnancy Week by Week Calculator

Track your pregnancy timeline, estimate your due date, and see your baby’s fruit-size comparison week by week.

Use the first day of your most recent menstrual period.
This calculator provides an estimated week-by-week timeline based on a standard 40-week pregnancy. Actual dating and milestones can vary depending on cycle length, conception timing, and medical assessment.

How to Use This Calculator

  • 1

    Enter the first day of your last period, or use your estimated due date.

  • 2

    Click calculate to estimate your current week and upcoming milestones.

  • 3

    Use the result as a helpful guide, not a clinical diagnosis.

  • 4

    Always confirm important dates with your healthcare provider.

How to Read This Result

This tool gives you an estimated pregnancy timeline based on standard pregnancy dating. It helps you understand where you are now, what stage comes next, and when some important milestones may happen.

  • Due dates are estimates, not exact predictions

  • Cycle length and conception timing can change results

  • Ultrasound dating may differ from LMP-based estimates

  • Use this as a planning guide, not a substitute for medical advice

What These Milestones Mean

  • First Trimester
    A season of rapid early development and often the most uncertainty.

  • Anatomy Scan
    A common mid-pregnancy ultrasound used to look more closely at baby’s growth and development.

  • Third Trimester
    A stage of faster growth, preparation, and increasing anticipation

  • Estimated Due Date
    A useful reference point, but many babies arrive before or after it.

Baby Development Milestones

From Newborn to One Year

Explore more

Newborn Baby Essentials Checklist

Preparing Your Home for the Arrival of Baby

Explore more

Why Is the First 3 Months Called the Fourth Trimester?

Welcome to the fourth trimester

Explore more

Disclaimer: The information provided in this article is for general knowledge and informational purposes only, and does not constitute medical advice. It is essential to consult with a qualified healthcare professional for any health concerns or before making any decisions related to an infant’s health, diet, or treatment. Individual circumstances may vary, and professional guidance is necessary for personalized recommendations. Information may change with new research, and readers assume all risks associated with using this information. The author/provider is not responsible for actions taken in reliance on this information.

Need More Support?

If articles and tools still leave questions open, you do not have to figure it out alone.