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Due Date Calculator

Calculate your estimated due date and track pregnancy milestones. Supports multiple calculation methods.

Due Date Calculator

Calculate your estimated due date and pregnancy milestones

How to Use This Calculator

  1. 1

    Choose calculation method

    Select LMP (last menstrual period), conception date, or ultrasound due date.

  2. 2

    Enter the date

    Input the relevant date based on your chosen method.

  3. 3

    Adjust cycle length

    If using LMP, enter your average cycle length for more accuracy.

  4. 4

    View your results

    See your due date, current week, trimester, and pregnancy milestones.

Frequently Asked Questions

How is the due date calculated?

Using LMP, the due date is 280 days (40 weeks) from the first day of your last period. From conception, it's 266 days. These are estimates - only 5% of babies arrive on their due date.

What are the trimesters?

First trimester: weeks 1-12. Second trimester: weeks 13-26. Third trimester: weeks 27-40. Each trimester has different developmental milestones.

When should I see a doctor?

Schedule your first prenatal visit around 8 weeks. Contact your healthcare provider immediately if you experience severe pain, heavy bleeding, or other concerning symptoms.