How accurate is the due date?

Only about 5% of babies are born on their exact due date. Most births occur within 2 weeks before or after the calculated due date. Your doctor may refine the date based on ultrasound measurements.

Yes, completely. All calculations are done in your browser. No data is sent to any server.

Pregnancy Due Date Calculator

Calculate from:

Last Menstrual Period (LMP) Conception Date Ultrasound Date

First Day of Last Menstrual Period:

Weeks Pregnant at Ultrasound:

Estimated Due Date

—

Weeks Pregnant

—

Trimester

—

Days Until Due

—

days remaining

Conception Date

—

estimated

Pregnancy Progress

Week 1 Week 13 Week 27 Week 40

Key Pregnancy Milestones

How to Use

Choose your calculation method: LMP date, conception date, or ultrasound date.

Enter the date and click Calculate Due Date.

View your due date, current trimester, and key milestones at a glance.

Features

Three calculation methods: LMP, conception date, or ultrasound scan date
Instant results: due date, weeks pregnant, trimester, and conception estimate
Visual pregnancy progress bar with trimester markers
Key milestone calendar: first heartbeat, anatomy scan, viability, full term
100% private — no data leaves your browser, no account required

Use Cases

First-time parents wanting to know when their baby will arrive
Planning maternity leave and parental leave schedules
Tracking pregnancy progress week by week
Checking key prenatal care appointments and milestones
Healthcare providers performing quick patient due date estimates

FAQ

How is the due date calculated?

The standard method (Naegele's rule) adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). If using conception date, we add 266 days (38 weeks). Ultrasound dates allow back-calculating the LMP equivalent.

How accurate is this due date?

Only about 5% of babies are born on their exact due date. Most births occur within 2 weeks before or after. Your healthcare provider may adjust the date based on ultrasound measurements.

What are the three trimesters?

First trimester: weeks 1–12. Second trimester: weeks 13–27. Third trimester: weeks 28–40. Each trimester involves different developmental stages and prenatal care needs.

Is my data private?

Yes, completely. All calculations happen entirely in your browser with JavaScript. No health data is ever sent to any server.

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