Due Date Calculator

Estimate pregnancy due date from LMP, conception, IVF transfer, or ultrasound data.

—Estimated due date
—Current stage
—Trimester

An estimate based on a 40-week (280-day) pregnancy. Only about 1 in 20 babies arrive on the exact due date — your doctor's dating scan is the most accurate guide.

Help Us Improve
4.9 (0)

How to use Due Date Calculator

Three quick steps — no sign-up needed

  1. Step 1

    Choose calculation method

    Select Last Menstrual Period (LMP), Conception date, IVF transfer date, or Last ultrasound - whichever data you have.

  2. Step 2

    Enter the matching dates and details

    For LMP include cycle length; for IVF choose 3-day or 5-day (blastocyst) transfer; for ultrasound enter scan date and gestational age.

  3. Step 3

    Read the estimated due date

    Use the result as an estimate. Your obstetric provider may adjust dates based on clinical findings.

Related Health & Wellness tools

View all
BMI Calculator Calculate your Body Mass Index and weight category from height and weight. BMR & Calorie Calculator Estimate basal metabolic rate and daily calorie needs from age, sex, size and activity. Body Fat Calculator Estimate body fat percentage using the US Navy circumference method. Bra Size Calculator Estimate bra band and cup size from underbust and bust measurements. Breathing Exercise Follow a guided breathing animation with box, 4-7-8, or calm timing patterns. Calorie Burn Calculator Estimate calories burned for common activities from weight and duration. Diabetes Risk Calculator Estimate 10-year type 2 diabetes risk using FINDRISC-style screening questions. Heart Rate Zone Calculator Estimate training heart-rate zones from age and optional resting heart rate.

About Due Date Calculator

Due Date Calculator estimates a pregnancy due date (EDD/EDC) from the information you actually have: last menstrual period, conception date, IVF transfer, or ultrasound gestational age. Searches like "pregnancy due date calculator", "LMP due date", and "IVF due date calculator" map to these methods.

Pick a calculation method, then fill the fields that appear - first day of last period and cycle length for LMP; conception or ovulation date; embryo transfer date and 3-day vs 5-day transfer; or ultrasound date with weeks and days. Only one pathway needs complete data.

Online dates are estimates. Cycle irregularity, late ovulation, and scan measurements can shift the clinical due date your midwife or doctor uses. Always follow the dating your prenatal care team records in your chart.

These results are educational estimates only and are not a medical diagnosis. Talk to a qualified clinician for personal health decisions. This tool does not replace prenatal care, viability assessment, or emergency advice for pain or bleeding.

Benefits of Due Date Calculator

Multiple dating methods LMP, conception, IVF transfer, and ultrasound paths in one place.
IVF-aware options 3-day and 5-day transfer choices for clinic-style dating.
Clear field guidance Only the inputs for your chosen method matter.
Shareable estimate A starting EDD to discuss at your first prenatal visits.

Frequently asked questions

How is due date calculated from LMP?

Typically about 280 days from the first day of the last menstrual period, adjusted when cycle length differs from 28 days.

Which method is most accurate?

Early ultrasound dating is often preferred clinically when available; your provider decides what goes on the record.

How do IVF transfer dates work here?

Choose IVF transfer, enter the transfer date, and select 3-day or 5-day (blastocyst) as applicable.

Can the due date change?

Yes. Clinicians may revise dates after scans or updated history.

Is this medical advice?

No - an educational estimate. Rely on your prenatal care team for official dating and care.