Pregnancy Due Date Calculator
Pregnancy Conception Calculator
Estimate your exact date of conception, identify the 6-day intercourse fertility window, and trace key developmental pregnancy milestones from LMP, ultrasound, or due date.
Calculation Inputs
Dates calculated are estimates only, assuming standard follicular development and ovulation lengths. Early ultrasound scans performed in the first trimester remain the clinical gold standard for establishing true gestational age. Always consult your obstetrician for clinical decisions.
Estimated Conception Date
June 4, 2026
Probable Conception Fertile Window
May 30, 2026 – June 4, 2026
Intercourse during these dates likely led to fertilization, factoring in the life cycle of sperm and egg.
Due Date (EDD)
February 25, 2027
Gestational Age
6 Weeks, 0 Days
Days Remaining
238 Days
Developmental Milestones Calendar
| Milestone Event | Gestational Age | Target Date | Status |
|---|---|---|---|
Last Menstrual Period (LMP) Gestational dating clock begins based on reference period cycle. | Start | May 21, 2026 | Completed |
Estimated Conception Fertilization of the egg by sperm in the fallopian tube. | 2 Weeks | June 4, 2026 | Completed |
Blastocyst Implantation Embryo attaches tightly to the uterine lining. | 3.2 Weeks | June 13, 2026 | Completed |
Neural Tube Closes Early brain and spinal cord form and fuse shut. | 4 Weeks | June 18, 2026 | Completed |
Fetal Heartbeat Heartbeat is detectable on early ultrasound. | 6 Weeks | July 2, 2026 | Completed |
Embryo to Fetus Transition Basic organogenesis complete. Organ systems start working. | 10 Weeks | July 30, 2026 | Upcoming |
Anatomical Screening Window Mid-pregnancy ultrasound to check structural developments. | 19 Weeks | October 1, 2026 | Upcoming |
Fetal Viability Medical threshold of potential survival outside the womb. | 24 Weeks | November 5, 2026 | Upcoming |
Full Term Status Baby's lungs and brain are fully mature for safe birth. | 37 Weeks | February 4, 2027 | Upcoming |
Estimated Due Date (EDD) Estimated completion of 40 weeks gestation. | Due Date | February 25, 2027 | Upcoming |
How is the conception date calculated from a known due date?▾
Can an ultrasound scan determine my exact conception date?▾
What is the conception window?▾
How Pregnancy Calculator Works
Our high-performance online utility runs entirely client-side, processing your files securely and instantly inside your web browser. For related functions, you can also use our Conception Calculator and Weight Gain Calculator utilities.
Enter LMP Date
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Or Conception Date
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Get Due Date
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Trimester Milestones
Designed for professional results, privacy, and maximum compatibility across all modern desktop and mobile browsers:
First Trimester
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Second Trimester
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Third Trimester
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Gestational Age
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Frequently Asked Questions About Pregnancy
Is this pregnancy calculator free?
Yes. Calculate due dates and milestones with no registration.
Which dates can I enter?
Last menstrual period, conception date, or ultrasound date for accurate predictions.
Are trimester dates accurate?
Yes. Standard 40-week pregnancy with 3-trimester milestone tracking.
Do you store pregnancy data here?
No. All calculations happen locally with complete privacy.