Pregnancy Due Date Calculator
Calculate your estimated due date using LMP or conception date, then view a clear pregnancy timeline and export a privacy-safe summary.
Results summary
Enter a date to generate your personalized timeline.
Pregnancy timeline
Enter a date to generate your personalized timeline.
Export timeline
Due date calculator overview
A due date calculator estimates the expected delivery date using the first day of the last menstrual period (LMP) or an equivalent conception date. This tool converts your input into a gestational timeline so you can see the pregnancy week, approximate milestones, and overall progress at a glance. It is intended to support planning and general understanding rather than replace clinical care.
Because pregnancy dating is typically described in gestational weeks, most calculators follow a standard 280‑day model. That model provides a consistent starting point for comparing timelines, even though individual pregnancies can vary. The output here is a general estimate and should always be discussed with your clinician if you need medical guidance.
Use the estimate as a reference when organizing personal plans, tracking general milestones, and preparing questions for appointments. If you are ever uncertain about dates or expectations, a qualified health professional should be your primary source of guidance.
Why LMP and conception dates are used
Pregnancy dating commonly starts from the first day of the last menstrual period, even though conception typically occurs about two weeks later. Using LMP gives a standardized reference point for estimating gestational age, scheduling routine visits, and communicating timeline expectations across providers.
If you only know the conception or ovulation date, the calculator converts it into an equivalent LMP by subtracting 14 days. This aligns your timeline with the same gestational framework used for LMP‑based dating. While individual physiology varies, this approach is widely used for general estimation.
Some people receive clinical dating based on ultrasound. If that happens, consider the ultrasound date as your authoritative timeline and use this calculator as a helpful comparison rather than a final answer.
Cycle length adjustments
Not everyone has a 28‑day cycle. If your cycle is longer or shorter, the estimated due date shifts by the difference from the 28‑day baseline. For example, a 30‑day cycle moves the estimated due date about two days later, while a 26‑day cycle moves it about two days earlier.
This adjustment helps align the estimated timeline with your own cycle length while preserving the 280‑day gestational model. It does not replace ultrasound dating or clinical judgment, but it can improve the accuracy of a general estimate for personal planning.
If your cycles are irregular, or you are unsure about your typical length, you can still use the calculator with the default value and discuss any uncertainty with your clinician.
Gestational age and week counting
Gestational age is presented as weeks and days. A reading of 12w 3d means twelve full weeks have elapsed and three additional days have passed. This is calculated from the reference LMP date and updated based on your local date.
Clinicians may adjust gestational age based on ultrasound measurements or medical history. If your provider has given you a specific due date, use that as the authoritative timeline. This calculator is a consistent reference tool rather than a substitute for medical evaluation.
When sharing information with others, it can be helpful to mention both your due date and your gestational week, since these are common ways of describing pregnancy progress.
Understanding the pregnancy timeline
The timeline presents common prenatal milestones in week ranges. Each node shows a week range, an estimated date range, and a status (past, current, or future). These milestones are based on a general U.S. schedule and are not individualized to your care plan.
After 36 weeks, the timeline focuses on broader stage prompts because visit frequency and monitoring often change in late pregnancy. Use the timeline as a guide for planning and conversation, not as a definitive schedule.
If your clinic provides a different visit schedule or milestone timing, follow their guidance. The timeline is meant to be informational and adaptable.
Days remaining and days elapsed
Days remaining reflects the number of days between today and the estimated due date. Days elapsed counts the number of days since the reference LMP date. These metrics help you track progress through the 280‑day framework.
If you receive updated clinical dating, the day counts here may differ. In that case, treat this tool as a general reference and follow the guidance provided by your clinician.
Because the calculation uses your local date, the counts update daily. This makes the timeline useful for regular check‑ins without requiring manual recalculation.
Privacy‑focused export
The export feature produces a 9:16 PNG that is easy to share or print. Privacy mode is on by default. When enabled, the export hides your input dates and only includes the estimated due date and gestational progress.
This makes it possible to share a timeline without revealing sensitive dates. You can turn privacy mode off if you want the full date ranges included in the image.
Use the exported image for personal reminders, sharing with family, or keeping a non‑medical summary. It is not intended for clinical documentation.
How to use this tool with clinical care
This calculator is designed for planning, education, and communication. It helps you visualize the overall pregnancy timeline and prepare for typical milestones. It does not provide diagnosis, treatment recommendations, or individualized medical advice.
If you have questions about your dates, symptoms, or schedule, consult a qualified health professional. Your clinician’s guidance should always take priority over general calculators.
Bring the timeline to appointments if it helps you ask questions or organize information, but rely on your care team for decisions about tests and timing.
Limitations and reminders
Every pregnancy is unique. Variations in cycle length, ovulation timing, and clinical findings can change estimated dates. This tool provides a standardized estimate for general use.
Use the results as a reference point, and rely on medical professionals for decisions about care.
If you are concerned about symptoms or milestones, do not wait for an app or calculator—seek clinical guidance.