Calculate Your Due Date Using Ultrasound
Ultrasound scans are one of the most accurate ways to estimate how far along your pregnancy is. During the first trimester, your baby's size and development follow a predictable pattern, allowing healthcare providers—and tools like Lunara’s—to deliver a reliable estimation of your due date based on ultrasound.
By using our tool, you can easily calculate your due date from an ultrasound report, regardless of whether you remember your last period. For women with irregular cycles or unclear ovulation dates, our pregnancy calculator using ultrasound date can be especially useful in tracking pregnancy milestones with greater confidence.
Is Your Due Date Determined by Your Last Period or Ultrasound?
Many pregnancy calculators use the first day of your last menstrual period (LMP) to estimate your due date. This method assumes a textbook 28-day cycle with ovulation occurring on day 14. However, in reality, only a small percentage of women have such regular cycles. Hormonal fluctuations, stress, medical conditions, or recent birth control use can all impact your cycle, making LMP-based calculations less dependable.
This is where the due date calculator according to ultrasound becomes more relevant. Early ultrasound measurements—particularly in the first trimester—provide a more consistent and accurate estimate of gestational age, especially when compared to LMP. If you’re unsure of your cycle, Lunara’s due date calculator with ultrasound offers a smarter way forward.
When Is the Best Time for an Ultrasound to Predict Due Date?
Timing matters when using an ultrasound conception calculator. The first trimester—between weeks 7 and 13—is widely considered the best window for a dating scan. At this stage, all embryos grow at a similar rate, and the crown-rump length (CRL) measurement offers a dependable way to estimate gestational age.
Ultrasounds performed later in pregnancy can still help estimate due dates but are slightly less accurate as babies begin to grow at varying rates. For the most precise result using a due date calculator based on ultrasound, aim to input data from a first-trimester scan when possible.
How to Calculate Your Due Date Using Ultrasound
Using Lunara’s tool is simple and intuitive. To calculate your due date using ultrasound, you’ll need:
• The exact date of your ultrasound scan
• The gestational age (weeks) recorded during the scan, expressed in weeks
• The additional days of gestation beyond the completed weeks
Once you enter this information into our system, the ultrasound calculator pregnancy tool will process your data instantly. It then estimates the expected date of delivery by ultrasound, based on standard growth charts and clinical guidelines.
This method is particularly helpful for women who conceived after irregular cycles, experienced early miscarriage before, or weren’t tracking ovulation.
How Our Due Date by Ultrasound Calculator Works
Our due date calculator by ultrasound uses clinical algorithms based on widely accepted obstetric standards. It calculates your estimated due date (EDD) by adding the measured gestational age from your scan to the date of the ultrasound and then projecting forward to the standard 40-week term.
Here’s why Lunara’s calculator stands out:
• Browser-based: No downloads or data collection
• Private: All calculations are done locally in your browser
• Fast and accurate: Results generated in seconds
Whether you're aiming to calculate your due date using ultrasound or estimate when conception occurred, Lunara offers a trusted tool without the noise.
Common Concerns with Ultrasound-Based Calculations
Why You Might Not See the Baby in an Early Scan
Early ultrasounds before week 6 may not clearly show the embryo. That doesn’t necessarily mean there’s a problem. The embryo could still be developing, or your dates may be off slightly. A follow-up scan in 7–10 days often provides better clarity. In such cases, your due date calculator with ultrasound may be updated based on new measurements.
Can Your Due Date Change After an Ultrasound?
Yes, it's possible. Your initial due date may be adjusted if a scan shows that your baby is smaller or larger than expected for gestational age. This is especially common when relying on LMP alone. An early scan used with the due date calculator according to ultrasound typically offers the most consistent EDD, but adjustments might occur during follow-ups.
How Ultrasound Helps Estimate Conception Date
While it's not exact, ultrasound can give a close estimate of your conception date. If your gestational age is determined to be 8 weeks on the scan date, your likely conception occurred around 6 weeks earlier (two weeks into pregnancy is considered conception). Using the ultrasound conception calculator, you can better understand your early pregnancy timeline—even if your LMP is unknown or unreliable.
Why Women Prefer Lunara’s Due Date Calculator by Ultrasound
At Lunara, we prioritise what matters most to expecting mothers: accuracy, simplicity, and privacy. Our due date calculator by ultrasound was built with empathy and science in equal measure. Here’s what sets us apart:
• No sign-ups or data storage: Your input is not saved or shared
• User-friendly design: Easy to navigate on any device
• Evidence-based results: Our tool uses standard medical formulas trusted by professionals
From those planning ahead to first-time mums seeking peace of mind, our due date calculator based on ultrasound empowers you with clarity from the start.
Try the Lunara's Due Date Calculator by Ultrasound Today
Ready to find out when your baby might arrive? Use Lunara’s due date calculator with ultrasound and gain a more accurate picture of your pregnancy journey. Whether you're looking to calculate your due date from an ultrasound report or better understand your pregnancy calculator ultrasound date, our tool is here to guide you—securely and effortlessly.
Let Lunara walk with you from scan to delivery—one accurate estimate at a time.