My Pregnancy Calculator
My PregnancyCalculators & Guidelines
Advertisement

Ultrasound Due Date Calculator

Estimate your due date from your first trimester ultrasound (CRL).

Ultrasound Due Date Calculator

Estimate your due date from your first trimester ultrasound (CRL).

Ultrasound Due Date Calculator

Use your first-trimester CRL measurement and scan date to estimate your due date. Understand why the dating scan is the standard tool for early pregnancy dating.

On This Page

Jump to the explanation, questions, and references most relevant to this page.

Frequently Asked QuestionsReferences

Published: 2025-10-04 | Updated: 2025-10-04

Reviewed by: Dr. Priti Agarwal, MBBS, D.G.O

This page is designed to help you interpret timing, ranges, and measurements before or alongside clinical care.

Medical Disclaimer

This calculator is for educational use only. It cannot diagnose pregnancy, ovulation, fertility problems, fetal wellbeing, or complications. Use the result as a planning aid, then confirm next steps with your clinician if your dates are uncertain, your cycle is irregular, your symptoms are changing, or your ultrasound or treatment plan suggests something different.

Crafted by humans:
|
Fact-checked:

Estimate your due date from your first trimester ultrasound (CRL).

  1. Date of Ultrasound
  2. Crown-Rump Length (CRL)

The calculator will then estimate your due date and the gestational age at the time of the scan.

Why CRL Matters

CRL is the most accurate single ultrasound measurement for dating a pregnancy in the first trimester, especially between about 7 and 13 weeks. Later in pregnancy, clinicians use other measurements such as head size or femur length to assess growth, but those are not the inputs used by this calculator.

Important Medical Notes

This calculator is an educational tool to help you understand the data on your ultrasound report. The official due date used for your medical care is the one determined by your sonographer and confirmed by your doctor. Always use the EDD in your official medical records for scheduling and planning purposes.

Frequently Asked Questions