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Rx Med Calculator

Visit Rx Med Calculator
Meet the founder

Calculate EDD, gestational age, scan dating, IVF milestones, fetal biometry, and pregnancy milestones with a free online OB Wheel.

Rx Med Calculator in useRx Med Calculator screenshot 2
Listed
Categories
Automation,Health,Education
Runs on
Web, macOS, Windows, Linux, iOS, Android
Pricing
Free

About Rx Med Calculator

**RxMedCalc OB Wheel — A Complete Digital Pregnancy Wheel for Clinicians**

The RxMedCalc OB Wheel is a free, clinical-focused digital alternative to the traditional obstetric wheel.

Calculate **estimated due date (EDD), gestational age, and pregnancy milestones** from LMP, ultrasound dating, IVF/embryo transfer, or a specific calendar date. The calculator also includes reverse EDD → LMP dating for situations where only the due date is available.

Beyond basic pregnancy dating, the tool provides quick access to:

• EDD and gestational age by LMP • Gestational age and EDD from ultrasound dating • IVF/ART pregnancy dating and milestones • Gestational age on any specific date • Reverse EDD → LMP calculation • Week-by-week pregnancy milestones • CRL, BPD, HC, AC and FL reference values • Approximate fetal weight by gestational age • Antenatal test and screening schedule • Trimester-wise pregnancy precautions • β-hCG reference ranges

Designed for **doctors, obstetricians, residents, midwives, medical students, and healthcare professionals**, RxMedCalc brings the information traditionally found on both sides of a physical OB wheel into one fast, accessible web tool.

**Free. No login required. Fast and easy to use.**

🔗 https://rxmedcalc.com/medical-calculators/obs-calc

*For clinical decision support only. Always interpret calculator results alongside the patient's clinical findings and current guidelines.*

What Rx Med Calculator does that nothing else does

free medical calculator without any login or signup.

Who Rx Med Calculator is for

pregnant females, clinician medical staff and anyone with need of medical calculators.

Written up on SpacerrApps

What Rx Med Calculator Does for Pregnancy DatingSee how Rx Med Calculator handles pregnancy dating, IVF milestones, fetal measurements and screening references, and where clinical judgment remains essential.August 12, 2026 · 4 min read

9 comments

  1. Marta Vidal

    Which ultrasound measurements can I enter for scan dating, and does the tool adjust the EDD based on the scan result?

  2. Dan Whitfield

    Can I calculate gestational age from a specific calendar date without entering an LMP or EDD?

    1. Dr Diamond SharmaMaker

      yes you can use any date to calculate. Just enter the date as LMP and it will work

  3. Jonah Petersen

    How is the antenatal test and screening schedule organized, and can I view it by trimester?

  4. Owen Fitzgerald

    Are the fetal biometry and weight values shown as reference ranges, and can I switch between metric and imperial units?

  5. Marco Bellini

    Can I use the reverse EDD to LMP tool when the due date comes from an ultrasound rather than the last menstrual period?

    1. Dr Diamond SharmaMaker

      yes you can use . try it out here https://rxmedcalc.com/medical-calculators/obs-calc https://rxmedcalc.com/medical-calculators/reverse-due-date-calculator Just use the date date as per USG

  6. Hana Suzuki

    Does the calculator adjust IVF dating based on the embryo’s age at transfer, and can results be saved or shared across devices?

    1. Dr Diamond SharmaMaker

      yes it does adjust the dated on the embro age and results can be shared and printed to keep as record.

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