Rx Med Calc
Free evidence-based clinical calculators for healthcare prof
RxMedCalc, a free medical calculator platform for healthcare professionals in India, today announced the launch of its OB Wheel Calculator, a digital version of the traditional obstetric wheel used by clinicians for decades to date pregnancies and track fetal development.
The new tool, available at rxmedcalc.com/medical-calculators/obs-calc, allows doctors and nurses to calculate estimated due date (EDD), gestational age, and trimester from the last menstrual period, with support for cycle-length adjustment, ultrasound-based dating, IVF transfer dating, and reverse EDD-to-LMP calculation for reviewing referral notes.
Beyond basic dating, the calculator displays expected fetal biometry (CRL, BPD, HC, AC, FL) by gestational week using Hadlock growth references, a full prenatal test and screening schedule, trimester-wise precautions, and a quantitative beta-hCG dating chart — reproducing the reference data traditionally printed on the back of a physical OB wheel, in one digital tool with Due date calculator
The OB Wheel joins more than 60 free clinical calculators already live on RxMedCalc (rxmedcalc.com), covering obstetrics, nephrology, cardiology, hepatology, and general clinical practice. All tools are free, require no login, and are designed for point-of-care speed.
"The goal was to take something every obstetric ward already relies on — the physical OB wheel — and make it faster and more complete without adding any friction for the clinician," said a spokesperson for RxMedCalc.
RxMedCalc is built and maintained for the Indian clinical community, with calculations aligned to FOGSI, ACOG, and WHO guidelines.
Features
1. It's built specifically around Indian obstetric guidelines (FOGSI, ACOG, WHO) and includes the DIPSI gestational diabetes screening protocol used in Indian clinical practice — most international OB wheel/due-date tools are built around Western protocols and miss this entirely.
2. It goes beyond a basic due-date calculation by combining five dating methods (LMP with cycle-length adjustment, ultrasound scan dating, IVF transfer date, reverse LMP calculation, and gestational age on any specific date) with expected fetal biometry by week (using Hadlock growth references) and the full antenatal test/screening schedule — replicating everything printed on a physical OB wheel, in one page, rather than requiring separate lookups.
3. It's completely free, requires no login or account, and loads fast enough for use at the point of care — built by a practicing doctor at a government clinic in India who uses it in daily antenatal visits, not by a marketing team guessing at clinician workflow.
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