iPhone Screenshots


The VBAC Calculator is a convenient tool for predicting the success rate of a vaginal birth after cesarean (VBAC). The app consists of 3 calculators which use patient-specific data in order to generate a predictive score.

The "Standard" calculator uses the widely-used predictive model published in Grobman, William A., et al., “Development of a nomogram for prediction of vaginal birth after cesarean delivery,” Obstetrics & Gynecology, volume 109(4), pp. 806-812, 2007. This predictive model uses pre-pregnancy BMI and prior medical history to predict VBAC success rates. It can be used at any time during the term of pregnancy during a clinical visit.

The "Standard + Admission Factors" calculator is a variant of the 2007 Grobman prediction method as found in the following publication: Grobman William A., et al., “Does information available at the time of admission for delivery improve prediction of successful birth after cesarean?” American Journal of Perinatology, volume 26(10), pp.693-701, 2009. This model uses additional information at time of hospital admission to predict VBAC success rates.

Lastly, the "Simple" calculator also uses information at time of admission (same as the "Standard + Admissions Factors" calculator). The source for this predictive calculator is: Metz, Tori D., et al., “Simple, validated vaginal birth after cesarean delivery prediction model for use at the time of admission,” Obstetrics & Gynecology, volume 122(3), pp.571-578, 2013. This is a straight-forward prediction method that combines BMI and age information with the well-known Bishop Score calculation to determine VBAC success.

Please note that is app is provided solely for educational purposes and should not be used in lieu of sound, professional medical guidance.

What’s New

Version 1.1

UI improvements and bug fixes.

Ratings and Reviews

4.7 out of 5
6 Ratings

6 Ratings

PamChan2002MD ,

Great app and easy to use

Great app. Very straightforward to use, with a nice, intuitive interface. You can easily and quickly calculate the percent chance of a successful VBAC when counseling patients in the office. In addition, if you admit a patient in labor, you can use admission factors, like their cervical exam, to further refine their chance of success. Love it.


David Papandrew
12 MB

Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Infrequent/Mild Medical/Treatment Information
Infrequent/Mild Sexual Content and Nudity


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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