Labor Induction Calculator

Important Information Regarding this Calculator:

This calculator is intended for use among women undergoing a full term (≥37 weeks) induction of labor with an unfavorable cervix (modified Bishop score ≤6 and cervical dilation ≤2cm), singleton gestation, intact membranes, and no prior history of cesarean delivery. The calculator has not been evaluated for use in other populations.

* All fields need to be selected in order to calculate probability of cesarean delivery.

Select maternal height (inches):


Select BMI (kg/m²) at delivery category:


Is the patient nulliparous?


Is the gestational age at induction ≥ 40 weeks?


Modified Bishop Score prior to induction


Probability of cesarean delivery:

Please see the following paper for suggestions on how this calculator can be used in clinical care : Levine et al. A validated calculator to estimate risk of cesarean after an induction of labor with an unfavorable cervix. Am J Obstet Gynecol 2017 Dec 7. pii: S0002-9378(17)32474-2. doi: 10.1016/j.ajog.2017.11.603. [Epub ahead of print]