Bishop Score Calculator

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Bishop Score Calculator

The Bishop Score (also known as Pelvic Score) is the most commonly used method to rate the readiness of the cervix for induction of labor. The Bishop Score gives points to 5 measurements of the pelvic examination dilation, effacement of the cervix, station of the fetus, consistency of the cervix, and position of the cervix.  The calculator below will calculate a  Bishop score


0 1 2
Dilation (cm)


1-2 cm


 5 - 6cm 

Effacement (%)








-1, 0

+1, +2 





Position Posterior

                                                             BISHOP'S SCORE

The Bishop’s score was originally developed to predict the likelihood of a woman   entering labor naturally in the near future. A woman with a low score of 1  would not expected go into  labor  for about 3 weeks. A woman with a higher score score of 10  could  be expected to go into labor within a few days. 

Although the Bishop’s score was originally used to evaluate the likelihood of vaginal delivery in women who have  given birth before (multiparous) it is also now used for women who have never given birth (nulliparous)  who are being considered for induction of labor.

 If the Bishop score is 8 or greater the chances of having a vaginal delivery are good and the cervix is said to be favorable or "ripe" for induction.   If the Bishop score is 6 or less  the chances of having a vaginal  delivery are low and the cervix is said to be unfavorable or "unripe" for induction.

A simplified Bishop score using only dilation, station and effacement may be as  predictive of successful induction as the original full Bishop score. A simplified Bishop score of  5 had a similar predictive value of having a successful  vaginal delivery as an original Bishop score of  greater than 8.

How The Points Are Assigned

Dilatation  Penny in pixels(Dilation)
The most important element of the Bishop score is dilatation. Dilatation is the distance the cervix is opened measured in centimeters (cm) . For reference a penny is about 2 cm across. Points are given from 0  to  a maximum of 3 points for a cervix dilated to 6 cm or greater.


Cervical dilation to 6 centimeters


 Effacement (also called shortening or thinning)  is reported as a percentage from zero percent (normal length cervix) to 100% or complete (paper thin cervix). Points are given from 0 to a maximum of 3 points for a cervix effaced to 80 % or greater.


Image credit:  National Institutes of Health 2011.


Station is the position of the baby's head relative to the bony projections of the lower pelvis called the ischial spines. When the baby's head is at 0 station its head  is even with the ischial spines. Stations divides the pelvis above and below the ischial spines into 3rds Negative numbers indicate that the head is above the ischial spines. Positive numbers indicate its head is below the ischial spines.

Points are given from 0 to a maximum of 3 points for a station of 1 + or 2+. 

 Fetal station  
(c) LifeART / Stock Photography

In 1988, the American College of Obstetricians and Gynecologists redefined station as the level of the leading bony point of the fetal head at or below the level  of the maternal ischial spines measured in centimeters  (0–5 cm).


The texture of the cervix on examination.
Firm : The cervix feels hard and rubbery .
Medium: The cervix feels compressible but not soft
Soft : The cervix feels mushy


The position of the cervix relative to the fetal head and maternal pelvis

Position of cervix bisop score

Reviewed by Mark Curran, M.D. FACOG


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2. .ACOG Practice Bulletin No. 107: Induction of labor.ACOG Committee on Practice Bulletins -- Obstetrics.Obstet Gynecol. 2009 Aug;114(2 Pt 1):386-97. PMID: PMID: 19623003
3. Crane JM. Factors predicting labor induction success: a critical analysis. Clin Obstet Gynecol. 2006 Sep;49(3):573-84. PMID: 16885664
4. Spong CY, et. al. Preventing the first cesarean delivery: summary of a joint Eunice Kennedy Shriver National Institute of Child Health and Human Development, Society for Maternal-Fetal Medicine, and American College of Obstetricians and Gynecologists Workshop. Obstet Gynecol. 2012 Nov;120(5):1181-93. PMID: 23090537
5. Laughon SK, et. al., Using a simplified Bishop score to predict vaginal delivery Obstet Gynecol. 2011 Apr;117(4):805-11. doi: 10.1097/AOG.0b013e3182114ad2. PMID: 21383643
6.Obstetric Forceps, ACOG committee opinion, no. 59. Washington DC: American College of Obstetricians and Gynecologists 1988
7. Cunningham FG, Leveno KJ, Bloom SL, et al: Normal Labor and Delivery. In Williams Obstetrics, 23rd ed., p 392 2010
8.Xenakis EM, et al., Induction of labor in the nineties: conquering the unfavorable cervix.
Obstet Gynecol. 1997 Aug;90(2):235-9.PMID: 9241300

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