Bishop Score Calculator

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How open the cervix is. Measured in centimetres during a digital vaginal examination.
How much the cervix has thinned and shortened. 0% is a thick, long cervix; 100% is paper-thin.
Position of the fetal presenting part relative to the maternal ischial spines. Negative = above spines; positive = below.
How soft or firm the cervix feels on palpation. A softer cervix scores higher.
Where the cervical os points. Anterior (toward the pubic symphysis) scores highest.
The Modified Bishop Score replaces effacement percentage with measured cervical length, which some clinicians find more reproducible.
Each prior vaginal delivery adds 1 point to the score per standard modifier guidelines.
Pre-eclampsia adds 1 point to the Bishop score.
Post-dates pregnancy subtracts 1 point from the Bishop score.
Bishop ScoreUnfavorable cervix
5

Sum of all five cervical parameters (plus any active modifiers)

Base Score (before modifiers)5
Modifier Points0
Maximum Possible Score13
Cervix StatusUnfavorable - induction unlikely to succeed without ripening
5 pts
Unfavorable<6Intermediate6-8Favorable8+

Bishop Score: 5 out of 13 (38%).

  • A score of 5 or below indicates an unfavorable cervix. Cervical ripening before induction is typically recommended.
  • Common ripening methods include prostaglandin gels or tablets (misoprostol, dinoprostone) or a transcervical balloon catheter.
  • First-time mothers (nulliparous) generally have a lower baseline score; a threshold of 8 is often required before induction for this group.
  • The Bishop score is one tool in a clinical assessment: gestational age, indication for induction, fetal well-being, and local protocols all influence the decision.

Next stepDiscuss cervical ripening options with your obstetric provider before scheduling induction.

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