Bishop Score Calculator
HealthCalculate the Bishop Score to assess cervical readiness for labor induction from dilation, effacement, station, consistency, and position. Educational use only.
Reviewed by the thecalcu.com team · Last updated July 10, 2026
Bishop Score
Induction Favorability
—
Not a substitute for clinical judgment. This is a general educational estimate only. Every decision about inducing labor, cervical ripening agents, or mode of delivery must be made together with your obstetrician, based on a real physical exam and your full clinical picture.
What is a Bishop Score?
A Bishop Score Calculator totals the five components of the Bishop Score, cervical dilation, effacement, station, consistency, and position, into a single score from 0 to 13 that reflects how ready the cervix is for labor induction. Originally published by Dr. Edward Bishop in 1964, this scoring system remains one of the most widely used tools in obstetrics for guiding induction decisions.
This is educational information only, not medical advice, and it is not a substitute for your obstetrician's clinical judgment. The Bishop Score depends entirely on an accurate physical cervical exam performed by a trained provider, this calculator simply adds up the numbers once those exam findings are known. Every decision about whether, when, and how to induce labor must be made by your care team based on your complete clinical picture, including your medical history, the reason induction is being considered, and real-time fetal monitoring, never from a score alone.
Generally, a total score of 8 or higher is considered favorable, correlating with induction success rates similar to spontaneous labor. A score below 6 is generally considered unfavorable, and providers often consider cervical ripening methods first to improve the odds of a successful vaginal delivery.
Why Use a Bishop Score Calculator?
When a labor induction is being considered, whether for a medical indication, post-term pregnancy, or another reason your provider has discussed with you, the Bishop Score gives a standardized way to communicate cervical readiness across the obstetric team. Manually adding five separate point values under time pressure during labor and delivery is an easy place to make an arithmetic slip; this calculator removes that risk.
It's also a useful educational tool for expectant parents who want to understand the terminology their provider uses, dilation, effacement, station, consistency, position, and how those individual findings combine into the single number that often comes up in conversations about induction timing.
Who Should Use This Calculator?
Labor and delivery nurses, midwives, and obstetric residents who want a fast, accurate way to total a Bishop Score during a busy shift, freeing up time for patient care rather than manual arithmetic.
Expectant parents preparing for a discussed induction who want to understand what their provider means when they mention a Bishop Score, and what "favorable" or "unfavorable" implies about the plan going forward.
Students and trainees in obstetrics and midwifery learning the five components of the Bishop Score and how they combine, using the calculator as a study aid alongside textbook definitions.
Anyone researching post-term pregnancy management who wants to understand the objective criteria providers use when discussing induction versus continued expectant management, always in conjunction with, never instead of, their own provider's explanation.
What Insights Does the Bishop Score Calculator Give You?
Bishop Score (the primary output) is the sum of all five component scores, out of a maximum of 13 points. This is the number most commonly referenced in clinical discussions about induction readiness.
Induction Favorability translates the raw score into one of three plain-language categories, favorable (score ≥ 8), intermediate (6-7), or unfavorable (below 6), each shown with a color-coded badge, giving quick context for what the number means in practice.
How to use this Bishop Score calculator
Select your Cervical Dilation value from the dropdown, based on your provider's exam findings in centimeters.
Select your Effacement percentage, how thinned the cervix has become.
Select your Fetal Station, how far the baby's head has descended relative to the ischial spines.
Select your Cervical Consistency, firm, medium, or soft.
Select your Cervical Position, posterior, mid-position, or anterior.
Read your total Bishop Score, the large number in the result card, and the associated favorability category beneath it.
Discuss your result with your obstetric provider, who will weigh it alongside your full medical history and the reason induction is being considered.
Track changes over multiple exams if cervical ripening is underway, re-running the calculator as new exam findings become available to follow your cervix's progress toward a more favorable score.
Show formula & methodology ↓Show less ↑
Formula & Methodology
Bishop Score Components | Factor | 0 pts | 1 pt | 2 pts | 3 pts | |---|---|---|---|---| | Dilation | Closed | 1-2 cm | 3-4 cm | ≥5 cm | | Effacement | 0-30% | 40-50% | 60-70% | ≥80% | | Station | -3 | -2 | -1 / 0 | +1 / +2 | | Consistency | Firm | Medium | Soft | N/A | | Position | Posterior | Mid-position | Anterior | N/A | Total ScoreBishop Score = Dilation + Effacement + Station + Consistency + Position (range: 0-13)InterpretationScore ≥ 8 → Favorable, high likelihood of successful induction Score 6-7 → Intermediate, induction may succeed, ripening sometimes considered Score < 6 → Unfavorable, cervical ripening agents often considered first--- Worked Example: An obstetric exam finds: dilation 3 cm, effacement 50%, station -1, consistency medium, position anterior. | Factor | Finding | Points | |---|---|---| | Dilation | 3 cm | 2 | | Effacement | 50% | 1 | | Station | -1 | 2 | | Consistency | Medium | 1 | | Position | Anterior | 2 | Total = 2 + 1 + 2 + 1 + 2 = 8 Score of 8 → Favorable, high likelihood of successful induction With a favorable score, this patient's care team may proceed with induction using standard protocols. Her provider may also reference her estimated due date using the EDD Calculator or Pregnancy Due Date Calculator when discussing the timing and indication for induction.
Frequently Asked Questions