Rex says
Same equations the textbooks use — just way less awkward. Pop in your stats and I'll tell you what the number actually means for you.
Try a scenario
Click to load — tweak from there.Inputs
Result
Bishop score
5
Induction favorability
Unfavorable — cervical ripening agent typically recommended before oxytocin
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How to use this
- 1Enter cervical dilation.
- 2Enter effacement.
- 3Enter fetal station.
- 4Enter cervical consistency.
- 5Enter cervical position.
- 6Read your bishop score on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
The Bishop score assesses how favorable the cervix is for induction of labor, scoring cervical dilation, effacement, station of the presenting part, consistency, and position, each 0-3 points (station 0-3, position 0-2), for a total of 0-13. A score of 8 or higher suggests a favorable cervix with a likelihood of successful vaginal delivery after induction similar to spontaneous labor, while a score of 6 or below suggests an unfavorable cervix where cervical ripening agents (like prostaglandins or a mechanical dilator) are typically used before or alongside oxytocin to improve the chance of successful induction and reduce the risk of a failed induction leading to cesarean delivery. A modified Bishop score adjusting for parity, prior cesarean, gestational age, and preeclampsia is sometimes used for more individualized risk prediction, but the classic score remains the standard bedside tool for induction planning discussions. This tool is for education and workflow support only — not medical advice. Always verify results with a clinician and use clinical judgment alongside your institution's protocols.
Worked example
Using the values the calculator loads with:
Inputs
- Cervical dilation: 1-2 cm (1)
- Effacement: 40-50% (1)
- Fetal station: −2 (1)
- Cervical consistency: Medium (1)
- Cervical position: Mid-position (1)
Results
- Bishop score: 5
- Induction favorability: Unfavorable — cervical ripening agent typically recommended before oxytocin
What each field means
Inputs
- Cervical dilation
- Pick the option that matches your situation — the maths changes per option. Choices: Closed (0), 1-2 cm (1), 3-4 cm (2), ≥5 cm (3).
- Effacement
- Pick the option that matches your situation — the maths changes per option. Choices: 0-30% (0), 40-50% (1), 60-70% (2), ≥80% (3).
- Fetal station
- Pick the option that matches your situation — the maths changes per option. Choices: −3 (0), −2 (1), −1 / 0 (2), +1 / +2 (3).
- Cervical consistency
- Pick the option that matches your situation — the maths changes per option. Choices: Firm (0), Medium (1), Soft (2).
- Cervical position
- Pick the option that matches your situation — the maths changes per option. Choices: Posterior (0), Mid-position (1), Anterior (2).
Results
- Bishop score
- Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Induction favorability
- Returned as a plain value. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What Bishop score is considered favorable for induction?
A score of 8 or higher is generally considered favorable, associated with a likelihood of successful induction comparable to spontaneous labor. Scores of 6 or below are considered unfavorable and typically prompt use of a cervical ripening method before or alongside oxytocin to improve the odds of vaginal delivery.
What happens with an unfavorable Bishop score before induction?
Cervical ripening agents — prostaglandin preparations (like misoprostol or dinoprostone) or mechanical methods (like a Foley balloon catheter) — are commonly used first to soften and dilate the cervix, since starting oxytocin on a very unfavorable cervix increases the risk of a prolonged, failed induction and higher cesarean rates.
Does parity affect how the score should be interpreted?
Yes, informally — multiparous patients tend to have more favorable induction outcomes at a given Bishop score than nulliparous patients, since prior vaginal delivery affects cervical and pelvic factors not fully captured by the score. Some modified versions explicitly add points for multiparity, but the classic score does not.
Can Bishop score predict cesarean risk directly?
It correlates with induction success broadly, but it's a labor-planning tool, not a precise cesarean-risk calculator — many other factors (fetal size, maternal pelvis, indication for induction, gestational age) also influence whether an induction ultimately ends in cesarean delivery.
Accuracy and limitations
- Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.
- Results do not account for medical conditions, medication, or pregnancy.
- Use this as a directional reference, not a diagnosis — talk to a clinician before acting on it.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Bishop Score Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/bishop-score
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/bishop-score" target="_blank" rel="noopener">Bishop Score Calculator — RevenueLab</a> (2026).</p>
Source: [Bishop Score Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/bishop-score) (2026).