If your cervix is already “ready,” induction is more likely to work with fewer complications. The Bishop Score Calculator uses cervical position, effacement, dilation, consistency, and station to produce a score that helps guide induction decisions.
This guide explains what each Bishop Score component means, how the total score is calculated, and how to interpret typical ranges. Use the calculator to practice and to understand discussions with your healthcare team.
What Is the Bishop Score?
The Bishop Score is a clinical scoring system used to estimate how ready the cervix is for labor. It’s most commonly used before induction of labor to help clinicians estimate whether induction is likely to be successful.
The score is based on five cervical characteristics. Each feature receives points, and the total score helps estimate the likelihood that the cervix will respond to induction.
Core Concepts: The Five Components
Different medical sources can vary slightly in point cutoffs, but the standard Bishop Score evaluates the following:
- Dilation (cm): How open the cervix is.
- Effacement (%): How much the cervix has thinned/shortened.
- Station: How high the baby’s head is relative to the ischial spines.
- Consistency: Whether the cervix feels firm or softened.
- Position: Whether the cervix is posterior, mid-position, or anterior.
Each category maps to a points value. The total score is the sum of the points across all five categories.
Bishop Score Formula (How the Total Is Calculated)
The Bishop Score is not a single algebraic equation; it’s a points-based index. The “formula” is:
Total Bishop Score = Position points + Consistency points + Dilation points + Effacement points + Station points
Below are the points commonly used in the standard Bishop Score approach.
Dilation (points)
| Exam finding | Points |
|---|---|
| 0–1 cm | 0 |
| 2 cm | 1 |
| 3–4 cm | 2 |
| ≥ 5 cm | 3 |
Effacement (points)
| Exam finding | Points |
|---|---|
| < 30% | 0 |
| 30–50% | 1 |
| 50–70% | 2 |
| ≥ 80% | 3 |
Station (points)
| Station (relative to ischial spines) | Points |
|---|---|
| -3 | 0 |
| -2 | 1 |
| -1, 0 | 2 |
| +1 or +2 | 3 |
Consistency (points)
| Consistency | Points |
|---|---|
| Firm | 0 |
| Medium | 1 |
| Soft | 2 |
Position (points)
| Position | Points |
|---|---|
| Posterior | 0 |
| Mid-position | 1 |
| Anterior | 2 |
How to Interpret the Total Bishop Score
Clinicians often interpret the Bishop Score as a measure of cervical readiness. While cutoffs can vary by facility and patient context, a common framework is:
- 0–4: Cervix is generally not favorable.
- 5–6: Cervix is borderline.
- ≥ 7: Cervix is generally favorable.
Higher scores usually mean induction is more likely to be effective. Lower scores may prompt additional time, cervical ripening methods, or alternative planning.
Practical Examples: Using the Bishop Score Calculator
Example 1: Favorable cervix before induction
Imagine an exam shows dilation 3 cm, effacement 80%, station 0, soft consistency, and anterior position. Those features typically align with more points, producing a higher total score.
In real clinical practice, a favorable score often supports moving forward with induction, sometimes with less need for prolonged ripening.
Example 2: Unfavorable cervix—what the score suggests
Now consider dilation 1 cm, effacement 40%, station -2, firm consistency, and posterior position. This pattern usually yields a low total Bishop Score.
A low score commonly signals that the cervix may need ripening first, and clinicians may adjust the plan accordingly.
Important Notes and Safety
The Bishop Score is a useful tool, but it is not a guarantee. It does not predict labor with certainty because outcomes depend on many factors, including fetal position, maternal health, and how the body responds to induction.
Always treat the calculator as educational. Your healthcare team will consider your full medical picture and local protocols.
Frequently Asked Questions
What does a Bishop Score of 6 mean?
A Bishop Score of 6 usually falls into a borderline or intermediate range. It suggests the cervix may be starting to become favorable, but it may not be fully ready. Clinicians may consider cervical ripening, timing, and patient-specific factors before induction.
How is cervical effacement measured for the Bishop Score?
Cervical effacement is typically estimated during a vaginal exam as the percentage of thinning from the cervix’s original length. For scoring, examiners map the estimate into ranges such as less than 30%, 30–50%, 50–70%, or 80% and above.
Can the Bishop Score change over time?
Yes. The cervix can change as labor approaches and with interventions. A repeat exam may show increased dilation, higher station, more effacement, or softer, more anterior cervical tissue. Because the Bishop Score is based on a moment-in-time exam, it can shift.
Is the Bishop Score the same in every hospital?
Most hospitals use a similar point structure, but small differences in cutoffs and station definitions can exist. Your clinician may use local guidelines. That’s why you should interpret your score in context rather than comparing it to a single universal rule.
Does a higher Bishop Score always mean faster labor?
A higher score generally indicates a more favorable cervix, which often correlates with a higher chance of successful induction. However, it does not guarantee faster labor. Labor progress also depends on contractions, fetal position, uterine activity, and individual anatomy.
How to Use This Bishop Score Calculator
Enter the five cervical findings from your exam. The calculator converts inputs into the points system and totals the score. Use the result to understand the “favorable vs not favorable” concept discussed by your clinician.
If any input is missing or outside expected ranges, the calculator will prompt you to correct it so the total remains accurate.