Bishop's Score Calculator
Bishop Score Calculator works out Bishop score and Maximum possible from Cervical dilation, Cervical effacement and Fetal station. The default figures on this page give bishop score of 5; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
7 steps
- Cervical dilation: 1-2 cm = 1 point(s).
- Cervical effacement: 40-50% = 1 point(s).
- Fetal station: -2 = 1 point(s).
- Cervical consistency: Medium = 1 point(s).
- Cervical position: Mid-position = 1 point(s).
- Classical Bishop total = 5 of a possible 13.
- Unfavourable: at 6 or less the cervix is usually described as unripe, and cervical ripening is commonly used before induction.
Componentstable
| component | grade | points | maximum |
|---|---|---|---|
| Cervical dilation | 1-2 cm (1 point) | 1 | 3 |
| Cervical effacement | 40-50% (1 point) | 1 | 3 |
| Fetal station | -2 (1 point) | 1 | 3 |
| Cervical consistency | Medium (1 point) | 1 | 2 |
| Cervical position | Mid-position (1 point) | 1 | 2 |
Modifierstable
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
3 sources
What the Bishop Score Calculator calculates
Scores cervical favourability for induction of labour from dilation, effacement, station, consistency and position, gives the 0-13 classical Bishop total with its interpretation, and separately applies the modified-Bishop adjustments for pre-eclampsia, parity, postdates and PPROM.
How to use this Bishop Score Calculator
Enter Cervical dilation, Cervical effacement, Fetal station and Cervical consistency. Bishop score updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Bishop score, Maximum possible and Modified Bishop score.
The method follows Bishop EH. Pelvic scoring for elective induction, ACOG Practice Bulletin No. 107: Induction of Labor and NICE guideline NG207: Inducing labour.
A middling cervix: 1 point on each of the five items example
With Cervical dilation: 1, Cervical effacement: 1, Fetal station: 1, Cervical consistency: 1, the calculator returns Bishop score: 5, Maximum possible: 13, Favourable cervix: No. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Bishop score, Maximum possible and Modified Bishop score. The inputs you can vary are Cervical dilation, Cervical effacement, Fetal station, Cervical consistency, Cervical position and Pre-eclampsia (+1).
Understanding Bishop score, Maximum possible and Modified Bishop score
A structured record of one vaginal examination, not a prediction for an individual. Bishop derived the score to predict spontaneous labour in multiparous women at term, and inter-examiner agreement on consistency and position is only moderate. Decisions about induction belong to the obstetric team.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How do you calculate Bishop score?
Scores cervical favourability for induction of labour from dilation, effacement, station, consistency and position, gives the 0-13 classical Bishop total with its interpretation. Open “How this is worked out” beside the result to see each step for your own figures.
What is a good Bishop score for induction?
Scores cervical favourability for induction of labour from dilation, effacement, station, consistency and position, gives the 0-13 classical Bishop total with its interpretation. On this page it is computed from Cervical dilation, Cervical effacement and Fetal station and shown as Bishop score, Maximum possible and Modified Bishop score.
What is a Bishop score of 5?
It needs Cervical dilation, Cervical effacement, Fetal station, Cervical consistency, Cervical position and Pre-eclampsia (+1). Nothing else is required, and the figures stay in your browser.
How long does it typically take to go into labor after a Bishop score of 3?
On the figures this page opens with, the bishop score is 5. No single number fits everyone: it follows Cervical dilation, Cervical effacement and Fetal station, so enter your own above and the answer updates as you type.
What information do I need for the Bishop Score Calculator?
You need Cervical dilation, Cervical effacement, Fetal station, Cervical consistency, Cervical position, Pre-eclampsia (+1), Previous vaginal deliveries (+1 each) and Postdates pregnancy (-1). The page opens with default figures that give bishop score of 5, so you can see the scale before entering your own.
What does this Bishop Score Calculator show?
It shows Bishop score, Maximum possible, Modified Bishop score, Net modifier, Interpretation, Favourable cervix, Components and Modifiers, with the working and any warnings for your entries.