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Modified Bishop Score Calculator

Enter each cervical component score to compute the modified Bishop score.

How it is calculated

This tool does not take centimetres or percentages. You enter the already-assigned points for each of five findings, and it adds them: score = dilation + effacement + station + consistency + position. The allowed points are 0 to 3 for dilation, effacement and station, and 0 to 2 for consistency and position, so the highest possible total is 13. All five fields are required and must be whole numbers; a missing field, a fraction or a value outside its range gives no result. The conversion of an exam finding into points (for example how many centimetres of dilation earn how many points) comes from the Bishop chart your unit uses; the tool does not do it for you. The total is then labelled: 5 or less is an unfavorable cervix for induction, 6 to 7 is "Intermediate", and 8 or more is a favorable cervix. It is an educational aid and not a clinical decision.

Worked example

Suppose the examiner has already scored the findings using the chart: dilation 2, effacement 1, station 2, consistency 1 (medium) and position 1. The tool adds 2 + 1 + 2 + 1 + 1 = 7 / 13. Seven falls in the 6 to 7 band, so the result is "Intermediate". If the station were scored 3 instead of 2 and dilation 3 instead of 2, the total would be 9 and the label would change to a favorable cervix. The tool also shows a reminder that the result is not medical advice.

Try this example →

Common mistakes

  • Entering the measurement instead of the points. Typing 4 for dilation in cm is rejected, because the field takes the 0 to 3 points, not centimetres.
  • Mixing up the scales. Consistency and position only go up to 2, while dilation, effacement and station go up to 3; a value of 3 in consistency gives no result.
  • Using the original Bishop chart for one component and a modified chart for another. Scoring tables differ between versions, so use one chart consistently.
  • Entering a half point, such as 1.5. Each component is a whole number of points, and a fraction gives no result, so round to the point value your chart assigns.
  • Treating the label as a prediction for one patient. A favorable score means induction is more likely to succeed on average, not that it will; the decision rests on the clinical picture.

Sources

About this calculator

The modified Bishop score is an obstetric scoring system used to assess how ready (“favorable”) the cervix is for labor induction, summing points across five components — cervical dilation, effacement, fetal station, cervical consistency, and cervical position — each scored on its own small scale, for a total that typically ranges from 0 to 13.

A higher total score indicates a more favorable cervix and generally correlates with a higher likelihood of successful induction leading to vaginal delivery, while a low score often means the cervix needs preparatory (“ripening”) treatment before induction is attempted. Obstetricians and labor-and-delivery clinicians use it as a standard part of the pre-induction assessment alongside other clinical factors. This calculator sums the five component scores you enter into the total modified Bishop score — it is not medical advice and does not replace clinical evaluation.

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