The Bishop score was published in 1964 and is still the standard bedside assessment before induction. A score of 8 or more means the cervix is favourable and the chance of vaginal delivery after induction is similar to spontaneous labour; 6 or less suggests the cervix needs ripening first.
How to use the Bishop Score Calculator
- Dilation
- Effacement
- Fetal station
- Cervical consistency
- Cervical position
Results update as you type, and every field accepts the units shown in its menu.
How it works
Each answer carries the points shown in the published score. The calculator adds them up and maps the total to the published interpretation.
Scoring table
| Item | Answers and points |
|---|---|
| Dilation | Closed = 0; 1–2 cm = 1; 3–4 cm = 2; 5 cm or more = 3 |
| Effacement | 0–30% = 0; 40–50% = 1; 60–70% = 2; 80% or more = 3 |
| Fetal station | −3 = 0; −2 = 1; −1 or 0 = 2; +1 or +2 = 3 |
| Cervical consistency | Firm = 0; Medium = 1; Soft = 2 |
| Cervical position | Posterior = 0; Mid-position = 1; Anterior = 2 |
Inputs explained
| Field | What to enter |
|---|---|
| Dilation | Choose one: Closed, 1–2 cm, 3–4 cm, 5 cm or more |
| Effacement | Choose one: 0–30%, 40–50%, 60–70%, 80% or more |
| Fetal station | Choose one: −3, −2, −1 or 0, +1 or +2 |
| Cervical consistency | Choose one: Firm, Medium, Soft |
| Cervical position | Choose one: Posterior, Mid-position, Anterior |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
Score = sum of the points for each item
Worked example
Inputs — Dilation: 1–2 cm; Effacement: 40–50%; Fetal station: −2; Cervical consistency: Medium; Cervical position: Mid-position.
Results — Bishop score = 5 / 13; Interpretation = Unfavourable cervix – ripening likely needed.
Key terms
- Effacement
- Thinning of the cervix.
- Station
- How far the baby's head has descended in the pelvis.
Frequently asked questions
What is a good Bishop score for induction?
8 or more.
What happens with a low score?
Cervical ripening with prostaglandins or a balloon catheter is usually used first.
Does a high score mean labour will start soon?
It suggests the cervix is ready, but it cannot predict exactly when labour will begin.