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Bolton Analysis Calculator

Work out bolton analysis instantly with clear inputs, formula shown and shareable results.

About Bolton Analysis Calculator

Divides the mandibular anterior six tooth widths by the maxillary six and compares the ratio with Bolton's 77.2 percent norm.

Formula

Bolton anterior ratio

Anterior ratio (%) = mandibular anterior 6 sum / maxillary anterior 6 sum x 100; the norm is 77.2%, with an overall 12-tooth norm of 91.3%

Worked example

With the default values below, Bolton Analysis Calculator returns Bolton anterior ratio of 77.36%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Mandibular anterior six width sumaccepts 20–60 mm
41 mm
Maxillary anterior six width sumaccepts 25–70 mm
53 mm

Results

Bolton anterior ratio
77.36%
Deviation from the 77.2% norm
0.16
Tooth material excess
0.08 mm
Where the excess lies
Mandibular excess

Step by step

  1. 1Values used
  2. 2Bolton anterior ratio
  3. 3Bolton anterior ratio= 77.36
  4. 4Deviation from the 77.2% norm= 0.16
  5. 5Tooth material excess= 0.08 mm
  6. 6Where the excess lies= Mandibular excess

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

What does an excess mean clinically?

It predicts that ideal overbite and overjet cannot be achieved without stripping, build-up or extraction.

Is the anterior or overall ratio more useful?

The anterior ratio is used more often because anterior discrepancies dominate aesthetic outcomes.

Related Calculators

Bolton Analysis Calculator – Calculate Bolton anterior ratio