Tooth Size Proportion Calculator

Work out tooth size proportion instantly with clear inputs, formula shown and shareable results.

About Tooth Size Proportion Calculator

Divides crown width by crown length and compares the result with the 0.78 ratio widely used as the aesthetic target for maxillary central incisors.

Formula

Width to length ratio

Ratio = crown width / crown length; the commonly cited aesthetic target is 0.75 to 0.80, with 0.72 to 0.85 accepted

Worked example

With the default values below, Tooth Size Proportion Calculator returns Width to length ratio of 0.810. Change any input above and every figure here is recalculated in your browser.

Inputs used

Crown widthaccepts 4–14 mm: 8.5 mm
Crown lengthaccepts 5–16 mm: 10.5 mm

Results

Width to length ratio: 0.810
Width matching a 0.78 ratio: 8.19 mm
Deviation from 0.78: 0.030
Aesthetic assessment: Within the accepted 0.72 to 0.85 range

Step by step

1Values used
2Width to length ratio
3Width to length ratio= 0.810
4Width matching a 0.78 ratio= 8.19 mm
5Deviation from 0.78= 0.030
6Aesthetic assessment= Within the accepted 0.72 to 0.85 range

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 3 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

Where does the golden proportion fit?

It describes the apparent widths of successive anterior teeth from the front, not the width to length ratio of one tooth.

Can the ratio be corrected?

Yes, by incisal lengthening, gingival recontouring or restorative widening depending on which dimension is at fault.