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Dental Caries Index (DMFT) Calculator

Work out dental caries index (dmft) instantly with clear inputs, formula shown and shareable results.

About Dental Caries Index (DMFT) Calculator

Adds decayed, missing and filled teeth to give the DMFT index, and reports the restorative index showing what share of affected teeth have been treated.

Formula

DMFT

DMFT = decayed + missing + filled teeth; restorative index = filled / (decayed + filled) x 100. WHO bands: very low <1.2, low 1.2-2.6, moderate 2.7-4.4, high 4.5-6.5, very high >6.5

Worked example

With the default values below, Dental Caries Index (DMFT) Calculator returns DMFT index of 8. Change any input above and every figure here is recalculated in your browser.

Inputs used

Decayed teethaccepts 0–32
3
Missing teeth due to cariesaccepts 0–32
1
Filled teethaccepts 0–32
4

Results

DMFT index
8
WHO severity band
Very high (WHO)
Restorative index
57.1%
Share of 32 teeth affected
25.0%

Step by step

  1. 1Values used
  2. 2DMFT
  3. 3DMFT index= 8
  4. 4WHO severity band= Very high (WHO)
  5. 5Restorative index= 57.1
  6. 6Share of 32 teeth affected= 25.0

Assumptions and limits

  • The result is derived only from the 3 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 1 decimal place, 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

Is DMFT counted per tooth or surface?

DMFT counts teeth; DMFS counts surfaces and is more sensitive to small changes.

Which teeth are excluded?

Teeth missing for reasons other than caries, such as orthodontic extraction or trauma, are not counted.

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