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Calcimator

Treatment Duration Estimator Calculator

Estimate orthodontic treatment length based on malocclusion severity, appliance type, patient age, and compliance.

Inputs

mm
years
%

Results

Estimated Duration (months)

20.5

Optimistic Estimate (months)17.4
Conservative Estimate (months)24.6
Total Weeks89
Estimated Visits25
Age Factor0.9
Compliance Factor1
Appliance NameMetal Brackets
How to Use This Calculator
  1. Enter malocclusion complexity score, patient age (years), and compliance level.
  2. Enter starting Peer Assessment Rating (PAR) score if available.
  3. Read estimated treatment duration (months) based on complexity and patient factors.
  4. Review factors that extend treatment: severe crowding, skeletal discrepancy, poor compliance.
  5. Use the estimate to set realistic patient expectations at the start of treatment.

How the result changes with Expected Compliance

Expected ComplianceEstimated Duration (months)
1047.2
3536.9
6525.1
9020.5

What each input means

Angle Classification
0 = Class I, 1 = Class II, 2 = Class III malocclusion.
Crowding (mm)
Total arch crowding measured in millimeters.
Appliance Type
0 = Metal brackets, 1 = Ceramic brackets, 2 = Clear aligners, 3 = Lingual.
Patient Age
Patient age in years. Adolescents typically have faster treatment.
Expected Compliance
Estimated patient compliance with elastics, aligners, and appointments.
Extractions Planned
0 = No extractions, 1 = Extractions planned (adds space-closure time).
Impacted Teeth
0 = None, 1 = Impacted canine or other tooth requiring alignment.

What each result means

Estimated Duration (months)
Expected treatment duration in months.
Optimistic Estimate (months)
Best-case treatment duration (15% faster).
Conservative Estimate (months)
Worst-case treatment duration (20% longer).
Total Weeks
Duration converted to weeks.
Estimated Visits
Approximate number of adjustment appointments.
Age Factor
Multiplier based on patient age (lower = faster).
Compliance Factor
Multiplier based on expected compliance.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Angle Classification = 0, Crowding (mm) = 4, Appliance Type = 0, Patient Age = 14 = 7 input(s) provided
  2. Calculate Estimated Duration
    Estimated Duration
    20.5 = 20.5
  3. Calculate Optimistic Estimate
    Optimistic Estimate
    17.4 = 17.4
  4. Calculate Conservative Estimate
    Conservative Estimate
    24.6 = 24.6

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