Space Analysis Calculator

Perform Bolton ratio analysis and arch length discrepancy measurement for orthodontic treatment planning.

Mandibular 12 Tooth Sum (mm)

Maxillary 12 Tooth Sum (mm)

Mandibular Anterior 6 Sum (mm)

Maxillary Anterior 6 Sum (mm)

Arch Perimeter Available (mm)

Total Tooth Width Sum (mm)

Tab to move between fields

Bolton Overall Ratio (%)

91.21%

Bolton Anterior Ratio (%)77.08%

Overall Deviation from Ideal (%)-0.09

Anterior Deviation from Ideal (%)-0.12

Overall Tooth Size Excess (mm)-0.1

Anterior Tooth Size Excess (mm)-0.1

Arch Length Discrepancy (mm)-5

Crowding ClassificationModerate Crowding

Overall SignificantNo

Anterior SignificantNo

How to Use This Calculator

Measure and enter tooth widths (mm) for each tooth in the arch using a Boley gauge or digital calipers.
Enter arch length (mm) measured along the dental arch from first molar to first molar.
Read arch length discrepancy (mm): negative = crowding, positive = spacing.
Use Bolton analysis outputs to identify tooth size discrepancies between maxillary and mandibular arches.
Incorporate space analysis into extraction decision-making alongside cephalometric and facial evaluation.

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