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Calcimator

Stainless Steel Crown Sizing Calculator

Determine the correct SSC size from mesiodistal tooth width, tooth position, and preparation parameters.

Inputs

Results

Recommended crown size

5

Try size down4
Try size up6
Nominal crown height (mm)5
Estimated crimping needed (mm)0.4
Total proximal reduction (mm)1
Fit assessment1
How to Use This Calculator
  1. Select the Tooth position (1–6): upper/lower primary molars or first permanent molars.
  2. Measure and enter the Mesiodistal width in mm using calipers on the prepared tooth — measure at the widest contact point.
  3. Enter the Proximal reduction per side (mm) performed during preparation and the Occlusal reduction (mm) for crown seating.
  4. Review the Recommended crown size (2–7), plus the Try size down and Try size up options to have adjacent sizes ready at chairside.
  5. Note the Nominal crown height (mm), Estimated crimping needed (mm), Total proximal reduction (mm), and Fit assessment (0 = likely tight, 1 = good fit, 2 = likely loose) to guide final seating.

How the result changes with Mesiodistal width (mm)

Mesiodistal width (mm)Recommended crown size
52
7.56
117
137

What each input means

Tooth position
1=Upper 1st primary molar, 2=Upper 2nd primary molar, 3=Lower 1st primary molar, 4=Lower 2nd primary molar, 5=Upper 1st permanent molar, 6=Lower 1st permanent molar.
Mesiodistal width (mm)
Measured mesiodistal width of the prepared tooth in millimeters.
Proximal reduction per side (mm)
Amount of enamel/dentin reduced on each proximal surface.
Occlusal reduction (mm)
Amount of occlusal reduction for crown seating.

What each result means

Recommended crown size
Best-fit SSC size number (2–7).
Try size down
One size smaller for trial fitting.
Try size up
One size larger for trial fitting.
Nominal crown height (mm)
Typical crown height for this tooth position.
Estimated crimping needed (mm)
Approximate marginal crimping adjustment.
Total proximal reduction (mm)
Combined reduction from both proximal surfaces.
Fit assessment
0=Likely tight (size up), 1=Good fit, 2=Likely loose (size down).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Tooth position = 3, Mesiodistal width (mm) = 7, Proximal reduction per side (mm) = 0.5, Occlusal reduction (mm) = 1.5 = 4 input(s) provided
  2. Calculate Recommended crown size
    Recommended crown size = 2
    5 = 5
  3. Calculate Try size down
    Try size down = max(2, crownSize - 1)
    4 = 4
  4. Calculate Try size up
    Try size up = min(7, crownSize + 1)
    6 = 6

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