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Calcimator

SIP Panel Calculator

Structural insulated panel count, R-value, and cost from wall/roof dimensions and panel thickness.

Inputs

ft
ft
sq ft
sq ft
ft
ft
%

Results

Panels to order

37

Insulation R-value

22.4

Panels (net)33
Total panel area1,032 sq ft
Gross wall area1,152 sq ft
Net wall area1,032 sq ft
Panel thickness6.5 in
Estimated weight3,560 lbs
Estimated material cost$8,514.00
Area per panel32 sq ft
How to Use This Calculator
  1. Enter Building perimeter, Wall height, and Window/door openings.
  2. Set Roof SIP area, Panel width, and Panel height.
  3. Adjust Panel thickness, Waste allowance as needed.
  4. Review Panels to order and Insulation R-value.
  5. Use Panels (net) and Total panel area (sq ft) to inform your decision.

How the result changes with Building perimeter

Building perimeterPanels to orderInsulation R-value
1093022.4
35710722.4
65420022.4
90127522.4

What each input means

Building perimeter
Total perimeter of the building for wall panels (e.g., 32+32+32+32 = 128 ft for a 32×32 building).
Wall height
Floor-to-plate height for wall SIPs.
Window/door openings
Total area of windows and doors to subtract from wall panels.
Roof SIP area
Roof area covered by SIPs (set to 0 if using conventional rafters). Measure along the slope, not the horizontal footprint.
Panel width
Width of each SIP panel (commonly 4 ft).
Panel height
Height of each SIP panel (commonly 8, 9, 10, or 12 ft).
Panel thickness
0 = 4.5", 1 = 6.5", 2 = 8.25", 3 = 10.25", 4 = 12.25".
Waste allowance
Extra panels to order for cuts and fitting around openings.

What each result means

Panels to order
Total number of SIP panels including waste allowance.
Panels (net)
Minimum panels needed without waste.
Insulation R-value
Whole-panel R-value based on EPS core and OSB skins.
Total panel area
Net wall area plus roof SIP area.
Gross wall area
Perimeter × wall height before deducting openings.
Net wall area
Wall area after subtracting windows and doors.
Panel thickness
Selected SIP thickness.
Estimated weight
Approximate total weight of all SIP panels.
Estimated material cost
Rough material cost based on panel thickness and area.
Area per panel
Width × height of one panel.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Building perimeter = 128, Wall height = 9, Window/door openings = 120, Roof SIP area = 0 = 8 input(s) provided
  2. Calculate Panels to order
    Panels to order = ceil(panelsNet * (1 + wastePct / 100))
    37 = 37
  3. Calculate Insulation R-value
    Insulation R-value = coreThickness * 3.8 + 2 * 0.5
    22.4 = 22.4
  4. Calculate Panels
    Panels = ceil(totalArea / panelArea)
    33 = 33
  5. Calculate Total panel area
    Total panel area = netWallArea + roofAreaSqFt
    1032 = 1032

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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