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Calcimator

Metal Roofing Calculator

Calculate the number of metal roofing panels, ridge cap, and total square footage needed for your roof.

Inputs

ft
ft
in
:12
%

Results

Panels Needed

13

Ridge Cap40 ft
Actual Roof Area1,265 sq ft
Metal Sq Ft1,644 sq ft
How to Use This Calculator
  1. Enter roof footprint dimensions (length and width in feet) and set roof pitch.
  2. Enter panel width and target waste factor percentage.
  3. Review calculated roof area, panel count, ridge cap length, and total materials needed.
  4. Order panels in standard lengths to minimize cuts -- work with your supplier on optimal order quantities.

How the result changes with Roof Width

Roof WidthPanels Needed
2510
7329
13251
18170

What each input means

Roof Length
Length of the roof slope from eave to ridge
Roof Width
Width of the roof along the eave
Panel Width
Width of each metal panel in inches
Roof Pitch
Roof pitch as rise per 12 inches of run
Waste Factor
Extra material for cuts and waste (typically 10-15%)

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Roof Length = 40, Roof Width = 30, Panel Width = 36, Roof Pitch = 4 = 5 input(s) provided
  2. Calculate Panels Needed
    Panels Needed
    13 = 13
  3. Calculate Ridge Cap
    Ridge Cap
    40 = 40
  4. Calculate Actual Roof Area
    Actual Roof Area
    1265 = 1265

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

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