Spike's Calculators


Mansard Roof Square Footage Calculator

Spike VM

Calculate the square footage of Mansard style roof.

Mansard style roof

A Mansard roof is a four-sided Gambrel style Hip roof.

Mansard Roof Square Footage

Building Length ft inch
Building Width ft inch
Eaves Overhang inch
Upper Roof Pitch /12
Lower Roof Pitch /12
Lower Roof Length ft inch


Lower Roof Area ft²
Lower Roof Angle °
Lower Roof Slope %
Upper Roof Area ft²
Upper Roof Angle °
Upper Roof Slope %
Total Roof Area ft²
Ridges of Lower Roof lin.ft.
Quite often the upper part of the roof is basically a flat area.
In case the Upper roof is a Gable or Hip style roof the
additional ridge length for capping needed is provided below.
Additional Ridges for a
Gable Upper Roof
Additional Ridges for a
Hip Upper Roof


  1. Enter the length of the building. (feet+inches)
  2. Enter the width of the building. (feet+inches)
  3. Enter the overhang of the eaves. (inches)
  4. Enter the pitch of the upper roof: (rise /12")
  5. Enter the pitch of the lower roof: (rise /12")
  6. Enter the length of the lower roof. (feet+inches)


For the steep lower section of the roof the square feet, roof pitch in degrees and slope percentage
For the upper roof the square feet, roof pitch in degrees and slope percentage.
The length of the four hips/ridges of the lower roof section for capping in lineal feet

Mansard style roof
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