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Roof Area Calculator
conversions
inchesfeet
1.08
2.17
3.25
4.33
5.42
6.50
7.58
8.67
9.75
10.83
11.92
Roof Area Calculators:
For each of the roof types pictured below, L = Horizontal Length, W = Horizontal Width, and H = Vertical Height, all entered in feet. Slope in inches per foot may substituted for H.

Hip roofs can present a problem for height measurement, and the slope method may be substituted in place of height measurement. Since modern architecture has allowed the incidence of mixed slopes in a single structure, the calculator allows for entry of differing slopes for intersecting roofs.

For many roofs, dimensions can be taken from the ground or from a ladder. Be sure that your measurements include any overhang at the eaves. Height can often be measured at the end wall at the center of a gable.

Complex roofs may have numerous repeats of these shapes - perform a separate calculation for each section, then add the results together (on paper) to obtain total roof area. A "salt box" roof with unequal sides may be calculated as two separate shed roof shapes. An "A-Frame" roof is simply a gable with high slope.

GABLE OR HIP ROOF: A gable roof and a hip roof of the same length and slope will have identical areas.  
Enter roof dimensions below for your roof in feet, (or slope as inches rise per foot.)
  • If you enter only L-1, W-1, & H-1, the result will be the area of a single straight gable roof.
  • If you enter all six values, the result will be the actual exposed area of both roofs. You cannot enter values for Area 2 alone.
  • The values calculated for roof 1 and roof 2 are independent. The total will not equal their added values, as the calculator subtracts the hidden area from roof 1 at the intersection, and displays only the actual exposed roof area for the total.
L-1W-1H-1 slope1
or /12
Area 1
= ft2
Total Exposed,
Areas 1 & 2
Combined:
ft2
Roof 1 Hidden Area
ft2
Roof 2 Ridge Length
ft
L-2W-2 H-2 slope2
or /12
Area 2
= ft2
 

Shed Roof:
Gather the dimensions for your shed roof, and enter below in feet, (or slope as inches rise per foot.)
L-5
W-5
H-5
 
or
Slope
 
/12
Area
= ft2

Additional Links:
How to Measure a Roof Roof Measurement Worksheet
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