Siding Calculator for Wall and Gable

Siding Exposure Lap

A simple siding calculator that will calculate the amount of boards needed to cover a wall and if needed, the gable. It can be used for any type of siding that comes in boards of one length.


Siding length, siding width and exposure need to be entered in inches and in decimal format.


Ex: Most commonly used board. 12' x 8 1/4" with an exposure of 7"

Values that need to be entered for this size board would be
Siding Length: 144" 
Siding Width:  8.25
Exposure:  7

For wall length enter the total length of your wall in decimal format feet.
For roof pitch enter the number your roof rises in 12"
Fraction To Decimal Conversion Chart
1/8     0.125 
1/4     0.25
3/8     0.375
1/2     0.5
5/8     0.625
3/4     0.75
7/8     0.875

The amount given of total siding needed does not include a waste factor.


These amounts must be filled in:

Siding Length inch
Siding Width inch
Exposure inch

Use these buttons to add walls or gables to your form:



The total results will appear here:

Total Siding:
Total Wall Area:



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