Siding Calculator
One square is 100 sq ft of wall area to receive siding. Openings are ideally subtracted before entry.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Enter net wall area. Add waste for lap cuts and color batch safety.
What the math is doing
Squares = (sq ft × (1+waste)) ÷ 100.
Frequently asked questions
Corners and J-channel?
Add accessories by count and linear feet.
Insulated vinyl?
Squares still follow wall area; thickness changes details.
Fiber cement?
Pieces per square differ by exposure reveal.
Flashing?
Not included in squares math.