Rigid Foam Board Calculator
Calculate number of insulation boards needed based on area and board dimensions.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Provide total area and board size to estimate board count.
What the math is doing
Sheets = area ÷ 32 sq ft per sheet × (1+waste), rounded up.
Frequently asked questions
Taped seams?
Add tape linear feet separately.
Multiple layers?
Multiply sheet count by layers.
Termite shields?
Follow local code for exposed foam on foundations.
Thickness codes?
Verify required R-value for your zone.