Spray Foam Calculator
Compute spray foam requirements using board-foot style planning assumptions.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Enter area and foam thickness to estimate required foam quantity.
What the math is doing
Board feet = sq ft × (thickness in inches ÷ 12). Kits ≈ BF ÷ 600.
Frequently asked questions
Closed vs open cell?
Yields differ; adjust kit divisor with label data.
Substrate temperature?
Foam kits have minimum surface temperatures.
Masking?
Overspray waste increases; raise waste percentage.
Pro install?
Use contractor quotes instead of DIY kits for large jobs.