Spray Foam Calculator

Board Foot Calculator for Spray Foam

Calculate spray foam insulation coverage. One board foot equals 1 square foot at 1 inch thick.

Spray Foam Calculator

Calculate coverage for spray foam insulation kits

Foam Type

Length (feet)

Width/Height (feet)

Thickness (inches)

Waste Factor (%)

Note: Spray foam expands 30-100× its liquid volume. One board foot of cured foam covers 1 sq ft at 1" thick.

Closed Cell Foam

R-6 to R-7 per inch. Vapor barrier, structural strength. Best for exterior walls, roofs, and moisture-prone areas. More expensive.

Open Cell Foam

R-3.5 to R-4 per inch. Sound dampening, lower cost. Good for interior walls, attics (with vapor retarder), and soundproofing.

DIY Kits

Common sizes: 200 BF, 600 BF. At 2" thick, a 600 BF kit covers ~300 sq ft. Add 15-20% for waste and learning curve.

Vanliga frågor

How do I calculate spray foam board feet?

Board feet = Square feet × Thickness (inches). For a 100 sq ft wall at 2" thick: 100 × 2 = 200 board feet required.

What R-value do I need?

Depends on climate zone. Typical: R-13 to R-23 for walls (2-3" closed cell), R-38 to R-60 for attics (6-10" open cell).

How much waste should I plan for?

15-20% for experienced users, 25-30% for DIY beginners. More waste in complex areas with many corners and penetrations.

Specialized Calculators

Choose from our collection of specialized board foot calculators tailored for specific materials and applications

Need Additional Tools?

Explore our complete collection of SEO tools, AI software solutions, business applications, determinant math solvers, and engineering converters.

Board Feet Calculator for Insulation

Calculate board feet for insulation materials

Board Foot Calculator for Trees

Estimate board feet from standing trees

Board Feet Calculator for Standing Trees

Calculate timber volume for multiple trees

Board Foot Calculator for Wood

General wood board foot calculator

Board Foot Calculator for Plywood

Calculate board feet for plywood sheets

Board Foot Calculator for Logs

Estimate board feet from logs

Board Foot Calculator for Lumber

Standard lumber board foot calculator