How many sheathing panels do I need?
Calculate the net wall area after opening deductions, add waste, divide by the coverage of one panel, and round up to a whole panel.
Exterior wall material planning
Wall Sheathing Calculator
Estimate net wall area, OSB or plywood panels, opening deductions, waste, fasteners, housewrap, seam tape, purchased coverage, and material cost.
Wall coverage
Area − openings
Material order
Panels + accessories
Project planning
Cost + overage
Inputs
Wall sheathing project details
Calculate net wall area, whole sheathing panels, fasteners, housewrap, seam tape, waste, and estimated material cost.
Wall area
Door and window deductions
Panels and waste
Fasteners and weather barrier
Supplier pricing
Structural and installation guidance
This is a quantity estimate, not a structural design. Verify panel type, thickness, grade, orientation, expansion gaps, edge blocking, fastening schedule, shear-wall requirements, weather-resistive barrier details and local code with approved plans and manufacturer instructions.
Results
Wall sheathing material estimate
Estimated material total
$606.00
Panels to purchase
10 panels
Net sheathing area
275.99 sq ft
Fastener boxes
1 box
Housewrap rolls
1 roll
Cost per net sq ft
$2.20
Area and purchase allowance
Gross wall area320 sq ft
Door area20.01 sq ft
Window area24 sq ft
Total opening deduction44.01 sq ft
Net sheathing area275.99 sq ft
Area with 10% waste303.59 sq ft
Panel coverage32 sq ft
Panels to purchase10
Purchased coverage320 sq ft
Whole-panel overage44.01 sq ft
Accessories
Estimated fasteners500
Fastener boxes1
Housewrap planning area303.59 sq ft
Housewrap rolls1
Estimated taped seams240 lin ft
Tape rolls2
Material cost
Sheathing panels$350.00
Fasteners$45.00
Housewrap$175.00
Seam tape$36.00
Material subtotal$606.00
Estimated tax (0%)$0.00
Delivery and additional fees$0.00
Estimated material total$606.00
How to use the wall sheathing calculator
Enter wall dimensions or a known net sheathing area. For dimension mode, add matching walls and deduct door and window openings. Then enter the exact panel coverage, waste, fastening, weather-barrier and supplier assumptions for the planned assembly.
Step 1
Measure wall area
Enter wall dimensions and quantities, then account for openings.
Step 2
Set product coverage
Use the purchased panel, fastener, wrap and tape specifications.
Step 3
Verify the assembly
Check plans, code, fastening schedules and manufacturer instructions.
Wall sheathing formulas
Gross wall area
Length × height × wall quantity
Net sheathing area
Gross wall area − door and window area
Panels to purchase
Net area × waste factor ÷ panel coverage
Whole-panel overage
Purchased panel coverage − net wall area
Wall sheathing planning FAQs
Should door and window openings be deducted?
Large openings can be deducted for planning. Some contractors keep small openings in the area because surrounding cuts and offcuts may consume similar material.
What wall sheathing thickness should I use?
Required material, thickness, grade, span rating and fastening depend on approved plans, framing spacing, wind and seismic design, shear walls, cladding and local code.
How much waste should be added?
A 10% allowance is a common planning starting point, but complex layouts, many openings, angled cuts, damage and limited reuse of offcuts can require more.
Does housewrap replace sheathing?
No. Structural sheathing and weather-resistive barriers perform different functions. Follow the approved wall assembly and manufacturer installation instructions.