Estimate house wrap square footage and roll count from wall perimeter, height, openings, roll coverage and overlap allowance for siding preparation.
Enter your measurements and material details.
Gables and wall sections above porches may need to be added separately if an average rectangular wall height does not capture them.
House wrap is installed as a weather-resistive layer over exterior wall sheathing and is usually purchased by roll coverage. The geometry begins with exterior wall area, but overlaps, corners and detailing require more material than the net square footage alone.
Measure the exterior wall perimeter and average covered height. Subtract major door and window openings if desired, but keep enough allowance for wrapping corners and detailing openings. Add gables separately when they represent a meaningful amount of area.
Divide the adjusted wall area by the effective coverage of one roll and round up.
Large openings can be subtracted, while overlap and detailing should still be included in the allowance.
Follow the house-wrap manufacturer instructions; the calculator combines overlap and general waste into one editable percentage.
Only if their area is represented in the dimensions you enter; otherwise add them separately.
For quantity planning, yes if the product is measured by square-foot roll coverage and you use its specific overlap requirements.
Using the example inputs shown in the calculator — Exterior wall perimeter (ft) = 160, Average wall height (ft) = 9, Doors/windows area (sq ft) = 220, Coverage per roll (sq ft) = 900, Overlap/waste allowance (%) = 12 — the result is 2 rolls. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Net wall area: 1,220 sq ft; Area with overlap: 1,366 sq ft. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this house wrap calculator, the inputs with the greatest practical effect are exterior wall perimeter, average wall height and doors/windows area. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
These quick examples use the same calculator formula and the assumptions stated in each row. They are useful for scale checks; use your own measurements for ordering.
| Example | Calculated result |
|---|---|
| 120 ft perimeter × 8 ft walls | 2 rolls |
| 160 ft perimeter × 9 ft walls | 2 rolls |
| 200 ft perimeter × 9 ft walls | 2 rolls |
A useful house wrap estimate begins with dimensions taken from the actual project. Small measurement errors can become significant when they are repeated across many boards, joints, courses, bags or rolls. Record the dimensions you used and keep net geometry separate from the purchase allowance so the result can be checked later.
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