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Localized Wood Subfloor Patch Quantity Calculator

Estimate patch compound for a group of similarly sized localized rectangular defects; enter each patch dimension and count.

Inputs

Project inputs

Range: 1–1,000

Range: 0.25–240 in

Range: 0.25–240 in

Range: 0.01–12 in

Measure the cavity, not the board thickness. This rectangular-prism estimate excludes irregular sidewalls and material pushed into joints.

Range: 0.001–10 ft3

Use product-specific yield for the selected patch compound. Example only: ARDEX Feather Finish lists 16.7 ft2 per 10 lb bag at 1/4 in, equivalent to about 0.348 ft3 by geometry; coverage varies with surface profile.

Range: 0–40 %

Optional estimating allowance for irregular cavities and jobsite loss; not an industry requirement.

Result

Area per patch
1.000 ft2
Bags to buy
1
Calculated fill volume
0.2083 ft3
Fill volume with allowance
0.2083 ft3
Nominal volume purchased
0.3480 ft3
Nominal surplus
0.1397 ft3
Total patch area
5.000 ft2

How this is calculated

Area per patch
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