Spike's Calculators

Roof Framing

Shed Roof Sheathing Calculator

Estimate the amount of plywood or OSB needed for sheathing a Shed roof. Calculation based on 4' x 8' sheets, 32 square feet per sheet.

Shed Roof Sheathing Calculator

Shed Roof Sheathing

Building Length A ft inch
Building Length B ft inch
Side Overhang inch
Front Overhang inch
Rear Overhang inch
Roof Pitch /12
Waste Percentage %


Roof Area ft²
Estimated Plywood Needed #
Waste Factor adds #
Plywood Needed Including Waste #


  1. enter the length A of the building in feet+inches
  2. the length B of the building in feet+inches
  3. side overhang in inches
  4. front overhang in inches
  5. rear overhang in inches
  6. roof pitch
  7. waste factor

The Results

  1. roof area in square feet
  2. number of sheets needed based on exact square footage of the roof
  3. the number of sheets the waste percentage will add
  4. Number of sheets needed including the waste
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