Spike's Calculators


Roof Sheathing Hip Roof Metric Calculator

Estimate the number of sheets of plywood or OSB it takes for sheathing a Hip roof.
The calculation is based on sheets 1200 x 2400 millimetres. One sheet = 2.88 square metres.

Hip Roof Sheathing Calculator

Hip Roof Sheathing - Metric

Building Length m
Building Width m
Eave Overhang mm
Roof Pitch in Decimal Degrees °
Waste Percentage %


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


  1. enter the length of the building metres
  2. the width in feet and metres
  3. eaves overhang in millimetres
  4. the slope of the roof in degrees
  5. waste factor in a percentage preset @ 10%

The Results

  1. area of roof in square metres
  2. number of sheets needed based on exact area in square metres 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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