Plywood Calculator

What Is a Plywood Calculator?

A plywood calculator estimates how many plywood sheets you need to cover a floor, wall, or roof surface. It accounts for sheet dimensions, total coverage area, and a waste factor for cuts and scraps. You also get an estimated material cost. For other flooring projects, see our Flooring Calculator.

How to Calculate Plywood Sheets Needed

First, calculate the surface area to cover. Add a waste allowance (typically 10%) for cutting losses. Then divide by the area of one plywood sheet and round up:

$$ \text{sheets} = \left\lceil \frac{\text{surface area} \times (1 + \text{waste\%})}{\text{sheet area}} \right\rceil $$

A standard 4 ft × 8 ft plywood sheet covers 32 square feet. For a 15 ft × 17 ft floor with 10% waste, you need about 9 sheets.

Tips for Buying Plywood

• Always add 10% to 15% waste for walls with windows and doors
• Standard sheet size in the US is 4 ft × 8 ft (32 sq ft)
• Compare price per sheet vs price per square foot to find the better deal
• Buy one extra sheet for future repairs when possible