Roof Sheathing Calculator
Use this tool to calculate the amount of roof sheathing you need for your project. Enter the roof dimensions, pitch, and optionally the sheathing size to get an accurate estimate.

Table of Contents
- 1. How do I calculate how much sheathing I need?
- 2. How to calculate roof sheeting?
- 3. What thickness of sheathing for a roof?
1. How do I calculate how much sheathing I need?
To calculate the amount of sheathing needed, measure the roof's length and width, then multiply them to get the total area. Divide the total area by the size of a single sheathing sheet (e.g., 32 square feet for a 4x8 ft sheet).
2. How to calculate roof sheeting?
Roof sheeting is calculated by determining the roof's total area, including adjustments for pitch. Use the formula: Total Area = Length × Width × Pitch Factor. The pitch factor depends on the roof's slope.
3. What thickness of sheathing for a roof?
The thickness of roof sheathing depends on the roof's load requirements. Common thicknesses are 1/2 inch or 5/8 inch for residential roofs. Consult local building codes for specific requirements.