Quick answer
One roofing square represents 100 square feet of roof surface. Divide the estimated surface area by 100, then plan waste and product-specific bundle coverage separately.
Step by step
- Estimate roof surface area. Use measured roof planes or a suitable plan-based method.
- Divide by 100. This gives the raw number of squares.
- Add layout allowance. Account for cuts, valleys, hips and starter material.
- Check package coverage. Bundle counts vary by product and exposure.
Formula or rule of thumb
Example
A 2,400 ft² roof surface equals 24 squares before waste and accessory calculations.
Common mistakes
Do not assume one shingle bundle always covers one-third of a square; package coverage varies by product.
Planning note: product yields, installation methods, site conditions and local requirements can change the final quantity. Use the exact manufacturer or supplier information before purchasing.
FAQ
Are accessories included in squares?
No. Starter, ridge, valley, underlayment and flashing need separate planning.
Should I measure complex roofs myself?
Use safe measurements or professional roof measurement for complex or inaccessible roofs.
Does waste change square count?
The raw squares remain geometric; waste changes the purchase quantity.