Planning result
For 1,800 sq ft of measured roof area with 15% waste, plan 2,070 sq ft, or 20.7 roofing squares. At 3 bundles per square, this rounds to 63 field-shingle bundles.
Assumptions
| Measured roof area | 1,800 sq ft after pitch and roof planes are included. |
|---|---|
| Waste | 15% for a more cut-up roof. |
| Bundle rate | 3 bundles per roofing square. |
| Accessories | Accessory materials are not included in field-shingle bundles. |
Calculation
| Step | Result | Formula |
|---|---|---|
| Measured roof area | 1,800 sq ft | Given roof surface area |
| Waste-adjusted area | 2,070 sq ft | 1,800 x 1.15 |
| Roofing squares | 20.7 squares | 2,070 / 100 |
| Bundles | 62.1 bundles | 20.7 x 3 |
| Practical buy | 63 bundles | Round up to full bundles |
Why waste is higher here
Hips, valleys, dormers, skylights, and short roof planes can increase cut waste. The percentage should reflect roof complexity.
Confirm product packaging
Some shingles do not use exactly 3 bundles per square. Always check the selected product before ordering.
Next step
Use the linked calculator or planning hub to adjust dimensions, waste, coverage, depth, spacing, or product packaging for the real project.
Related guides
FAQ
How many bundles for 1,800 sq ft of roof?
With 15% waste and 3 bundles per square, plan about 63 field-shingle bundles.
Why use 15% waste?
More complex roofs often create more cut waste than simple gable roofs.
Does this include underlayment?
No. Underlayment is estimated by roll coverage separately.