Shingle Count
Estimate the roof shingle bundles needed.
About Shingle Count
Roofing is sold by bundles, each covering a fixed area. Multiplying the roof area by a waste allowance and dividing by bundle coverage gives the order quantity. Roof waste from cuts at hips and valleys is substantial, so a bundle calculator with an allowance prevents running short.
Formula
Shingle Count
Bundles = area x (1 + waste) / bundle coverage
- bundle
- Package of shingles covering a set area
Worked example
With the default values below, Shingle Count returns Bundles Needed of 40. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Roof area
- 1,200 sq ft
- Bundle coverageminimum 1 sq ft
- 33.3 sq ft
- Waste allowanceaccepts 0–30 %
- 10 %
Results
- Roof Squares
- 12.0 squares
- Area With Waste
- 1,320 sq ft
- Bundles Needed
- 40 bundles
Step by step
- 1Values used
- 2Shingle Count
- 3Bundles Needed= 40 bundles
- 4Roof Squares= 12.0 squares
- 5Area With Waste= 1,320 sq ft
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Shingle Count calculated?
Bundles = area x (1 + waste) / bundle coverage Roofing is sold by bundles, each covering a fixed area. Multiplying the roof area by a waste allowance and dividing by bundle coverage gives the order quantity.
Why does Shingle Count matter?
Roof waste from cuts at hips and valleys is substantial, so a bundle calculator with an allowance prevents running short.
What values do I need to enter?
This calculator takes 3 inputs: Roof area, Bundle coverage, Waste allowance. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.