Home Improvement
Squares and bundles
Converts adjusted area into the units the supplier uses.
The Formula
squares = area x (1 + waste) / 100, bundles = squares x 3
Converts adjusted area into the units the supplier uses.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| squares | Squares | squares | Units of 100 square feet. |
| bundles | Bundles | bundles | Three bundles per square for standard shingles. |
| waste | Waste allowance | decimal | A decimal fraction, so 0.10 for ten percent. |
What Each Symbol Means
squaressquares
Squares
Units of 100 square feet.
bundlesbundles
Bundles
Three bundles per square for standard shingles.
wastedecimal
Waste allowance
A decimal fraction, so 0.10 for ten percent.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate shingles needed page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Shingles Needed, filed under Everyday Life. Every number the guide produces comes from substituting into this one line.