Home Improvement
Rolls required
Divide the wall area by the usable coverage of one roll.
The Formula
rolls = wall area / coverage per roll
Divide the wall area by the usable coverage of one roll.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| R | Rolls | rolls | The number of rolls to buy. |
| A | Wall area | square feet | The area to be papered, in square feet. |
| c | Coverage | square feet | The usable area one roll covers, allowing for matching. |
What Each Symbol Means
Rrolls
Rolls
The number of rolls to buy.
Asquare feet
Wall area
The area to be papered, in square feet.
csquare feet
Coverage
The usable area one roll covers, allowing for matching.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate wallpaper 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 Wallpaper Needed, filed under Everyday Life. Every number the guide produces comes from substituting into this one line.