Home Improvement
Floor area to cover
The room area inflated by the waste allowance. This is the total material you need, not the area of the floor.
The Formula
A = room length x room width x (1 + W)
The room area inflated by the waste allowance. This is the total material you need, not the area of the floor.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| A | Area to cover | square feet | Room area plus the cutting allowance. |
| L | Room length | feet | Measured along the longest wall. |
| B | Room width | feet | Measured across the room. |
| W | Waste allowance | ratio | Cutting losses as a decimal fraction. |
What Each Symbol Means
Asquare feet
Area to cover
Room area plus the cutting allowance.
Lfeet
Room length
Measured along the longest wall.
Bfeet
Room width
Measured across the room.
Wratio
Waste allowance
Cutting losses as a decimal fraction.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate flooring 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 Flooring Needed, filed under Everyday Life. Every number the guide produces comes from substituting into this one line.