Rooms larger than 12’ in length and width require more than 1 continuous piece of 12’ carpet or vinyl to cover the floor. Because both carpet and vinyl must always be laid with pieces running in the same direction, the calculation is more involved than a simple square footage formula.
Here is a step-by-step formula you may use to calculate the minimum number of lineal feet of 12’ floor covering required to cover a given area:
1. Make sure your dimensional measurements are accurate. Then, draw a diagram of the room.
2. Determine the direction the floor covering should run. Indicate this on you drawing.
3. Determine your first “run”: the full 12’ width of floor covering that goes down first. Draw this in on your diagram. Note its length, i.e.: 12’ x 16’.
4. Determine the dimensional measurement of your “fill”: that area of the floor left to be covered by floor covering. You should note this as a given width by given length, i.e.: fill = 3’ x 16’.
5. If the width of your fill is 1’, 2’, 3’, 4’ or 6’, use it as is. If it is some other dimension less than 6’, round it up to the next larger of the numbers list above. Take the number you now have and divide it into 12’. The result is the number of pieces it will be possible to cut from a 12’ width and use to cover the width of the fill area.
6. Take the answer to the preceding equation, and divide it into the length of the fill. The answer to this equation will be the number of lineal feet of 12’ floor covering required to cover the fill. To determine total amount of carpet needed for room, add this amount to length of first run.