Carpet calculator
Choose carpet in the menu. Drops are the room width divided by the roll width, rounded up. Feet to buy are drops times the room length, then the waste percent. A 12 by 12 room on a 12 foot roll is 1 drop and 13.200000000000001 feet at 10%.
A 12 by 12 room is 144 square feet of plank. A plank that is 6 inches by 4 feet is 2 square feet. The default in the form is half a square foot so you can see the rounding. Type the plank you are buying. Room area can come from square feet. Grouted tile is tile. Base at the wall is baseboard.
FAQ
How do I count planks?
One plank’s area is width times length. Divide the room by that area, add the cut allowance, and round up. Boxes are the piece count divided by how many the box holds.
How much carpet for a 12 by 12 room?
A 12 foot roll covers a 12 foot width in 1 drop. You buy 12 feet of carpet before waste, and 13.200000000000001 feet at 10% for seams and doorways.
Sources
- NIST Handbook 44: Square feet of the room and of one plank.