🏠 Carpet Calculator
Estimate carpet area and square yards for rooms and hallways.
What is this tool?
A carpet calculator is a home improvement tool that estimates how much carpet material you need for a room, hallway, or entire home. Carpet is sold by the square yard in the United States and by the square meter in most other countries, which makes converting from room dimensions to purchase quantities a common source of confusion. Carpet also comes in rolls of specific widths, typically 12 feet or 15 feet, which means you may need more material than the raw room area suggests due to seam placement and pattern matching. A good carpet calculator accounts for both the room area and a waste factor for cuts, seams, and pattern repeats. Whether you are carpeting a single bedroom, a staircase, or an entire house, accurate estimation helps you budget correctly and avoid the costly mistake of ordering too little carpet and being unable to finish the installation.How it works
The calculator multiplies the room length by the room width to get the total square footage. It then divides by 9 to convert square feet to square yards, since one square yard equals 9 square feet. A waste factor of 10 percent is added to account for cuts, seams, and pattern matching, which is standard for most residential carpet installations. The formula is: square feet = length times width; square yards = square feet divided by 9; carpet needed = square yards times 1.10 (with 10 percent waste).How to use
- Measure the longest length and widest width of the room in feet. Measure into doorways and alcoves to ensure full coverage.
- For L-shaped rooms or irregular layouts, divide the space into rectangles, measure each separately, and add the areas together.
- Enter the room dimensions and the calculator will display square feet, square yards, and the recommended carpet amount with waste included.
- When ordering carpet, note the roll width available from your supplier. If the room is wider than the roll, you will need a seam, which requires extra material for pattern matching.
- For stairs, measure the tread depth and riser height, multiply by the number of stairs, and add this to the room total. Stairs typically require about 1 square yard per stair.
Frequently Asked Questions
Frequently Asked Questions
How much carpet do I need for a 12x12 room?
A 12 by 12 foot room has 144 square feet, which equals 16 square yards. With a 10 percent waste factor, you need approximately 17.6 square yards of carpet. This accounts for cuts and fitting around doorways.
How do I convert square feet to square yards?
Divide the total square feet by 9 to get square yards. For example, 180 square feet divided by 9 equals 20 square yards. Carpet pricing in the United States is typically quoted per square yard.
How much extra carpet should I buy for waste?
For straightforward rectangular rooms, add 10 percent. For rooms with alcoves, angled walls, or diagonal layouts, add 15 percent. For patterned carpets that require pattern matching at seams, add 20 percent or consult the manufacturer instructions.
How wide is a standard carpet roll?
In the United States, standard carpet rolls are 12 feet wide. Some commercial and luxury residential carpets come in 15-foot widths. In countries using the metric system, rolls are typically 4 meters or 5 meters wide. If your room is wider than the roll, a seam will be needed.
Tips & Advice
When budgeting for carpet, remember to include the cost of padding or underlay, tack strips, transition strips, and installation labor in addition to the carpet itself. The total installed cost can be double the carpet-only price. For high-traffic areas like hallways and stairs, choose a denser carpet with a lower pile height for better durability. For bedrooms and living rooms where comfort is prioritized, a plush deeper pile is appropriate. Always request carpet from the same dye lot for multi-room installations to avoid visible color differences. Professional measurement before ordering is recommended for complex layouts or whole-home carpeting.