Carpet Sizes Common sizes include 5 x 8 feet, 6 x 9 feet, and 8 x 10 feet. For larger areas, you might find sizes like 8 x 10 feet, 10 x 12 feet, and 10 x 14 feet. In smaller spaces such as entryways or in front of bathroom sinks, you can expect sizes like 3 x 5 feet and 4 x 6 feet.

Add each room's total together to get the total square footage of carpet you need. Multiply this number by 0.1 and add that result to the total square footage. This adds 10% to the total, ensuring you buy enough carpet to get the job done.

Measure the width and the length of this area; (including the height and width of the top step) and multiply the measurements to calculate how much carpet you'll need. Use metric measurements, and again, remember to add 10 centimetres to all your total length and width measurements.

The standard width for machine-made carpet rolls are fixed widths of 12 feet and 13 feet 6 inches. When rooms are wider than these standard sizes and require extra coverage, carpets are seamed together.