Calculate rectangular carpet area, room length, or room width using feet, meters, inches, yards, and square unit conversions. Select the quantity to solve for and enter the two known values. This is a geometric area calculation, not a roll-width cutting plan.
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Carpet Cut Formula
The carpet cut calculator is based on the area formula for a rectangular room. Select area, length or width, then enter the other two quantities. The result follows the same rectangular relationship between length, width and carpet cut area.
- C = carpet cut size, or total carpet area
- L = length of the room
- W = width of the room
The calculator converts measurements consistently, applies the rectangular area relationship and returns the selected result unit. One square yard equals 9 square feet; unit factors are kept unrounded during calculation.
- To calculate carpet cut size: multiply the room length by the room width.
- To calculate room length: divide the carpet cut size by the room width.
- To calculate room width: divide the carpet cut size by the room length.
Common Carpet Area Unit Conversions
Use these conversions to check carpet measurements when dimensions are given in different units.
| Unit | Equivalent | Use |
|---|---|---|
| 1 square foot | 144 square inches | Small cuts or detail measurements |
| 1 square yard | 9 square feet | Common carpet sales unit |
| 1 square meter | 10.7639 square feet | Metric room plans |
Typical Room Carpet Cut Sizes
| Room Size | Carpet Cut Area | Approx. Square Yards |
|---|---|---|
| 10 ft × 10 ft | 100 sq ft | 11.11 sq yd |
| 12 ft × 12 ft | 144 sq ft | 16 sq yd |
| 12 ft × 15 ft | 180 sq ft | 20 sq yd |
| 15 ft × 20 ft | 300 sq ft | 33.33 sq yd |
Example Carpet Cut Calculations
Example 1: Find the carpet cut size
You have a room that is 12 feet long and 10 feet wide.
The carpet cut size is 120 square feet.
Example 2: Find the missing width
You know the carpet cut size is 168 square feet and the room length is 14 feet.
The room width is 12 feet.
FAQs
Does carpet cut size include extra waste?
No. The basic carpet cut size from length times width gives the exact rectangular area of the room. In real installations, you may need extra carpet for trimming, seams, stairs, pattern matching, closets, or irregular corners.
How much extra carpet should you add?
The extra amount depends on roll width, room layout, seams, trimming and pattern matching. This calculator gives the base rectangular area. Confirm the purchase quantity and allowance with your installer instead of treating one percentage as sufficient for every project.
Can you use this for rooms that are not rectangular?
Yes, but you should split the room into smaller rectangles first. Calculate the carpet cut size for each rectangle, then add the areas together. For example, an L-shaped room can usually be divided into two rectangular sections.
