Calculate carpet cut size, room length, or width from any two values with feet, meters, inches, yards, and square unit conversions.
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Carpet Cut Formula
The carpet cut calculator is based on the area formula for a rectangular room. Enter any two values, and the missing value is calculated from the same relationship between length, width, and carpet cut size.
- C = carpet cut size, or total carpet area
- L = length of the room
- W = width of the room
The calculator first converts the length and width measurements into feet when needed. It then performs the area calculation in square feet and converts the result back to the unit you selected.
- 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?
For a simple rectangular room, adding about 5% to 10% is common. Rooms with unusual shapes, patterned carpet, or multiple seams may need more. The calculator gives the base cut area, so add waste after you get the result if your project requires it.
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.
