Carpet Calculator
Estimate carpet in square yards using the roll-width layout, so offcut waste is real rather than guessed.
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What this tool does
Estimate carpet in square yards using the roll-width layout, so offcut waste is real rather than guessed. Carpet is sold by the square yard in the US, so area outputs carry a sq yd suffix rather than a convertible unit. Seams are assumed to run along the room length; patterned carpet needs extra for pattern match.
How to use the Carpet Calculator
- Enter or select length in ft.
- Enter or select width in ft.
- Enter or select carpet roll width.
- Enter or select price per square yard (installed material).
- Read the calculated result; change any measurement to compare alternatives.
Formula
strips = ceil(room width / roll width); linear ft = strips × room length; purchased area = linear ft × roll width; sq yd = area / 9
- length
- Length (ft, before metric conversion)
- width
- Width (ft, before metric conversion)
- roll
- Carpet roll width
- price
- Price per square yard (installed material)
Carpet is sold by the square yard in the US, so area outputs carry a sq yd suffix rather than a convertible unit. Seams are assumed to run along the room length; patterned carpet needs extra for pattern match.
Worked example
For carpet calculator, the following measurements illustrate the exact method: Length: 20; Width: 10; Carpet roll width: 12; Price per square yard (installed material): 45.
Inputs
- Length20 ft
- Width10 ft
- Carpet roll width12 ft
- Price per square yard (installed material)45
Result
- Carpet to buy26.67 sq yd
- Linear feet off the roll20 ft
- Strips across the room1
- Net room area22.22 sq yd
- Cutting waste (%)20
- Estimated material cost$1,200.00
Results explained
- Carpet to buy
- Carpet to buy from the formula above. Carpet is sold by the square yard in the US, so area outputs carry a sq yd suffix rather than a convertible unit. Seams are assumed to run along the room length; patterned carpet needs extra for pattern match.
- Linear feet off the roll
- Linear feet off the roll from the formula above, expressed in ft before metric conversion. Carpet is sold by the square yard in the US, so area outputs carry a sq yd suffix rather than a convertible unit. Seams are assumed to run along the room length; patterned carpet needs extra for pattern match.
- Strips across the room
- Strips across the room from the formula above. Carpet is sold by the square yard in the US, so area outputs carry a sq yd suffix rather than a convertible unit. Seams are assumed to run along the room length; patterned carpet needs extra for pattern match.
- Net room area
- Net room area from the formula above. Carpet is sold by the square yard in the US, so area outputs carry a sq yd suffix rather than a convertible unit. Seams are assumed to run along the room length; patterned carpet needs extra for pattern match.
- Cutting waste (%)
- Cutting waste (%) from the formula above. Carpet is sold by the square yard in the US, so area outputs carry a sq yd suffix rather than a convertible unit. Seams are assumed to run along the room length; patterned carpet needs extra for pattern match.
- Estimated material cost
- Estimated material cost from the formula above. Carpet is sold by the square yard in the US, so area outputs carry a sq yd suffix rather than a convertible unit. Seams are assumed to run along the room length; patterned carpet needs extra for pattern match.
Frequently asked questions
Divide the room width by the roll width and round up to whole strips, multiply by the room length for linear feet, then by the roll width for purchased area. Divide by 9 for square yards.
Carpet comes in fixed roll widths (12, 13.5, 15 ft). A 13 ft wide room on a 12 ft roll needs two strips — you buy 24 ft of width for 13 ft of room unless the offcut fits another room.
Nine. A 12 × 10 ft room is 120 sq ft = 13.3 sq yd net, before roll-width waste.
Along the room's length, away from main light where possible, and never across the main traffic path at a doorway if it can be avoided.
No — the cost line is carpet material at your price per square yard. Pad is bought by the same purchased area; installation is usually quoted separately.