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Carpet calculator

Compare strips running along either room dimension: strip count × (strip length + trim allowance) × roll width.

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More inputs and assumptions

Answer

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Compare strips running along either room dimension: strip count × (strip length + trim allowance) × roll width.

More results
Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
Saved scenario
Save the current answer, then change an input to compare. This clears when you leave.
Formula and assumptions
Rectangular room and constant roll width. Both orientations are compared; seams run along the strips. No pattern repeat, stairs, closets or cutting reuse is modeled. Confirm pile direction and seam placement before ordering. The allowance is added once to each strip length.
Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
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Using Carpet calculator
Compare strips running along either room dimension: strip count × (strip length + trim allowance) × roll width.
Rectangular room and constant roll width. Both orientations are compared; seams run along the strips. No pattern repeat, stairs, closets or cutting reuse is modeled. Confirm pile direction and seam placement before ordering. The allowance is added once to each strip length.
Next: Tile calculator
Next: Area converter
A worked example
For room length (feet) = 15, room width (feet) = 10, carpet roll width (feet) = 12, extra length per strip (feet) = 1, carpet to buy (square feet) = 192.
Before you use the result
Rectangular room and constant roll width. Both orientations are compared; seams run along the strips. No pattern repeat, stairs, closets or cutting reuse is modeled. Confirm pile direction and seam placement before ordering. The allowance is added once to each strip length.
Example results for room length (feet)
These examples use Room width (feet): 10; Carpet roll width (feet): 12; Extra length per strip (feet): 1. They are reference calculations, not recommended settings.
Room length (feet)Carpet to buy (square feet)
7.5102
15192
30372
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ToolOctopus. “Carpet calculator.” Updated 2026-09-29. https://tooloctopus.com/carpet-calculator.
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