Flooring & Tile · Project planning

Carpet Calculator

Compare both rectangular roll orientations, then lock pile direction when required. Pattern repeats and trim are applied to each drop rather than only to total area.

By Alish Gautam, Software Developer · Updated · Calculation methodology

Start with the editable example below. Dimensions retain their physical size when units change. Region sets currency labels without converting currencies; confirm entered quotes after changing region.

Measured rooms and floor surfaces

Use non-overlapping rectangles. Enter openings as area on the surface they interrupt.

Room / surface 1
Basic settings
Choose the estimating method.
Auto compares both orientations independently per room. Length or width locks the same axis for all rooms.
Product settings
Product and system dimensions
Editable arithmetic example. Replace with your project or product specification.
Optional supplier product name, chart revision or quote reference, saved in shared project state.
Advanced settings
Advanced planning settings
Zero means no pattern repeat. Repeat matching across drops needs installer verification.
Includes both ends; enter the combined allowance.
Planning allowance, not a code or industry requirement. Set zero to order the exact rounded takeoff.
Cost settings · USD
Optional quote prices
Optional supplier quote in the selected currency. Blank omits cost.

Project takeoff

Whole packages round up. Allowance is separate from purchased surplus. Prices omit labor, delivery, tax and other items unless explicitly entered.

Gross measured area
120 ft²
Opening / exclusion deductions
0 ft²
Linear roll length including allowance
13.75 ft
Purchased roll area
165 ft²
Surplus over gross room area
45 ft²
Total seams
0

Supplier-ready material list

Linear roll length
13.75 ft

Check before ordering

  • Confirm pile direction and seam locations with the installer before ordering.
Geometry / layout breakdown
Dimensions use the selected measurement system.
RoomOrientationSelectedDropsDrop length (ft)Roll length (ft)
Room / surface 1lengthyes112.512.5
Room / surface 1widthno210.521

Minimum material orientation can conflict with pile direction, light, seams or installation practice. Each room rounds separately; no cross-room offcut reuse is assumed.

How it works

Drops = ceil((across dimension + trim) / roll width). Each drop length rounds upward to a pattern repeat; total roll length = drops × adjusted drop.

Assumptions and limitations

Minimum material orientation can conflict with pile direction, light, seams or installation practice. Each room rounds separately; no cross-room offcut reuse is assumed.

Whole packages round upward after the chosen allowance. Physical geometry and purchase reserve are separate. Manufacturer and project specifications override editable examples; the selected region does not establish a local code requirement.

Sources and boundaries

Carpet and Rug Institute: Installation Standards — CRI 104 and 105

Open the source · CRI 104/105; official page references 2015 update · Reference checked 2026-10-04

Scope: Residential and commercial carpet installation guidance

Used for: Carpet seam and installation context.

Does not establish: Sheet-vinyl installation requirements; Automatic optimal roll orientation; Universal roll width.

Official page identifies the 2015 update and current downloadable standards.