Floors & Walls Calculators
Measure area first, then plan coverage, allowance and whole packages.
Square Footage
Room, wall or project area from feet and inches or metric dimensions.
Flooring
Flooring coverage, cartons, allowance and optional material cost.
Tile
Floor and wall tiles, boxes, allowance and coverage.
Paint
Separate wall and ceiling paint from coverage and coats.
Drywall
Sheet counts from wall and ceiling areas, layers and sheet sizes.
Start with the right measurements
Keep floor and wall area separate. Record the measured surface before considering an allowance, coats or whole packages.
Measure floor and wall area separately
Start with Square Footage when you need the area of one rectangle or several separate rectangles. Sketch irregular rooms as nonoverlapping parts and record what each part represents. A floor footprint does not describe the wall area of a room: wall height, perimeter and openings need their own measurements. Keep the original measurements available so you can check the estimate.
Flooring coverage and cartons
For one flooring product, add the room areas before applying an allowance or rounding cartons. Read the actual carton coverage from the product label. The Flooring Calculator separates net area, allowance-adjusted coverage and whole-carton purchase coverage. It does not arrange planks, optimize cuts or guarantee that offcuts can be reused in another room.
Tile dimensions and edge cuts
Tile uses actual tile face dimensions for its area estimate. A separate straight-grid check can reveal a higher count caused by edge cuts, but it is not an optimized cutting layout. Confirm tiles per box and installation requirements. Grout spacing does not reduce the face-area purchase estimate, and this tool does not estimate mortar or grout quantities.
Paint coverage and coats
Paint needs wall measurements and any opening deductions. Choose coverage per coat from the label, then enter the number of coats and selected can size. Wall and ceiling paint are separate products and round to cans separately. Moving from a measured floor area to Paint opens the tool for fresh wall measurements; it does not assume a wall area.
Drywall sheets and layers
Drywall uses net surface area, the selected number of layers and actual sheet dimensions. Its pooled area estimate assumes useful offcut reuse, so openings may not reduce the real order as much as the arithmetic suggests. Verify the sheet layout, board system and attachment design separately. Compare each calculator’s assumptions with the actual product before using an estimate to prepare a material list.
Guides
How to Measure Square Footage of a Room
Learn how to measure room square footage accurately, including rectangular and irregular rooms, alcoves, closets and common measurement mistakes.
Paint Coverage per Gallon: What the Numbers Really Mean
Understand paint coverage per gallon, how coats and wall condition change the estimate, and how to turn measured area into practical container quantities.