What about walls vs floors?

The math is the same. Use waste appropriate to cuts around outlets, niches, and fixtures.

My box lists coverage in sq ft—can I use that?

Yes. Divide area with waste by box coverage to get boxes, or keep tiles-per-box if that matches the carton.

How is this different from a flooring calculator?

Tile sizing is in inches with an explicit tiles-per-box step. Flooring focuses on material square footage and optional box coverage for planks or sheets.

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Tile Calculator

Room size and tile size → tiles and boxes with a waste buffer.

Waste built in

Box count

Inch tile sizes

Computes room area, applies waste, divides by tile face area, then rounds up tiles and boxes. Educational purchase estimate only.

Limitation: Educational purchase estimate only.

Jump to calculator · Sources & review

Free Calculators HubTile Calculator

Room length (ft)Room width (ft)Tile length (in)Tile width (in)Waste percentExtra for cuts and breakage (often 10% floors, 15% diagonals/complex layouts).Tiles per box

How to Estimate Tile

Measure the room, enter nominal tile face size, set waste, and use tiles per box from the carton.

Enter room length and width in feet.

Use the same dye lot

Buying all boxes at once reduces shade variation. Keep a few spare tiles for future repairs.

What Tiles Needed Means

The primary result is whole tiles after waste. Boxes are that count rounded up by tiles per box.

Worked Tile Examples

12×10 room with 12-inch tiles

Inputs

roomLengthFt:12

roomWidthFt:10

tileLengthIn:12

tileWidthIn:12

wastePercent:10

tilesPerBox:10

Tiles / boxes

132 tiles; 14 boxes

120 sq ft + 10% = 132 sq ft; each tile is 1 sq ft → 132 tiles; 14 boxes of 10.

Smaller room, same tile

Inputs

roomLengthFt:10

roomWidthFt:8

tileLengthIn:12

tileWidthIn:12

wastePercent:10

tilesPerBox:11

Tiles / boxes

88 tiles; 8 boxes

80 + 10% = 88 tiles; 8 boxes of 11.

Diagonals need more waste

Diagonal or complex patterns often need 15%+ waste. Straight lay on a simple rectangle can sit near 10%.

Frequently Asked Questions

No. It uses tile face area only. Narrow joints barely change count; wide decorative joints slightly reduce tiles needed.

Still have questions about this calculation?

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Tile Count Formulas

Ignores grout joint width in the face-area model—nominal tile size is used as coverage.

Formula

length × width (ft)

Room area

length × width (ft)

With waste

area × (1 + waste%/100)

Tile area

(tile length × tile width) ÷ 144

Tiles and boxes

ceil(area with waste ÷ tile area); ceil(tiles ÷ tiles/box)

Scientific Background

Assumptions: rectangular room, nominal tile face coverage. Limitations: no herringbone/diagonal layout multipliers beyond the waste percent you choose.

Sources & review

Tile Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.

Last reviewed

July 22, 2026

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