CalcaTools

Tile Calculator | Estimate Tiles, Waste, Grout, and Cost

Estimate how many tiles you need for any room — including cutting waste, grout, adhesive, and the full material cost. Enter the room and tile dimensions, choose the waste percentage for your layout, and get whole-tile counts rounded up so you order exactly the right quantity.

Last updated: August 2026 · Free · No sign-up required

A tile calculator estimates tile count, cutting waste, grout area, adhesive, and material cost from floor or wall dimensions and tile size.

How this calculator works

How tile quantity is estimated

The calculator converts room dimensions and tile dimensions into the same unit, calculates surface area, adds a cutting and breakage allowance, and rounds up to a whole number of tiles or boxes. Optional grout and adhesive coverage inputs extend the estimate to the main installation materials.

Waste allowance

Straight layouts often need less waste than diagonal, staggered, or patterned layouts. Add more waste for irregular rooms, many cuts, or future replacement tiles. Product packaging and local prices vary, so use the result as a planning estimate.

Worked example

Scenario: A 12 ft by 10 ft surface uses 12 in square tiles with 10% waste.

Result: The calculator rounds the tile count upward and estimates grout, adhesive, and material cost from the coverage and price inputs.

Frequently asked questions

How much tile waste should I add?

Ten percent is a common starting point for a straightforward layout, but diagonal, patterned, or irregular installations may need more. Use the waste field to match your project.

Can tile dimensions and room dimensions use different units?

Yes. The calculator converts tile dimensions entered in inches to feet for a room measured in feet. Keep the labels visible and check the units before calculating.

Does the calculator estimate grout and adhesive?

Yes, when you enter coverage and price for each material. The result rounds each unit count upward and adds the estimated material costs.

Should I buy extra tiles for repairs?

Keeping spare tiles from the same production lot is useful for future repairs. Add a little more waste when the surface is irregular or replacement matching may be difficult.

How are whole tiles calculated?

The calculator divides the surface area by the area of one tile, applies the waste allowance, and rounds up to a whole-tile quantity so the estimate does not understate the purchase.

Does the tile calculator include labor?

No. It estimates tiles, waste, grout, adhesive, and material cost only. Installation labor, delivery, substrate preparation, and disposal should be estimated separately.

Quick reference

Tile SizePieces per BoxCoverage per Box (sq ft)
12 × 12 in1010
12 × 24 in816
24 × 24 in416
6 × 24 in (plank)1212
18 × 18 in613.5

grid_view Count whole tiles

content_cut Allow for waste

format_paint Plan installation materials

lightbulb Worked example

Tiling a 10x12 ft bathroom floor with 12x12 inch tiles, straight layout.

Result: 132 tiles (11 sq ft boxes of 12).

Formula & methodology

Formula: surface area = length × width; tiles = surface area ÷ tile area × (1 + waste); grout and adhesive use coverage rates

How tile quantity is estimated

The calculator converts room dimensions and tile dimensions into the same unit, calculates surface area, adds a cutting and breakage allowance, and rounds up to a whole number of tiles or boxes. Optional grout and adhesive coverage inputs extend the estimate to the main installation materials.

Waste allowance

Straight layouts often need less waste than diagonal, staggered, or patterned layouts. Add more waste for irregular rooms, many cuts, or future replacement tiles. Product packaging and local prices vary, so use the result as a planning estimate.

Authoritative source: Tile Council of North America Installation Resources

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