Tile Calculator

How this tile calculator works

Use this rectangular tile calculator for floors, backsplashes, shower walls, laundry rooms, entries, and other straight-sided tile projects. Enter length and width, then adjust box coverage, grout coverage, thinset coverage, and cut waste. The calculator adds cut waste to the measured area, rounds tile boxes up, and includes accessory quantity rows for grout and thinset.

Cut waste matters because tile layouts rarely use every square foot perfectly. Rooms need perimeter cuts, damaged pieces, layout alignment, and spare tiles for future repairs.

Tile waste reference table

Measuring notes

Measure the tiled surface, not the wall-to-wall room if cabinets, tubs, or permanent islands reduce the tiled footprint. For multiple rooms, estimate each area separately and combine the box counts only when the same tile and dye lot will be used.

Tile layout should be planned before ordering. Center lines, border cuts, doorway transitions, and focal walls can all change waste. A room that is square on paper may still need extra cuts if walls are out of parallel or if the layout is centered on a doorway, island, shower niche, or other visual reference. Keep spare tile from the same dye lot for future repairs because matching color and size later can be difficult.

Box coverage is the most important product-specific input. Some boxes cover a neat number of square feet, while others vary by tile size, pattern, or packaging. Use the coverage printed on the box or product listing, then let the calculator round up to whole boxes. If the project uses multiple tile formats, such as field tile plus border pieces, estimate each product separately.

Grout and thinset quantities are planning rows, not a substitute for product instructions. Trowel size, tile back texture, substrate flatness, joint width, and waste during mixing can all change consumption. Large-format tile may require different mortar, extra floor preparation, or leveling systems. Wet areas may also need waterproofing components that are outside the tile box count.

Regional pricing notes

Tile prices vary widely by material, format, edge quality, brand, and freight. Large-format porcelain, handmade tile, and stone can also raise labor and setting material requirements.

Labor costs vary even more than tile prices because prep work controls the job. Removing old flooring, flattening the substrate, installing underlayment, waterproofing, handling stairs, and cutting around fixtures can exceed the visible tile-setting time. Delivery and breakage matter too; heavy boxes may need curbside delivery or careful staging inside the home.

When to call a professional

Call a professional for showers, wet rooms, heated floors, large-format tile, natural stone, stairs, uneven substrates, or layouts with tight pattern alignment. These projects involve waterproofing, movement joints, flatness standards, and product compatibility decisions that a quantity calculator does not verify. For a simple rectangular floor, the estimate can still help compare bids and check that the ordered box count is reasonable.

Buying and ordering tips

Order tile by box, not by exact square foot. Check the box coverage, lot information, return policy, and lead time before committing. For visible floors, keep attic stock from the same lot for repairs. If a project uses trim pieces, mosaics, or accent tile, those items need separate counts because their coverage and waste are different from field tile. Confirm whether grout, mortar, spacers, leveling clips, backer board, waterproofing, and transitions are included in your material budget. Verify thresholds and reducer strips early because those accessories can affect the final edge layout and ordering schedule. Confirm delivery timing before demolition starts. Keep receipts.

FAQ

What is box coverage?

Box coverage is the square footage one full box of the selected tile covers. Use the product label.

Is grout included in the cost?

The report includes grout quantity rows, but the material cost range is for tile unless you edit pricing to include accessories.

How much waste should I use?

Ten percent works for many straight rectangular layouts. Increase it for diagonal, patterned, or cut-heavy projects.

Should I round boxes manually?

No. The calculator rounds boxes up after waste is applied.

Can I use this for wall tile?

Yes. Enter the wall surface dimensions instead of floor dimensions.

Does this include backer board?

No. Backer board, waterproofing, trim, transitions, and demolition are separate.

Sources and assumptions

Last updated 2026-05-04. The calculator uses the cited reference above, common retail package labels, and editable default assumptions for planning quantities. Confirm product coverage, package yield, price, and local requirements before purchasing materials or scheduling work.