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Tile Calculator (Floor & Wall Tiles Needed)

Estimate how many floor or wall tiles you need from room size and tile size, with metric or imperial units and 10%, 15%, or 20% waste factors.

Content updated October 7, 2026 · Details

Published

Content updated

Recorded calculation check · Verification scope

Tiles needed

Inputs ↓
Total tiles to purchase
138 tiles
Room area
120.00 square feet
Tile size
12 × 12 inches
Tile area
1.000 square feet each
Base tiles needed
120 tiles
Extra tiles (15% waste factor)
18 tiles
Boxes
12 boxes

Waste is applied once to the unrounded tile count, then tiles and boxes are rounded up. Verify actual product coverage and cut allowance.

Measurement unit
ft
ft
in
in

Results update as you type.

Result links include your inputs in the URL. Anyone with the link can read them; avoid sharing sensitive values.

Compare scenarios

Save a result, change your inputs, then compare. Up to three saved scenarios for this visit.

Worked example

measurementUnit: feet · roomLength: 12 · roomWidth: 10 · tileLength: 12 · tileWidth: 12 · wasteFactor: low · tilesPerBox: 12

Result: 132 tiles

Try it →

This tile calculator estimates how many floor or wall tiles you need to buy from room size, tile size, metric or imperial units, and a 10%, 15%, or 20% waste factor for layout complexity.

Inputs and method

Enter room and tile dimensions, a selected planning allowance, and tiles per box. The selected 10%, 15%, or 20% is an input scenario, not a universal installation rule. It is applied to the unrounded area-based tile count; tiles are rounded up once with floating-point tolerance for mathematically exact integers, then boxes are rounded up from that purchase count.

Calculations retain full floating-point precision until the labeled display step. Counts and packages use an explicit upward ceiling only where a whole purchase unit is required.

Interpreting the estimate

Use the result as a planning value and keep input precision consistent with the measurements or source data you have. Small displayed differences can come from final-place rounding; intermediate values are not rounded.

Assumptions and limits

Actual coverage, grout joints, layout, cuts, breakage, pattern matching, and package quantities are product- and project-specific inputs. Measure the room first with the square footage calculator; for the concrete underlayment or slab beneath, see the concrete calculator; and for a complementary masonry material, pair the estimate with the brick calculator.

Empty entries, invalid numbers, prohibited negatives, zero denominators, impossible relationships, and unsupported options trigger a validation message instead of a misleading result.

Keep area estimates separate from layout decisions

Compare tile sizes with room dimensions and layout complexity fixed, retaining tiles-per-box with the purchase estimate. The area calculation does not create a cutting plan or establish how partial tiles can be reused. Verify the actual layout and product packaging separately.

Keep a purchasing checklist beside the area estimate

After obtaining the estimate, keep these three checks with the order:

  1. Confirm the active room and tile dimensions use their selected units.
  2. Record layout complexity with the calculated count rather than discarding the waste assumption.
  3. Match tiles per box to the product actually being purchased.

The calculator estimates from area and its selected allowances. It does not decide the starting line, cut reuse, pattern alignment, or package availability; those are separate layout and purchasing questions to resolve before ordering.

Sources

  • Area measurement — supports SI area units and conversions; the geometric arithmetic is independently derived.

  • NIST, “SI Units” — SI unit definitions behind the metric tile and room dimensions.

Compare Tile Calculator (Floor & Wall Tiles Needed) with related tools

All comparisons →
Brick vs TileCompare the brick calculator's unit-masonry wall takeoff with the tile calculator's floor and wall tile count for home building and finishing projects.Concrete vs Tile CalculatorCompare concrete and tile calculators: one estimates poured-concrete volume and bags for slabs and columns, the other counts tiles and boxes for floors and walls.Tile vs Deck Material CalculatorCompare tile and deck material calculators: both estimate surface-covering materials with waste and whole-unit rounding, but one sizes interior floors and walls while the other takes off an outdoor deck.Tile vs Square FootageCompare the tile calculator's material purchase estimate with the square footage calculator's room area measurement for flooring and wall projects.

Frequently asked questions

How many tiles do I need?

The calculator divides the net room area by the tile face area, applies the selected waste factor to the unrounded area-based count, rounds up once to whole tiles with a floating-point tolerance for exact integers, and then rounds boxes up from that purchase count.

What waste factor should I use?

The page offers 10, 15, or 20 percent waste factors for layout complexity. The selected percentage is an input scenario, not a universal installation rule; actual coverage, grout joints, cuts, breakage, and pattern matching are product- and project-specific.

What inputs does the estimate need?

Enter room and tile dimensions, a selected planning allowance, and tiles per box, in metric or imperial units. Measure the room first with the square footage calculator, and pair the estimate with the concrete or brick calculator for related materials.

Sources

  • Area measurement

    secondary · Aug 10, 2026

    Supports: Area unit relationships behind metric/imperial tile-area conversion.

  • NIST, "SI Units"

    secondary · Aug 10, 2026

    Supports: SI unit definitions behind the metric tile and room dimensions.

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Tile Calculator (Floor & Wall Tiles Needed) updated at

Recorded calculation check

Corrected — see corrections historyFound an error? Report it