Quick start
- Enter the floor, wall, backsplash, or shower surface area in square feet.
- Enter the tile face length and width in inches. A 12 x 24 tile uses 12 and 24.
- Enter waste percent for cuts, chipped pieces, layout changes, and a few future repair tiles.
Best uses
Use the Tile Calculator when you already have a rough measured area and want a quick count before comparing tile sizes, box coverage, and installer layout notes.
- Estimate floor tile count from square feet.
- Estimate wall, backsplash, or shower tile count.
- Add a waste percentage before buying boxes.
- Compare 12 x 12, 12 x 24, subway, and mosaic tile sizes.
What this calculator is solving
The Tile Calculator estimates whole tiles for a floor, wall, shower, or backsplash from project area, tile dimensions, and waste percent. It is useful before you convert the count into boxes or ask an installer for a final layout.
Match each input label on the calculator to The calculator asks for project area in square feet, tile length in inches, tile width in inches, and waste percent. Those are the same numbers used in the guide examples..
The formula in plain language
In plain language: The calculator uses tile area = tile length inches x tile width inches / 144, adjusted area = project square feet x (1 + waste percent / 100), and tiles needed = ceiling(adjusted area / tile area). The examples on the page are there so you can compare your inputs with a tile-count example before copying the answer.
Tile area = tile length inches x tile width inches / 144. Area with waste = project square feet x (1 + waste percent / 100). Tiles needed = adjusted area divided by tile area, rounded up.
How to read the answer
Read the result as the tile count before box rounding. The supporting numbers show one-tile coverage, waste added, and the adjusted area used for the final division.
- Tiles needed is rounded up to a whole tile. Stores may still sell by the box.
- Each tile area shows the square-foot coverage of one tile before grout joints.
- Area with waste shows the adjusted project area before the tile count is rounded.
- For example, 120 square feet with 12 x 12 inch tile and 10% waste becomes 132 square feet of adjusted area, so the result is 132 tiles.
Common mistakes to avoid
Tile estimates go wrong when people measure the wrong surface, forget waste, or treat the calculator result as the exact store order.
- Do not enter box coverage as the tile size. The size fields are for one tile face.
- Do not use room floor area for shower walls or backsplashes; measure the surface being tiled.
- Do not ignore diagonal layouts, herringbone, niches, benches, drains, or many edge cuts.
- Do not forget that tile is usually sold by full boxes, sometimes with shade-lot or return rules.
- Do not rely on this count for grout, thinset, waterproofing, trim, transitions, or labor.
Quick 120 square foot example
Say the project area is 120 square feet and the tile is 12 by 12 inches. One tile covers 1 square foot because 12 x 12 / 144 = 1.
With 10% waste, the adjusted area is 132 square feet. Divide 132 by 1 and round up, so the calculator returns 132 tiles before you convert the count into boxes.
Floor, wall, and shower areas
For a floor, length times width is usually the starting area. For a wall, backsplash, or shower, measure each rectangle separately, then add the areas together.
Shower tile often needs extra care because niches, benches, valves, drains, waterproofing edges, and small cut pieces can raise waste. Run separate estimates when the floor tile and wall tile are different sizes.
What waste percent means for tile
Waste percent is extra tile added before the calculator rounds up. It covers cuts at walls, broken pieces, layout changes, chipped corners, and a few spare tiles for future repair.
A simple straight layout may be close with about 10% waste. Diagonal layouts, herringbone, small rooms with lots of cuts, or expensive patterned tile often need a higher allowance.
Boxes, grout, and layout checks
After you get a tile count, check the product box. Some boxes list tiles per carton, some list square feet per carton, and some stores only sell full boxes.
Grout spacing is a layout check, not a hidden input here. Wider joints, starting lines, cut rows, trim pieces, and pattern direction can change the final order even when the rough count is right.
Metric measurements
This calculator expects square feet and inches. If your measurements are metric, convert square meters to square feet and centimeters to inches before entering them.
Keep every input in the same unit system. Mixing square meters with inch tile sizes without converting first is one of the easiest ways to get a bad tile count.
Research and references
These references support the tile-count math, unit conversions, and reader-first limits used in this guide.
Worked examples for Tile Calculator
132 tiles
110 tiles
387 tiles
347 tiles
FAQ in plain language
When should I use the Tile Calculator?
Use it when your task matches one of these common needs: Estimate floor tile count from square feet. Estimate wall, backsplash, or shower tile count. It works best when you already know project square feet, tile length and width in inches, and the waste percent you want to add.
What is the Tile Calculator doing with my inputs?
In plain language: The calculator uses tile area = tile length inches x tile width inches / 144, adjusted area = project square feet x (1 + waste percent / 100), and tiles needed = ceiling(adjusted area / tile area). The examples on the page are there so you can compare your inputs with a tile-count example before copying the answer.
What do the main Tile Calculator inputs mean?
Project area (ft2): the floor, wall, backsplash, or shower surface area before extra tile is added. Tile length and width (in): the visible face size of one tile, not the box size or carton coverage. Waste (%): extra tile for cuts, breakage, pattern layout, chipped corners, and a few future repair pieces. Tiles needed: the rounded-up tile count before you convert it to boxes or cartons.
How should I read the Tile Calculator answer?
Read the headline estimate first, then check the material, waste, coverage, and unit lines. For project tools, the supporting lines are often the difference between a rough idea and a list you can actually shop from.
What should I double-check before trusting the answer?
This is a planning count, not a full installer takeoff. Real projects can change with grout joints, layout direction, cuts at edges, diagonal or herringbone patterns, broken pieces, spare tiles, box coverage, shade lots, trim, thinset, waterproofing, and store rounding. Also check the tile box coverage, tiles per box, grout joint, layout pattern, shade lot, and whether floor, wall, or shower surfaces should be measured separately.
How many 12 x 12 tiles do I need for 120 square feet?
A 12 x 12 inch tile covers 1 square foot. For 120 square feet with 10% waste, the calculator uses 132 square feet and returns 132 tiles.
Can I use this as a shower tile calculator?
Yes for a first count. Measure each shower wall or floor area, add the square feet together, and use a higher waste percent if there are niches, benches, plumbing cuts, mosaics, or many small pieces.
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Keep exploring
If this guide is close but not exact, these links keep you near the same kind of problem.
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Privacy and copying results
Recent answers stay visible only while you work in the current browser tab. They are not sent to a server.
Use Copy answer when you want to save the inputs and result in notes, homework, a message, or a project list. Check the units, labels, and limits before copying.