Quick answer
Tile Calculator: what it calculates
Tile Calculator calculates tile needed from area, tile size and waste percent. The core method is Tiles = area x (1 + waste percent) / tile area; boxes = area with waste / box coverage.
Everyday Calculators
Tile Calculator
Use this tile calculator to estimate how many tiles or boxes to buy before starting a floor, wall, bathroom, or backsplash project.
Reviewed May 25, 2026EstimateFormula shown
ResultTile needed
InputsArea, Tile size, Waste percent, Box coverage, Price per square foot
FormulaTile calculator formula
Live calculator
Tile
Tile to buy132 sq ft
Includes 10% waste.
Estimated tiles132
1 sq ft per tile.
Boxes needed9
Rounded up from 16 sq ft per box.
Material cost$462.00
Area with waste multiplied by price per square foot.
Formula
Tile calculator formula
Tiles = area x (1 + waste percent) / tile area; boxes = area with waste / box coverageTile length and width are converted from inches to square feet before tile count is calculated.
How to use
Steps
- Enter the floor or wall area in square feet.
- Enter tile length and width in inches.
- Add a waste allowance for cuts, breakage, and pattern matching.
- Enter box coverage and price per square foot to estimate boxes and cost.
Example
Sample calculation
Area120 sq ft
Waste10%
12 in x 12 in tile132 tiles
16 sq ft boxes9 boxes
Calculator use
Best for
- Quick tile needed from area, tile size and waste percent.
- Quick everyday math with the result and formula in one place.
- Shopping, date, time, unit, school, or household comparisons.
- A fast check before moving the numbers into a spreadsheet.
Before relying on it
Check first
- Entering area, tile size and waste percent from different time periods or scenarios.
- Mixing units, dates, or original values across the same calculation.
- Rounding early and then using the rounded number in another step.
- Copying a result without checking whether the inputs match the real-world question.
Details
What to know before using the result
These notes make the assumptions explicit, especially where the same search query can mean slightly different things.
Tile areaInches to square feet
A 12 by 12 inch tile covers 1 square foot. Larger or smaller tile dimensions change the tile count.
Waste bufferCuts and breakage
Straight layouts may need less waste than diagonal patterns, complex rooms, or fragile tile.
Box roundingRound up
Boxes are rounded up because tile is usually sold by full box, and extra tile helps with repairs.
Source notes
References used for this calculator
Benchmarks
How to read the result
The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions.
5% - 10%Simple layout waste
Useful for square rooms and straight patterns with limited cuts.
10% - 15%Common planning range
Often safer for bathrooms, walls, and rooms with more cuts.
15%+Complex layout
Consider more waste for diagonals, patterns, niches, stairs, or fragile tile.
Calculator accuracy
Methodology and assumptions
The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.
Formula
Tiles = area x (1 + waste percent) / tile area; boxes = area with waste / box coverage
Inputs used
Area, Tile size, Waste percent, Box coverage, Price per square foot
Limitations
Results are estimates for quick planning and should be checked before important financial, legal, tax, health, or business decisions.
Last reviewed
May 25, 2026
Cite this page
Toolkit Shelf. Tile Calculator. Retrieved May 25, 2026, from https://toolkitshelf.com/tools/tile-calculator
FAQ
Common questions
How do I calculate how much tile I need?
Estimate the area in square feet, add a waste allowance, then divide by the area of one tile or by box coverage.
How much extra tile should I buy?
Many projects add 10% or more for cuts, breakage, layout matching, and future repairs.
Does this include grout or thinset?
No. This calculator estimates tile quantity and material cost only. Grout, thinset, underlayment, trim, and labor are separate.