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Tile Calculator

Estimate how many rectangular tiles you need from surface area, tile dimensions and a waste allowance. Get tile area and rounded quantity.

FreeNo sign-upInstant resultFormula shownInputs stay in your browser
Interactive calculatorEnter your values
Recalculates as you type
Tiles needed Live result
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Calculation breakdown
How to read this result

Use the result to compare scenarios and verify the inputs, units and real-world conditions before making an important decision.

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How to use it

A clear result in a few inputs.

  1. Enter the requested values.Use consistent units and the real values for your scenario.
  2. Read the main result and breakdown.NumLuma recalculates immediately when an input changes.
  3. Check the formula and assumptions.Use the supporting context before making a real-world decision.

What this calculator does

Tile quantity depends on both the area being covered and the face area of each tile. NumLuma converts tile dimensions from inches to square feet, estimates the exact tile count, applies your waste allowance and rounds the purchase quantity upward.

What to know before you use the result

  • Use the nominal face dimensions only if they match the coverage you intend to use.
  • Complex layouts and pattern matching can increase offcuts.
  • Whole-tile quantity is rounded upward after waste is applied.

Common mistakes to avoid

  • Mixing inches and feet without conversion.
  • Ignoring grout-joint or manufacturer coverage guidance when those affect layout.
  • Using one waste percentage for every pattern and room shape.
NLNumLuma standard

Built to be understandable before it is impressive.

  • Formula shown clearly
  • No sign-up required
  • Mobile-first controls
  • Inputs processed locally
  • Plain-language result breakdown
Read our methodology →
Assumptions & scope

Know what the number includes.

Evergreen project-planning intent. Keep units, material assumptions and waste/coverage limits explicit.

How NumLuma checks calculators →
Part of a curated toolkit

Home Project Calculators

Best for renovation planning, material estimates and quick quantity checks.

Explore the toolkit →
Learn the concept

How to Estimate Materials for Home Projects

A practical framework for measuring area and volume, adding waste, and turning project dimensions into material quantities.

Read guide →
Quick answers

About the tile calculation.

How is the number of tiles calculated?

The surface area is divided by the area of one tile, then multiplied by your waste allowance. The final purchase quantity is rounded up to a whole tile.

Should I include waste?

Usually yes for a real project, because cuts, breakage and pattern layout can consume extra pieces. The appropriate percentage depends on the installation.

Can I use this for wall tile?

Yes, as long as the surface area you enter is the area that will actually receive tile.

What if tiles are sold by the box?

Divide the required tile count by the number of tiles per box, or compare the total square footage with box coverage, then round up.