Fidamen

Tile Quantity Calculator

This Tile Quantity Calculator estimates the number of tiles, boxes, and the material cost required for a rectangular floor area. Enter measurements in metres and specify grout width in millimetres; the calculator accounts for grout spacing and a customizable waste allowance to cover cuts and breakage.

Results are conservative estimates for planning and purchasing. For complex room shapes, patterns, or steps, use this as a baseline and measure additional areas separately. For unit guidance and measurement standards, consult recommended references from national standards bodies and building science resources listed below.

Updated Nov 24, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record da58d589a070 • Reviewed by Fidamen Standards Committee

Inputs

Results

Updates as you type

Floor area (m²)

12

Tile coverage area including grout (m²)

0.0918

Tiles required (no waste)

130.7061

Tiles required (including waste)

—

Boxes needed

—

Estimated material cost

—

OutputValueUnit
Floor area (m²)12m²
Tile coverage area including grout (m²)0.0918m²
Tiles required (no waste)130.7061—
Tiles required (including waste)——
Boxes needed——
Estimated material cost——
Primary result12

Visualization

Methodology

We compute the floor area as length × width. Each tile's effective coverage equals (tile length + grout gap) × (tile width + grout gap); grout width is converted from millimetres to metres in the calculation.

Tiles required = floor area ÷ effective tile coverage. We then apply your waste percentage and round up to whole tiles and boxes because tiles are sold in whole units. Box quantity is the rounded-up tiles divided by tiles per box, rounded up again.

Cost is calculated from boxes needed × price per box. Values are estimates; always verify with on-site measurements before final purchase.

F.A.Q.

Can I enter dimensions in imperial units (feet/inches)?

This calculator expects metric inputs (metres for lengths, millimetres for grout). If you work in imperial units, convert to metres before entering values. NIST provides reliable unit-conversion guidance for accurate conversion.

How much waste percentage should I use?

Typical waste allowances range from 8% to 15% for straight layouts. Use higher values (10%–20%) for diagonal patterns, border cuts, or irregular rooms. For large format tiles or critical installations consult your installer or manufacturer recommendations.

Why does grout width change the number of tiles?

Grout creates spacing between tiles; the repeat pitch (tile size plus grout) determines how much floor area each tile covers. A wider grout increases the area consumed by spacing and can slightly reduce the number of tiles covering a given floor area.

How accurate is the cost estimate?

Cost is a simple multiplication of boxes needed by price per box. It does not include delivery, adhesive, grout, underlayment, labor, or waste on returned/exchanged boxes. Use the material cost here as a purchasing baseline and add quotes from suppliers and installers for full project budgeting.

What about irregular rooms, alcoves, or staircases?

Divide the project into rectangles or usable geometric sections, calculate each separately, then sum the tile quantities. For irregular shapes, measure and sketch the area, or consult a professional for templating to minimize waste.

Do building codes or safety standards affect tile quantity?

Quantity calculations are independent of most building codes, but codes and standards can affect tile selection (slip resistance, load rating) and installation methods. Refer to relevant local building codes and standards for compliance; consult an architect or licensed installer when in doubt.

Sources & citations

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: da58d589a070

What changed (latest)

v1.0.0 • 2025-11-24 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 24, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-24 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 9653bfaf4bb0