Tile Calculator

Estimate floor tiles, wastage-adjusted quantities, whole boxes and purchase cost with accurate upward rounding and metric or imperial dimensions.

Calculate your quantities

Runs in your browser

Results update as you edit. Use decimal points without commas. Costs use the same currency as your entered price.

Your estimate

Floor area: 20.0000m²
Floor area (imperial): 215.2782ft²
Tile area: 0.3600m²
Tile area (imperial): 3.8750ft²
Required tiles before wastage: 56tiles
Wastage-adjusted quantity: 62tiles
Required boxes: Not calculatedEnter tiles per box
Tiles in purchased boxes: Not calculatedEnter tiles per box
Estimated total cost: Not calculatedEnter the optional price to estimate cost

Display values are rounded; calculations and costs use unrounded quantities. Tile and box counts always round up. A “<” result is positive but smaller than the displayed decimal precision.

How to use Tile Calculator

Estimate tile and box quantities for a rectangular floor using the area of one tile. The allowance is applied to the unrounded area ratio, then whole tiles and whole boxes are rounded up separately. This keeps the purchase estimate distinct from the geometric area calculation.

Enter the measured dimensions and choose the unit beside each measurement. Quantities and counts must be positive whole numbers.
Adjust any wastage and coverage inputs to match your estimate. Leave optional prices blank if you only need quantities.
Review the results and assumptions below. Copy results includes labels and units; Reset defaults restores the starting example.

Calculation explanation

Formulas

Floor area = floor length × floor width; tile area = tile length × tile width
Required tiles = ceil(floor area ÷ tile area)
Wastage-adjusted tiles = ceil((floor area ÷ tile area) × (1 + wastage / 100))
Required boxes = ceil(wastage-adjusted tiles ÷ tiles per box)
Estimated cost = required boxes × price per box

Assumptions and measurement notes

ceil means round up to the next whole number. Wastage is applied before the first rounding, not to an already rounded tile count.
Actual cutting patterns, room shape, grout spacing and whether offcuts can be reused may change requirements. This is an area-based estimate, not a tile-layout plan.
Cost includes all tiles in whole purchased boxes. Enter tiles per box before entering a price per box.

Units are normalized before calculation: 1 in = 0.0254 m, 1 ft = 0.3048 m, 1 ft² = 0.09290304 m² and 1 ft³ = 0.028316846592 m³. Decimal arithmetic is retained through quantity rounding; dimensions and prices are limited to 1,000,000,000 per input.

Practical examples

A 5 × 4 m room

Input: 60 × 60 cm tiles; 10% wastage; 4 tiles per box; 25 per box
Result: Required tiles before wastage: 56 tiles; Wastage-adjusted quantity: 62 tiles; Required boxes: 16 boxes; Estimated total cost: 400.00 currency units

20 ÷ 0.36 gives 55.555… tiles. A 10% allowance requires 62 tiles, bought as 16 boxes containing 64 tiles.

A 12 × 10 ft floor

Input: 12 × 12 in tiles; 5% wastage; 10 tiles per box; 30 per box
Result: Required tiles before wastage: 120 tiles; Wastage-adjusted quantity: 126 tiles; Required boxes: 13 boxes; Estimated total cost: 390.00 currency units

The floor needs 120 tiles by area, or 126 with allowance. Thirteen whole boxes cost 390 currency units.

A 3 × 2 m utility floor

Input: 30 × 20 cm tiles; 0% wastage; box size and price omitted
Result: Floor area: 6.0000 m²; Tile area: 0.0600 m²; Wastage-adjusted quantity: 100 tiles

The exact area ratio is 6 ÷ 0.06 = 100. No extra tile is introduced by decimal arithmetic.

Frequently asked questions

What wastage percentage should I allow for floor tiles?

For standard square or rectangular tiles laid in a straight grid in square rooms, a 10% wastage allowance is standard to cover cutting offcuts and perimeter trimming. For diagonal herringbone layouts, large format tiles, or rooms with complex alcoves, allow 15% to 20%.

Why are tile quantities rounded up to whole boxes?

Floor and wall tiles are sold in sealed factory cartons to prevent breakage and guarantee matching production dye lots. The calculator rounds up to the next full box so you do not run short of matching tiles during installation.

Does this calculation account for grout joint spacing?

This calculator uses nominal tile dimensions. For small tiles (such as subway tiles), grout lines (3–5 mm) slightly reduce the overall tile count, but that minor difference is safely absorbed within your recommended cutting wastage allowance.