ProTileCalc

Bathroom Tile Calculator

Calculate total tile needed for a bathroom project. Add up your floor area and wall area, then subtract elements like doors or tubs to get your final estimate.

Enter your measurements

sq ft
sq ft
sq ft

Subtract area for doors (approx. 21 sq ft) or windows.

in
in
in
tiles

■ RESULT

Total tiles needed

79 tiles

Total area (with waste)159.9 sq ft
Boxes to buy10 boxes
Net room area139 sq ft
Formula: tiles = ⌈((floor + wall - subtract) ÷ effective_tile_area) × (1 + waste)⌉

Sources: TCNA Handbook

⚠ Estimate only. These calculations are based on industry-standard formulas and typical material specifications. Always verify quantities against product data sheets, manufacturer instructions, and your installer's recommendations before purchasing materials.

How to measure a bathroom for tile

Bathrooms are the most common but complex tiling projects because they involve multiple surfaces (floors, walls, shower surrounds) and many obstacles (doors, windows, vanities, toilets).

1. Measure the floor

Measure the length and width of the room in feet and multiply. Do not subtract for the toilet or vanity unless you are building a permanent, built-in cabinet. It's always best to tile under freestanding vanities to protect the subfloor and allow future renovations.

2. Measure the walls

Measure the perimeter of the room in feet. Multiply by the height you plan to tile. For a standard 8-foot ceiling, if you have a 25-foot perimeter and want tile wainscoting up to 4 feet, the area is 25 × 4 = 100 sq ft.

3. Subtract non-tiled areas

  • Standard door: Subtract 21 sq ft.
  • Standard window: Subtract 10–12 sq ft (measure to be sure).
  • Tub enclosure: If tiling around a tub, don't forget to subtract the area the tub occupies on the floor and wall.

Why use 15% waste?

Bathrooms require cuts around the toilet flange, shower drain, pipes, and multiple corners. This produces more waste than tiling a large, open room. 15% is the recommended minimum for bathrooms.

Frequently asked questions

Do I tile under the vanity?

Yes, it is highly recommended to tile under vanities. It protects the subfloor from water damage, creates a seamless look, and saves you from having to patch the floor if you ever replace the vanity with a different size.

Can I use the same tile on the floor and walls?

Usually, yes. Floor tiles can be used on walls. However, wall tiles cannot always be used on floors. Wall tile is often thinner and less durable (lower PEI rating). Always check the manufacturer's rating if you plan to put a tile on the floor.

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